From 73aa362d584ff43deebd1b5c7fba3038653cbb27 Mon Sep 17 00:00:00 2001
From: Sanjit Masanam <sanjitmasanam@gmail.com>
Date: Fri, 4 Oct 2024 14:35:11 -0700
Subject: [PATCH] Added the new reduced ldmx v2 geometry, modified the layer
 positions in EcalGeometry.py, and modified the layer weights in digi.py

Update digi.py

Update digi.py
---
 DetDescr/python/EcalGeometry.py               |   19 +-
 DetDescr/python/HcalGeometry.py               |    2 +-
 Detectors/data/ldmx-reduced-v2/constants.gdml |  471 ++++++
 Detectors/data/ldmx-reduced-v2/detector.gdml  |  215 +++
 Detectors/data/ldmx-reduced-v2/ecal.gdml      | 1297 ++++++++++++++
 .../ecal_motherboard5_assembly.gdml           |  286 ++++
 .../ecal_motherboard6_assembly.gdml           |  372 ++++
 .../ldmx-reduced-v2/ecal_support_box.gdml     | 1491 +++++++++++++++++
 Detectors/data/ldmx-reduced-v2/hcal.gdml      |  448 +++++
 Detectors/data/ldmx-reduced-v2/materials.gdml |   45 +
 Detectors/data/ldmx-reduced-v2/recoil.gdml    |  140 ++
 .../data/ldmx-reduced-v2/scoring_planes.gdml  |  363 ++++
 Detectors/data/ldmx-reduced-v2/tagger.gdml    |   89 +
 Detectors/data/ldmx-reduced-v2/target.gdml    |  112 ++
 .../data/ldmx-reduced-v2/trig_scint.gdml      |  109 ++
 Ecal/python/digi.py                           |   12 +
 16 files changed, 5467 insertions(+), 4 deletions(-)
 create mode 100644 Detectors/data/ldmx-reduced-v2/constants.gdml
 create mode 100644 Detectors/data/ldmx-reduced-v2/detector.gdml
 create mode 100644 Detectors/data/ldmx-reduced-v2/ecal.gdml
 create mode 100644 Detectors/data/ldmx-reduced-v2/ecal_motherboard5_assembly.gdml
 create mode 100644 Detectors/data/ldmx-reduced-v2/ecal_motherboard6_assembly.gdml
 create mode 100644 Detectors/data/ldmx-reduced-v2/ecal_support_box.gdml
 create mode 100644 Detectors/data/ldmx-reduced-v2/hcal.gdml
 create mode 100644 Detectors/data/ldmx-reduced-v2/materials.gdml
 create mode 100644 Detectors/data/ldmx-reduced-v2/recoil.gdml
 create mode 100644 Detectors/data/ldmx-reduced-v2/scoring_planes.gdml
 create mode 100644 Detectors/data/ldmx-reduced-v2/tagger.gdml
 create mode 100644 Detectors/data/ldmx-reduced-v2/target.gdml
 create mode 100644 Detectors/data/ldmx-reduced-v2/trig_scint.gdml

diff --git a/DetDescr/python/EcalGeometry.py b/DetDescr/python/EcalGeometry.py
index 589e434f1..ddddcb0ba 100644
--- a/DetDescr/python/EcalGeometry.py
+++ b/DetDescr/python/EcalGeometry.py
@@ -124,9 +124,8 @@ def v14() :
         eg.layer_shift_x = 2*eg.moduleMinR / eg.nCellRHeight
         return eg
         
-        
     def reduced() :
-        eg = EcalGeometry(detectors_valid = ["ldmx-reduced","ldmx-reduced[.].*"],
+        eg = EcalGeometry(detectors_valid = ["ldmx-reduced"],
                 gap = 1.5,
                 layerZPositions = [
                       7.932, 14.532, 32.146, 40.746, 58.110, 67.710
@@ -139,5 +138,19 @@ def reduced() :
         eg.layer_shift_x = 2*eg.moduleMinR / eg.nCellRHeight
         return eg
 
+    def reduced_v2() :
+        eg = EcalGeometry(detectors_valid = ["ldmx-reduced-v2"],
+                gap = 1.5,
+                layerZPositions = [
+                      9.932, 22.412, 40.81, 54.556, 71.954, 85.67
+                      ],
+                ecalFrontZ = 240.0,
+                cornersSideUp = True,
+                layer_shift_odd = True,
+                )
+        # shift by a single cell diameter
+        eg.layer_shift_x = 2*eg.moduleMinR / eg.nCellRHeight
+        return eg
+
     def geometries() :
-        return [EcalGeometry.v9(), EcalGeometry.v12(), EcalGeometry.v13(), EcalGeometry.v14(), EcalGeometry.reduced()]
+        return [EcalGeometry.v9(), EcalGeometry.v12(), EcalGeometry.v13(), EcalGeometry.v14(), EcalGeometry.reduced(), EcalGeometry.reduced_v2()]
diff --git a/DetDescr/python/HcalGeometry.py b/DetDescr/python/HcalGeometry.py
index 59aff9f7d..51c4b8c7a 100644
--- a/DetDescr/python/HcalGeometry.py
+++ b/DetDescr/python/HcalGeometry.py
@@ -487,5 +487,5 @@ def make_v14(self):
         ]
         # added the reduced geometry temporarily, for the final geometry
         # we should have a new function "reduced()" with the prototype geom
-        self.v14.detectors_valid = ["ldmx-det-v14", "ldmx-det-v14.*", "ldmx-reduced","ldmx-lyso-r1-v14", "ldmx-lyso-r1-v14.*"]
+        self.v14.detectors_valid = ["ldmx-det-v14", "ldmx-det-v14.*", "ldmx-reduced", "ldmx-reduced-v2","ldmx-lyso-r1-v14", "ldmx-lyso-r1-v14.*"]
         self.v14.y_offset = 19.05
diff --git a/Detectors/data/ldmx-reduced-v2/constants.gdml b/Detectors/data/ldmx-reduced-v2/constants.gdml
new file mode 100644
index 000000000..ce4ced272
--- /dev/null
+++ b/Detectors/data/ldmx-reduced-v2/constants.gdml
@@ -0,0 +1,471 @@
+<!-- Constant defining the clearance between volumes --> 
+<constant name="clearance" value="0.001*mm" />
+
+<!-- Define center position and identity rotation -->
+<position name="center"   x="0" y="0" z="0"/>
+<rotation name="identity" x="0" y="0" z="0"/>
+
+<!-- Dimensions of world volume -->
+<constant name="world_dim" value="12.0*m"/>
+
+<!-- 
+    Target
+--> 
+<!-- position -->
+<constant name="target_z" value="0.0*mm" />
+<!-- Tungsten X0 = .3504 cm.  Target thickeness = .1X0 -->
+<constant name="target_thickness" value="0.3504*mm" />
+<!-- Target dimensions -->
+<constant name="target_dim_x" value="4.0*cm"  />
+<constant name="target_dim_y" value="10.0*cm" />
+
+<!-- 
+    Magnet
+--> 
+
+<!-- Magnet is position such that the field center is at -40 cm. -->
+<constant name="magnet_pos_z" value="-40*cm" />
+
+<!-- Magnet gap dimensions --> 
+<constant name="magnet_gap_dx" value="430*mm"/>
+<constant name="magnet_gap_dy" value="350*mm"/>
+<constant name="magnet_gap_dz" value="1068*mm"/>
+
+<!--
+    Trigger Scintillator 
+--> 
+
+<!-- Trigger scintillator positions -->
+
+<constant name="trigger_pad_thickness"      value="4.5*mm" />
+<constant name="trigger_pad_bar_thickness"  value="2*mm" />
+<constant name="trigger_pad_bar_gap"        value="0.3*mm" />
+<constant name="trigger_pad_dim_x"          value="target_dim_x" />
+<constant name="trigger_pad_dim_y"          value="target_dim_y" />
+<constant name="trigger_bar_dx"             value="30"/>
+<constant name="trigger_bar_dy"             value="3.05"/>   
+<constant name="number_of_bars"             value="24"/>
+
+<constant name="trigger_pad_offset"    
+          value="(target_dim_y - (number_of_bars*trigger_bar_dy + (number_of_bars - 1)*trigger_pad_bar_gap))/2" />
+
+<!-- Trigger pad distance from the target is -2.4262 --> 
+<constant name="trig_scint_pad12_separation"
+          value="60"/>
+<constant name="trigger_pad1_z"
+          value="- trig_scint_pad12_separation - trigger_pad_thickness/2 - clearance" />
+<constant name="trigger_pad2_z"    
+          value="-(trigger_pad_thickness/2) - clearance" />
+<constant name="trigger_pad3_z"      
+          value="target_z - (target_thickness/2) - (trigger_pad_thickness/2) - clearance" />
+
+<!-- Parent volume dimensions --> 
+<constant name="trig_scint_area_envelope_x" value="magnet_gap_dx - 5" />
+<constant name="trig_scint_area_envelope_y" value="magnet_gap_dy - 5" />
+<constant name="trig_scint_area_envelope_z" 
+          value="-trigger_pad1_z + trigger_pad_thickness + 2*clearance"/>
+
+<!--
+  Tracker common variables 
+-->
+
+<!-- Stereo Angle = 100 mrad = 5.72 degrees -->
+<variable name="stereo_angle" value="5.72957795130823"/>
+
+<!-- HPS module and sensor dimensions -->
+<variable name="si_sensor_thickness" value="0.32*mm"/>
+<variable name="si_active_sensor_dx" value="38.3399*mm" />
+<variable name="si_active_sensor_dy" value="98.33*mm" />
+<variable name="si_sensor_dx" value="40.34*mm" />
+<variable name="si_sensor_dy" value="100.0*mm" />
+
+<!-- Large module and sensor dimensions --> 
+<variable name="si_large_active_sensor_dx" value="48*mm" />
+<variable name="si_large_active_sensor_dy" value="78*mm" />
+<variable name="si_large_sensor_dx" value="50*mm" />
+<variable name="si_large_sensor_dy" value="80*mm" />
+
+<!-- 
+  Clearance between the first/last sensor in the tagger tracker and the 
+  upstream/downstream faces of the tagger envelope.
+-->
+<variable name="tracker_envelope_clearance" value="3.5*mm" />
+
+<!-- 
+    Recoil tracker.
+-->
+
+<!-- Separation between sensors in a layer -->
+<constant name="recoil_l14_sensor_sep" value="3.0*mm"/>
+<constant name="recoil_l56_sensor_sep" value="1.0*mm"/>
+
+<!-- Seperation between layers --> 
+<constant name="recoil_delta_l14" value="15*mm" />
+<constant name="recoil_delta_l45" value="37*mm" />
+<constant name="recoil_delta_l56" value="90*mm" />
+
+<!-- Recoil envelope dimensions --> 
+<constant name="recoil_envelope_dx" value="magnet_gap_dx" />
+<constant name="recoil_envelope_dy" value="magnet_gap_dy" />
+<variable name="recoil_envelope_dz" 
+          value="tracker_envelope_clearance*2 + recoil_delta_l14*3 
+                 + recoil_delta_l45 + recoil_delta_l56" />
+ 
+<!--
+    Tagger Tracker 
+-->
+
+<!-- Seperation between sensors in a layer -->
+<variable name="tagger_layer_offset" value="3.0*mm"/>
+
+<!-- Seperation between layers --> 
+<variable name="tagger_layer_delta" value="100*mm" /> 
+
+<!-- Tagger envelope dimensions --> 
+<variable name="tagger_envelope_dx" value="magnet_gap_dx" />
+<variable name="tagger_envelope_dy" value="magnet_gap_dy" />
+<!-- 
+  The total length in z of the tagger envelope leaves 2.5 mm of clearance on
+  either side 
+-->
+<variable name="tagger_envelope_dz" 
+    value="tracker_envelope_clearance*2 + tagger_layer_delta*6" />
+
+
+<!--
+  Location of TS pads relative to target
+-->
+<variable name="ts_center_z"
+      value="-9 -tagger_envelope_dz -trig_scint_area_envelope_z/2 - clearance - 200" />
+<constant name="trigger_pad1_actual_z"
+    value="ts_center_z - (trig_scint_area_envelope_z/2 - trigger_pad_thickness/2) 
+            + trigger_pad_thickness/2" />
+<!-- 
+  somehow the pad thickness is double counted in the 
+  positioning of pad1, this accounts for that 
+-->
+<constant name="trigger_pad2_actual_z"
+    value="ts_center_z + (trig_scint_area_envelope_z/2 - trigger_pad_thickness/2)" />
+
+
+<!--
+   HCal
+  TODO:
+  - add Hcal case
+  - do airBoxes need to be added?
+--> 
+
+<!-- Common HCal components
+- Scintillator Thickness: oriented in z in back Hcal, y/x in side hcal
+- Scintillator Width: oriented in x/y in back Hcal
+-->
+
+<constant name="hcal_airThick" value="2."/>
+<constant name="hcal_scintThick" value="20."/> 
+<constant name="hcal_scintWidth" value="50."/> 
+
+<!-- Back HCal Layer component -->
+<constant name="back_hcal_numLayers" value="96"/>
+<constant name="back_hcal_numScint" value="40"/>
+<constant name="back_hcal_absoThick" value="25"/>
+<constant name="back_hcal_layerThick" 
+          value="back_hcal_absoThick + hcal_scintThick + 2.0*hcal_airThick"/>
+
+<!--
+  The back Hcal is 4704.mm long in z
+-->
+<constant name="back_hcal_dx" value="2000."/>
+<constant name="back_hcal_dy" value="2000."/>
+<constant name="back_hcal_dz" value="back_hcal_numLayers*back_hcal_layerThick"/>
+
+<!--
+  Side HCal Layer component 
+-->
+<constant name="side_hcal_absoThick" value="20."/>
+
+<!--
+  Length of bars oriented in z: side_hcal_dz
+  Side Hcal dz has to be greater than side Ecal dz
+-->
+<constant name="side_hcal_dz" value="600."/>
+
+<!--
+  Bars oriented in x (top or bottom)
+                in y (left or right)
+  Length varies.
+-->
+<variable name="side_hcal_numModules" value="4"/>
+<matrix name="side_hcal_length" coldim="1" values="1800.
+                                                   1600.
+                                                   1400.
+               1200."/>
+
+<!--
+  num bars per module:
+  oriented in z: 4*1800/50. + 3*1600/50.+2*1400/50. + 3*1200/50. = 368
+  oriented in x or y: 12
+  num of bars oriented in z: varies by number
+-->
+<matrix name="side_hcal_numLayers" coldim="1" values="4 3 2 3"/>
+<matrix name="side_hcal_numPrevLayers" coldim="1" values="0 4 7 9"/>
+<matrix name="side_hcal_numScintZ" coldim="1" values="side_hcal_length[1]/hcal_scintWidth
+                                                      side_hcal_length[2]/hcal_scintWidth
+                                                      side_hcal_length[3]/hcal_scintWidth
+                                                      side_hcal_length[4]/hcal_scintWidth"/>
+<variable name="side_hcal_numScintXY" value="side_hcal_dz/hcal_scintWidth"/>
+<variable name="side_hcal_numTotalLayers" 
+          value="(side_hcal_numLayers[1]+side_hcal_numLayers[2]
+                  +side_hcal_numLayers[3]+side_hcal_numLayers[4])*2"/>
+<variable name="side_hcal_layerThick" 
+          value="side_hcal_absoThick + 2.*hcal_airThick + hcal_scintThick"/>
+<variable name="side_hcal_moduleWidth" value="side_hcal_numTotalLayers*side_hcal_layerThick"/>
+<variable name="side_hcal_moduleLength" value="side_hcal_length[1]"/>
+<!--
+  Total calorimeter envelope
+  Width and height of the envelope for the side and back Hcal
+  Must be the maximum of back hcal dx and side hcal dx
+-->
+<constant name="hcal_envelope_dx" value="3000."/>
+<constant name="hcal_envelope_dy" value="3000."/>
+<constant name="hcal_envelope_dz" value="back_hcal_dz + side_hcal_dz"/>
+<constant name="hcal_dz" value="back_hcal_dz + side_hcal_dz"/>
+
+<!--
+    ECal 
+--> 
+
+<constant name="num_bilayers" value="3"/>
+
+<!-- 
+  ECal absorbing layer thicknesses 
+
+  The ECal is separated into five "sections" each of
+  which has a certain thickness for the tungsten at
+  the front of each bilayer and the tungsten next
+  to the cooling plane.
+
+  Section   | bilayers | Front | Cooling
+  Pre-Shower|        1 |   2.0 |     2.0 (x2)
+  Section A |        1 |   4.0 |     2.0 (x2)
+  Section B |        1 |   4.0 |     2.0 (x2)
+  Section C |        9 |   3.5 |     1.8 (NOT USED)
+  Section D |        5 |   7.0 |     3.5 (NOT USED)
+-->
+<matrix name="cooling_tungsten_dz"
+        coldim="1"
+        values="2.0
+                2.0
+                2.0
+                1.8
+                1.8
+                1.8
+                1.8
+                1.8
+                1.8
+                1.8
+                1.8
+                3.5
+                3.5
+                3.5
+                3.5
+                3.5"/>
+<matrix name="front_tungsten_dz"
+        coldim="1"
+        values="4.0
+                4.0
+                2.0
+                3.5
+                3.5
+                3.5
+                3.5
+                3.5
+                3.5
+                3.5
+                3.5
+                7.0
+                7.0
+                7.0
+                7.0
+                7.0"/>
+<!--
+The cumulative amount of absorber in front of the n'th bilayer.
+
+This is necessary for determining the z-positions of the layers
+within the placement loop. Unfortunately, one cannot use loops
+when defining GDML variables, so this needs to be precomputed.
+-->
+<matrix name="bilayer_absorber_cumulative"
+        coldim="1"
+        values="6.0
+                14.0
+                8.0
+                15.1
+                22.2
+                29.3
+                36.4
+                43.5
+                50.6
+                57.7
+                64.8
+                71.9
+                85.9
+                99.9
+                113.9
+                127.9
+                141.9"/>
+
+<!--
+The thickness of the strongback aluminum bar holding up the bilayer
+
+there are only two thicknesses but since it varies _at all_ across
+bilayers, we need to list them all explicitly so we can just reference
+them in the bilayer loop
+-->
+<matrix name="bilayer_strongback_thickness"
+        coldim="1"
+        values="12.7
+                12.7
+                25.4
+                25.4
+                25.4
+                25.4
+                25.4
+                25.4
+                25.4
+                25.4
+                25.4
+                25.4
+                25.4
+                25.4
+                25.4
+                25.4" />
+
+<!--
+The thickness of the pre-shower bilayer absorbers
+
+In v14, the pre-shower bilayer has no absorbers. However, 
+in the reduced geometry we are testing this possibility.
+-->
+
+<variable name="front_pre_tungsten_dz" value="2.0"/>
+<variable name="cooling_pre_tungsten_dz" value="2.0"/>
+
+<!--
+  Thickness of various components in the ECal layer stack
+    all values in mm
+
+  PCB_dz - needs to match the thickness of the PCB in the motherboards
+  extracted from CAD drawings. Leave it **larger** than the design
+  specifications by O(10)s of um for tolerance. This mismatch is
+  **on purpose**.
+-->
+<variable name="PCB_dz" value="1.666"/>
+<variable name="Glue_dz" value="0.1"/>
+<variable name="Si_dz" value="0.3"/>
+<variable name="GlueThick_dz" value="0.2"/>
+<variable name="CarbonBasePlate_dz" value="0.79"/>
+<!-- thickness of motherboard assembly, must match what is extracted -->
+<variable name="MotherBoardAssembly_dz" value="8.166"/>
+<!-- the carbon cooling plane is 1mm+3/16 inch thick (about) -->
+<variable name="CarbonCoolingPlane_dz" value="5.7"/>
+<variable name="CarbonCoolingPlane_dy" value="495.3"/>
+<variable name="CarbonCoolingPlane_dx" value="673.1"/>
+<!-- vertical dimension of the strong back bar -->
+<variable name="strongback_bar_dy" value="25.4"/>
+<variable name="strongback_bar_dx" value="838.2-0.6815"/>
+
+<!--
+  The thickness of the "flower" of sensitive hexagons 
+  In GDML-land, this is defined to be the hexagon PCB, glue,
+  sensitive silicon, and the thicker glue mounting it to the
+  absorber (or carbon cooling plane in the pre-shower case)
+-->
+<variable name="Flower_dz" value="PCB_dz+Glue_dz+Si_dz+GlueThick_dz+CarbonBasePlate_dz"/>
+
+<!-- 
+    Air separating sheets of Al or W with PCB motherboard, limited by 
+    construction abilities 
+-->
+<variable name="FrontTolerance" value="0.5"/> 
+<variable name="BackTolerance" value="0.5"/> 
+
+<!-- Air separting PCBs from PCB MotherBoards -->
+<variable name="PCB_Motherboard_Gap" value="3.5"/>
+
+<!--
+Thickness of the ECal bilayer stack NOT including the tungsten
+absorber layers which change thickness throughout the ECal
+
+This value is in mm
+-->
+<variable name="bilayer_noabsorber_thickness"
+          value="FrontTolerance + PCB_dz + PCB_Motherboard_Gap 
+                + Flower_dz + CarbonCoolingPlane_dz + Flower_dz
+                + PCB_Motherboard_Gap + PCB_dz + BackTolerance"/>
+
+<!-- constants -->
+<variable name="sqrt3" value="1.73205080757"/>
+
+<!-- transverse definitions 
+    hexagon_gap is the flat-to-flat gap between modules in mm
+    Hex_radius is the center-to-flat radius of one module in mm
+-->
+<variable name="hexagon_gap" value="1.5"/>
+<variable name="Hex_radius" value="85."/>
+
+<!--
+  This value was manually tweaked in order to get the correct
+  number and size of cells according to the CMS HGCal High Density
+  Hexaboard design. It should only be changed very carefully.
+-->
+<variable name="n_cellR_height" value="35.3"/>
+
+<!--
+  This geometry simply shifts the odd sensitive layers[1] by one
+  cell flat-to-flat diameter horizontally.
+
+  [1] i.e. The high-z flower half of each bilayer.
+-->
+<variable name="shift_x" value="2*Hex_radius/n_cellR_height"/>
+<variable name="shift_y" value="0."/>
+
+<!--
+  The support box is assymetric in the y-direction so everything
+  inside it needs to be shifted down by this amount and everything
+  outside of it needs to be shifted up by this amount.
+-->
+<variable name="support_box_shift" value="12.7*1.5" />
+
+<!-- 
+  ECal width and height 
+
+  This is calculated from the hexagon size and gaps between them
+  and is helpful for surrounding the ecal with scoring planes.
+-->
+<variable name="ECal_dx" value="Hex_radius*6. + hexagon_gap*2."/>
+<variable name="ECal_dy" value="Hex_radius*10./sqrt3 + sqrt3*hexagon_gap"/>
+
+<!-- 
+    Distance from target to the ECal parent volume.
+    The calorimeter is an additional .5 mm downstream at 240.5 mm.
+-->
+<constant name="ecal_front_z" value="24.0*cm"/>
+
+<!--
+  The cavern the ecal is in is larger than the actual ECal
+  to accomodate the support infrastructure.
+
+  These variables are used for defining geometry objects
+  that need to be separate from the ECal cavern (like the
+  side HCal).
+-->
+<variable name="ecal_side_dx" value="880.6815"/>
+<variable name="ecal_side_dy" value="600."/>
+
+<!-- 
+    Dimensions of ECal parent volume. The size is set to be 1 mm larger than 
+    the thickness of the ECal calculated above.
+--> 
+<constant name="ecal_envelope_x" value="ecal_side_dx" /> 
+<constant name="ecal_envelope_y" value="ecal_side_dy" /> 
+<constant name="ecal_envelope_z" value="600.0" /> 
diff --git a/Detectors/data/ldmx-reduced-v2/detector.gdml b/Detectors/data/ldmx-reduced-v2/detector.gdml
new file mode 100644
index 000000000..558557180
--- /dev/null
+++ b/Detectors/data/ldmx-reduced-v2/detector.gdml
@@ -0,0 +1,215 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE gdml [
+<!ENTITY constants SYSTEM "constants.gdml">
+<!ENTITY materials SYSTEM "materials.gdml">
+]>
+<gdml xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://service-spi.web.cern.ch/service-spi/app/releases/GDML/schema/gdml.xsd">
+
+  <define>
+
+    &constants;  
+
+    <!--
+      Position of the tagger and recoil tracker envelopes with respect to
+      target.  The 9 mm offset was chosen such that the midpoints of the 
+      last (first) layer of the tagger (recoil) tracker are 25 mm apart.
+    -->
+    <variable name="tagger_pos_z" value="-9*mm - tagger_envelope_dz/2" /> 
+    <variable name="recoil_pos_z" value="9*mm + recoil_envelope_dz/2"/>
+
+    <!-- Position of the ECal and HCal parent volumes -->
+    <constant name="em_calorimeter_pos_z" value="ecal_front_z" />
+    <constant name="hadron_calorimeter_pos_z" value="ecal_front_z + hcal_dz/2." />
+
+    <!--
+      Trigger scintillator parent volume position relative to the target
+      ???? mm. The end of the parent volume relative to the target
+      is at ?????. This gives a ???? mm clearance between the upstream.
+      There are now two TS modules upstream of the tagger tracker.
+    -->
+    <variable name="trig_scint_pos_z" 
+      value="tagger_pos_z-trig_scint_area_envelope_z/2 -tagger_envelope_dz/2- clearance - 200" />
+    
+    <!-- 
+         Define all subdetector positions relative to the target.  
+         Note: The position of the target is defined at the center i.e. 
+         x = y = z = 0 mm.     
+    -->
+    <position name="trig_scint_pos" x="0.0" y="0.0" z="trig_scint_pos_z"/>
+    <position name="tagger_pos" x="0.0" y="0.0" z="tagger_pos_z"/>
+    <position name="recoil_pos" x="0.0" y="0.0" z="recoil_pos_z"/>
+    <position name="em_calorimeter_pos"
+		  x="0.0" 
+		  y="support_box_shift"
+		  z="em_calorimeter_pos_z + ecal_envelope_z/2"/>
+    <!-- the ecal support box is asymmetric in the vertical direction causing an additional
+    shift relative to the origin at the target -->
+    <position name="hadron_calorimeter_pos"
+		  x="0.0" 
+		  y="support_box_shift"
+		  z="hadron_calorimeter_pos_z"/>
+    <position name="magnet_pos" x="0.0" y="0.0" z="magnet_pos_z" />
+	
+  </define>
+    
+  <materials>
+    &materials;
+  </materials>
+
+  <solids>
+    <box lunit="mm" name="world_box" x="world_dim" y="world_dim" z="world_dim"/>
+  </solids>
+    
+  <structure>
+    <volume name="World">
+      <materialref ref="Vacuum"/>
+      <solidref ref="world_box"/>
+      <physvol copynumber="1">
+        <file name="tagger.gdml"/>
+        <positionref ref="tagger_pos"/>
+        <rotationref ref="identity"/>
+      </physvol> 
+      <physvol copynumber="2">
+        <file name="target.gdml"  />
+        <positionref ref="center" />
+        <rotationref ref="identity"   /> 
+      </physvol> 
+      <physvol copynumber="3">
+        <file name="trig_scint.gdml"/>
+        <positionref ref="trig_scint_pos"/>
+        <rotationref ref="identity"/>
+      </physvol>
+      <physvol copynumber="5">
+        <file name="recoil.gdml"/>
+        <positionref ref="recoil_pos"/>
+        <rotationref ref="identity"/>
+      </physvol>
+      <physvol copynumber="6"> 
+        <file name="ecal.gdml"/> 
+        <positionref ref="em_calorimeter_pos"/> 
+        <rotationref ref="identity"/> 
+	    </physvol>
+      <physvol copynumber="7"> 
+        <file name="hcal.gdml"/> 
+        <positionref ref="hadron_calorimeter_pos"/> 
+        <rotationref ref="identity"/> 
+      </physvol>
+      <auxiliary auxtype="DetElem" auxvalue="Top"/>
+    </volume>
+  </structure>
+
+  <userinfo>
+    <!-- detector version -->
+    <auxiliary auxtype="DetectorVersion" auxvalue="1">
+      <auxiliary auxtype="DetectorName" auxvalue="ldmx-reduced-v2"/>
+      <auxiliary auxtype="Author" auxvalue="Tamas Vami, Sanjit Masanam"/>
+      <auxiliary auxtype="Description" 
+                 auxvalue="The reduced geometry for a 2025 summer running"/>
+    </auxiliary>
+
+    <!-- define regions -->
+    <auxiliary auxtype="Region" auxvalue="CalorimeterRegion">
+      <auxiliary auxtype="StoreTrajectories" auxvalue="false"/>
+    </auxiliary>   
+    <auxiliary auxtype="Region" auxvalue="MagnetRegion">
+      <auxiliary auxtype="StoreTrajectories" auxvalue="false"/>
+    </auxiliary>
+    <auxiliary auxtype="Region" auxvalue="tagger" >
+      <auxiliary auxtype="StoreTrajectories" auxvalue="true"/>
+    </auxiliary>
+    <auxiliary auxtype="Region" auxvalue="trig_scint" >
+      <auxiliary auxtype="StoreTrajectories" auxvalue="true"/>
+    </auxiliary>
+    <auxiliary auxtype="Region" auxvalue="target" >
+      <auxiliary auxtype="StoreTrajectories" auxvalue="true"/>
+    </auxiliary>
+
+    <!-- define vis attributes -->
+    <auxiliary auxtype="VisAttributes" auxvalue="InvisibleNoDau">
+      <auxiliary auxtype="DaughtersInvisible" auxvalue="true"/>
+      <auxiliary auxtype="Visible" auxvalue="false"/>
+    </auxiliary>  
+    <auxiliary auxtype="VisAttributes" auxvalue="InvisibleShowDau">
+      <auxiliary auxtype="DaughtersInvisible" auxvalue="false"/>
+      <auxiliary auxtype="Visible" auxvalue="false"/>
+    </auxiliary>  
+    <auxiliary auxtype="VisAttributes" auxvalue="NoDau">
+      <auxiliary auxtype="DaughtersInvisible" auxvalue="true"/>
+      <auxiliary auxtype="Visible" auxvalue="true"/>
+    </auxiliary>  
+    <auxiliary auxtype="VisAttributes" auxvalue="TargetVis">
+      <auxiliary auxtype="R" auxvalue="1.0"/>
+      <auxiliary auxtype="G" auxvalue="0.0"/>
+      <auxiliary auxtype="B" auxvalue="0.0"/>
+      <auxiliary auxtype="A" auxvalue="1.0"/>
+      <auxiliary auxtype="Style" auxvalue="solid"/>
+      <auxiliary auxtype="DaughtersInvisible" auxvalue="true"/>
+      <auxiliary auxtype="Visible" auxvalue="true"/>
+      <auxiliary auxtype="LineWidth" auxvalue="1.0"/>
+    </auxiliary>
+    <auxiliary auxtype="VisAttributes" auxvalue="EcalVis">
+      <auxiliary auxtype="R" auxvalue="0.6"/>
+      <auxiliary auxtype="G" auxvalue="0.6"/>
+      <auxiliary auxtype="B" auxvalue="0.6"/>
+      <auxiliary auxtype="A" auxvalue="1.0"/>
+      <auxiliary auxtype="Style" auxvalue="wireframe"/>
+      <auxiliary auxtype="DaughtersInvisible" auxvalue="false"/>
+      <auxiliary auxtype="Visible" auxvalue="true"/>
+      <auxiliary auxtype="LineWidth" auxvalue="1.0"/>
+    </auxiliary>  
+    <auxiliary auxtype="VisAttributes" auxvalue="HcalVis">
+      <auxiliary auxtype="R" auxvalue="0.6"/>
+      <auxiliary auxtype="G" auxvalue="0.3"/>
+      <auxiliary auxtype="B" auxvalue="0.0"/>
+      <auxiliary auxtype="A" auxvalue="1.0"/>
+      <auxiliary auxtype="Style" auxvalue="wireframe"/>
+      <auxiliary auxtype="DaughtersInvisible" auxvalue="false"/>
+      <auxiliary auxtype="Visible" auxvalue="true"/>
+      <auxiliary auxtype="LineWidth" auxvalue="1.0"/>
+    </auxiliary>
+    <auxiliary auxtype="VisAttributes" auxvalue="TaggerVis">
+      <auxiliary auxtype="R" auxvalue="0.8"/>
+      <auxiliary auxtype="G" auxvalue="0.8"/>
+      <auxiliary auxtype="B" auxvalue="0.0"/>
+      <auxiliary auxtype="A" auxvalue="1.0"/>
+      <auxiliary auxtype="Style" auxvalue="wireframe"/>
+      <auxiliary auxtype="DaughtersInvisible" auxvalue="false"/>
+      <auxiliary auxtype="Visible" auxvalue="true"/>
+      <auxiliary auxtype="LineWidth" auxvalue="1.0"/>
+    </auxiliary>
+    <auxiliary auxtype="VisAttributes" auxvalue="RecoilVis">
+      <auxiliary auxtype="R" auxvalue="0.6"/>
+      <auxiliary auxtype="G" auxvalue="0.6"/>
+      <auxiliary auxtype="B" auxvalue="0.0"/>
+      <auxiliary auxtype="A" auxvalue="1.0"/>
+      <auxiliary auxtype="Style" auxvalue="wireframe"/>
+      <auxiliary auxtype="DaughtersInvisible" auxvalue="false"/>
+      <auxiliary auxtype="Visible" auxvalue="true"/>
+      <auxiliary auxtype="LineWidth" auxvalue="1.0"/>
+    </auxiliary>
+    <auxiliary auxtype="VisAttributes" auxvalue="TriggerPadVis">
+      <auxiliary auxtype="R" auxvalue="0.9"/>
+      <auxiliary auxtype="G" auxvalue="0.8"/>
+      <auxiliary auxtype="B" auxvalue="1.0"/>
+      <auxiliary auxtype="A" auxvalue="1.0"/>
+      <auxiliary auxtype="Style" auxvalue="wireframe"/>
+      <auxiliary auxtype="DaughtersInvisible" auxvalue="true"/>
+      <auxiliary auxtype="Visible" auxvalue="true"/>
+      <auxiliary auxtype="LineWidth" auxvalue="1.0"/>
+    </auxiliary>
+    <auxiliary auxtype="VisAttributes" auxvalue="MagnetVis">
+      <auxiliary auxtype="R" auxvalue="0.75"/>
+      <auxiliary auxtype="G" auxvalue="0.75"/>
+      <auxiliary auxtype="B" auxvalue="0.75"/>
+      <auxiliary auxtype="A" auxvalue="0.8"/>
+      <auxiliary auxtype="Style" auxvalue="wireframe"/>
+      <auxiliary auxtype="DaughtersInvisible" auxvalue="false"/>
+      <auxiliary auxtype="Visible" auxvalue="false"/>
+      <auxiliary auxtype="LineWidth" auxvalue="1.0"/>
+    </auxiliary>  
+  </userinfo>  
+
+  <setup name="Default" version="1.0">
+    <world ref="World"/>
+  </setup>
+</gdml>
diff --git a/Detectors/data/ldmx-reduced-v2/ecal.gdml b/Detectors/data/ldmx-reduced-v2/ecal.gdml
new file mode 100644
index 000000000..93b9276c3
--- /dev/null
+++ b/Detectors/data/ldmx-reduced-v2/ecal.gdml
@@ -0,0 +1,1297 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no" ?>
+<!DOCTYPE gdml [
+<!ENTITY constants SYSTEM "constants.gdml">
+]>
+<gdml xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://service-spi.web.cern.ch/service-spi/app/releases/GDML/schema/gdml.xsd">
+
+  <!--
+    The LDMX ECal Geant4 Simulation Model
+
+    This file is defined in the same coordinate axes as the entire
+    detector (z = beam, x = horizontal left looking down beam, y = up).
+    But with the origin located at the front and center of the ECal itself.
+  -->
+
+  <define>
+
+    &constants;
+
+    <!--
+      The x,y vertices of the tungsten absorber polygon
+    -->
+    <matrix name="absorber_polygon"
+              coldim="2"
+              values="82.55 245.63
+                      171.45 194.31
+                      188.58 108.87
+                      254.00 51.33
+                      254.00 -51.33
+                      172.63 -99.67
+                      171.45 -194.31
+                      82.55 -245.63
+                      0.00 -217.75
+                      -82.55 -245.63
+                      -171.45 -194.31
+                      -172.63 -99.67
+                      -254.00 -51.33
+                      -254.00 51.33
+                      -188.58 108.87
+                      -171.45 194.31
+                      -82.55 245.63
+                      0.00 199.34"/>
+
+    <!--
+      The position of the support box
+
+      the support box is not symmetric in the vertical direction so
+      center on the central cavern with
+        y="-520.7/2.-support_box_shift"
+    -->
+    <position name="support_box_pos" unit="mm" 
+      x="-880.6815/2." 
+      y="-520.7/2.-support_box_shift"
+      z="-300-102.616"/>
+
+    <!--
+      The transverse position of the strongbacks.
+
+      The x-coordinate is centered with respect to the ecal envelope
+      while the y-coordinate is shifted 12.7mm above the cooling plane
+      which is how thick the shelf that they rest on is.
+    -->
+    <variable name="strongback_pos_x" value="1.8 + 0.6815/2." />
+    <variable name="strongback_pos_y" 
+      value="CarbonCoolingPlane_dy/2. + strongback_bar_dy/2. + 12.7/2."/>
+
+    <!--
+      The rotations and shifts putting the motherboards from their CAD exported coordinates into
+      ECal coordinates with the origin at the center of the layer.
+
+      The shifts are done _after_ the rotations.
+
+      The x-shift is done by finding the x-cooridnate of the top hexagonal point
+      of the motherboard and then lining that up with the top hexagonal point of the
+      flower.
+
+      The y-shift is found to center the hexagonal part of the motherboards on the flower.
+
+      The z-shift is just making sure that we are moving the whole volume centered on
+      itself.
+    -->
+    <rotation name="motherboard5_rotation" unit="deg" x="90" y="0" z="0"/>
+    <position name="motherboard5_position_rel_to_layer" unit="mm" 
+      x="-(Hex_radius+hexagon_gap)-(247.8682)"
+      y="-408.2065/2"
+      z="MotherBoardAssembly_dz/2"/>
+
+    <rotation name="motherboard6_rotation" unit="deg" x="90" y="180" z="0"/>
+    <position name="motherboard6_position_rel_to_layer" unit="mm" 
+      x="(Hex_radius+hexagon_gap)+(255.2361)"
+      y="242.1649"
+      z="MotherBoardAssembly_dz/2"/>
+
+    <!-- 
+    loop variables for bilayers and modules
+    -->
+    <variable name="bilayer" value="1"/>
+    <variable name="module" value="1"/>
+
+    <!-- inside the ecal parent volume, the coordinate system is relative to it,
+    so we need to subtract away half of its depth -->
+    <variable name="bilayer_start" value="-ecal_envelope_z/2."/>
+
+    <!-- extra air in pre-shower layer to make sure there is enough room between motehrboards
+    and cooling plane for the backplane boards -->
+    <variable name="preshower_extra_air" value="0.5"/>
+    <!-- additional offset for start of sampling sections because pre-shower
+              value="preshower_extra_air + 2*(MotherBoardAssembly_dz - PCB_dz)"/>
+        has extra air -->
+    <variable name="sampling_section_offset" 
+              value="2*preshower_extra_air"/>
+
+    <!-- flip over y-axis for odd-side of bilayer sandwich -->
+    <rotation name="flip" unit="deg" x="0" y="180" z="0"/>
+  </define>
+
+  <materials>
+    <!-- alimunum for support box -->
+    <material Z="13" name="G4_Al0x2705780" state="solid">
+      <T unit="K" value="293.15"/>
+      <MEE unit="eV" value="166"/>
+      <D unit="g/cm3" value="2.699"/>
+      <atom unit="g/mole" value="26.9815"/>
+    </material>
+
+    <!-- PCB mixture -->
+    <isotope N="63" Z="29" name="Cu630x271bbf0">
+      <atom unit="g/mole" value="62.9296"/>
+    </isotope>
+    <isotope N="65" Z="29" name="Cu650x271bc60">
+      <atom unit="g/mole" value="64.9278"/>
+    </isotope>
+    <element name="Cu0x271b990">
+      <fraction n="0.6917" ref="Cu630x271bbf0"/>
+      <fraction n="0.3083" ref="Cu650x271bc60"/>
+    </element>
+    <isotope N="16" Z="8" name="O160x271e090">
+      <atom unit="g/mole" value="15.9949"/>
+    </isotope>
+    <isotope N="17" Z="8" name="O170x271e400">
+      <atom unit="g/mole" value="16.9991"/>
+    </isotope>
+    <isotope N="18" Z="8" name="O180x271e490">
+      <atom unit="g/mole" value="17.9992"/>
+    </isotope>
+    <element name="O0x271e1a0">
+      <fraction n="0.99757" ref="O160x271e090"/>
+      <fraction n="0.00038" ref="O170x271e400"/>
+      <fraction n="0.00205" ref="O180x271e490"/>
+    </element>
+    <isotope N="23" Z="11" name="Na230x2725ef0">
+      <atom unit="g/mole" value="22.9898"/>
+    </isotope>
+    <element name="Na0x2725c90">
+      <fraction n="1" ref="Na230x2725ef0"/>
+    </element>
+    <isotope N="28" Z="14" name="Si280x271c4f0">
+      <atom unit="g/mole" value="27.9769"/>
+    </isotope>
+    <isotope N="29" Z="14" name="Si290x271c560">
+      <atom unit="g/mole" value="28.9765"/>
+    </isotope>
+    <isotope N="30" Z="14" name="Si300x271c5f0">
+      <atom unit="g/mole" value="29.9738"/>
+    </isotope>
+    <element name="Si0x271c2c0">
+      <fraction n="0.922296077703922" ref="Si280x271c4f0"/>
+      <fraction n="0.0468319531680468" ref="Si290x271c560"/>
+      <fraction n="0.0308719691280309" ref="Si300x271c5f0"/>
+    </element>
+    <isotope N="40" Z="20" name="Ca400x2726160">
+      <atom unit="g/mole" value="39.9626"/>
+    </isotope>
+    <isotope N="42" Z="20" name="Ca420x27261d0">
+      <atom unit="g/mole" value="41.9586"/>
+    </isotope>
+    <isotope N="43" Z="20" name="Ca430x2726240">
+      <atom unit="g/mole" value="42.9588"/>
+    </isotope>
+    <isotope N="44" Z="20" name="Ca440x27262e0">
+      <atom unit="g/mole" value="43.9555"/>
+    </isotope>
+    <isotope N="46" Z="20" name="Ca460x2726350">
+      <atom unit="g/mole" value="45.9537"/>
+    </isotope>
+    <isotope N="48" Z="20" name="Ca480x2726390">
+      <atom unit="g/mole" value="47.9525"/>
+    </isotope>
+    <element name="Ca0x2725f30">
+      <fraction n="0.96941" ref="Ca400x2726160"/>
+      <fraction n="0.00647" ref="Ca420x27261d0"/>
+      <fraction n="0.00135" ref="Ca430x2726240"/>
+      <fraction n="0.02086" ref="Ca440x27262e0"/>
+      <fraction n="4e-05" ref="Ca460x2726350"/>
+      <fraction n="0.00187" ref="Ca480x2726390"/>
+    </element>
+    <material name="FR40x27264f0" state="solid">
+      <T unit="K" value="293.15"/>
+      <MEE unit="eV" value="201.221278976803"/>
+      <D unit="g/cm3" value="5.68"/>
+      <fraction n="0.5" ref="Cu0x271b990"/>
+      <fraction n="0.22990022990023" ref="O0x271e1a0"/>
+      <fraction n="0.0482205482205482" ref="Na0x2725c90"/>
+      <fraction n="0.168276668276668" ref="Si0x271c2c0"/>
+      <fraction n="0.0536025536025536" ref="Ca0x2725f30"/>
+    </material>
+
+    <!-- glue mixture -->
+    <isotope N="12" Z="6" name="C120x271ddf0">
+      <atom unit="g/mole" value="12"/>
+    </isotope>
+    <isotope N="13" Z="6" name="C130x271de60">
+      <atom unit="g/mole" value="13.0034"/>
+    </isotope>
+    <element name="C0x271db90">
+      <fraction n="0.9893" ref="C120x271ddf0"/>
+      <fraction n="0.0107" ref="C130x271de60"/>
+    </element>
+    <isotope N="1" Z="1" name="H10x271f760">
+      <atom unit="g/mole" value="1.00782503081372"/>
+    </isotope>
+    <isotope N="2" Z="1" name="H20x271f7d0">
+      <atom unit="g/mole" value="2.01410199966617"/>
+    </isotope>
+    <element name="H0x271f530">
+      <fraction n="0.999885" ref="H10x271f760"/>
+      <fraction n="0.000115" ref="H20x271f7d0"/>
+    </element>
+    <material name="Glue0x272cce0" state="solid">
+      <T unit="K" value="293.15"/>
+      <MEE unit="eV" value="73.3297495741215"/>
+      <D unit="g/cm3" value="0.845"/>
+      <fraction n="0.84491305" ref="C0x271db90"/>
+      <fraction n="0.042542086" ref="H0x271f530"/>
+      <fraction n="0.11254487" ref="O0x271e1a0"/>
+    </material>
+
+    <!-- sensitive silicon -->
+    <material name="G4_Si0x271c1c0" state="solid">
+      <T unit="K" value="293.15"/>
+      <MEE unit="eV" value="173"/>
+      <D unit="g/cm3" value="2.33"/>
+      <fraction n="1" ref="Si0x271c2c0"/>
+    </material>
+
+    <!-- 
+    carbon+epoxy composite material for cooling plane 
+    
+    - taking the Epoxy mixture from the PDG values for
+      Epotek-301
+      https://pdg.lbl.gov/2022/AtomicNuclearProperties/HTML/Epotek-301-1.html
+    - the MEE value is pretty much made up at this point,
+      assuming it is the same as pure carbon which seems
+      to be an ok assumption since a majority of the epoxy
+      is carbon as well
+    - the epoxy to C-fiber ratio is 0.955 _by weight_
+
+    Fractions calculated by doing
+      C = 1+PDGFrac / 1.955
+      H = PDGFrac / 1.955
+      O = PDGFrac / 1.955
+      N = PDGFrac / 1.955
+    where PDGFrac is that material's mass fraction in the PDG
+    material linked above which we convert to molar fraction
+    by converting each fraction to moles individually and then
+    dividing by the sum.
+    -->
+    <material name="CarbonEpoxyComposite" state="solid">
+      <T unit="K" value="293.15"/>
+      <MEE unit="eV" value="81"/>
+      <D unit="g/cm3" value="1.439"/>
+      <fraction n="0.624883102" ref="C0x271db90"/>
+      <fraction n="0.308001109" ref="H0x271f530"/>
+      <fraction n="0.064281977" ref="O0x271e1a0"/>
+      <fraction n="0.002833811" ref="G4_AIR0x271da60"/><!--ref="N140x271e0d0"/>-->
+    </material>
+
+    <!-- air for gaps -->
+    <isotope N="14" Z="7" name="N140x271e0d0">
+      <atom unit="g/mole" value="14.0031"/>
+    </isotope>
+    <isotope N="15" Z="7" name="N150x271e140">
+      <atom unit="g/mole" value="15.0001"/>
+    </isotope>
+    <element name="N0x271dea0">
+      <fraction n="0.99632" ref="N140x271e0d0"/>
+      <fraction n="0.00368" ref="N150x271e140"/>
+    </element>
+    <isotope N="36" Z="18" name="Ar360x271e730">
+      <atom unit="g/mole" value="35.9675"/>
+    </isotope>
+    <isotope N="38" Z="18" name="Ar380x271e7c0">
+      <atom unit="g/mole" value="37.9627"/>
+    </isotope>
+    <isotope N="40" Z="18" name="Ar400x271e850">
+      <atom unit="g/mole" value="39.9624"/>
+    </isotope>
+    <element name="Ar0x271e500">
+      <fraction n="0.003365" ref="Ar360x271e730"/>
+      <fraction n="0.000632" ref="Ar380x271e7c0"/>
+      <fraction n="0.996003" ref="Ar400x271e850"/>
+    </element>
+    <material name="G4_AIR0x271da60" state="gas">
+      <T unit="K" value="293.15"/>
+      <MEE unit="eV" value="85.7"/>
+      <D unit="g/cm3" value="0.00120479"/>
+      <fraction n="0.000124000124000124" ref="C0x271db90"/>
+      <fraction n="0.755267755267755" ref="N0x271dea0"/>
+      <fraction n="0.231781231781232" ref="O0x271e1a0"/>
+      <fraction n="0.0128270128270128" ref="Ar0x271e500"/>
+    </material>
+
+    <!-- Tungsten for absorber -->
+    <isotope N="180" Z="74" name="W1800x270c100">
+      <atom unit="g/mole" value="179.947"/>
+    </isotope>
+    <isotope N="182" Z="74" name="W1820x270c170">
+      <atom unit="g/mole" value="181.948"/>
+    </isotope>
+    <isotope N="183" Z="74" name="W1830x270c210">
+      <atom unit="g/mole" value="182.95"/>
+    </isotope>
+    <isotope N="184" Z="74" name="W1840x270c2b0">
+      <atom unit="g/mole" value="183.951"/>
+    </isotope>
+    <isotope N="186" Z="74" name="W1860x270c2f0">
+      <atom unit="g/mole" value="185.954"/>
+    </isotope>
+    <element name="W0x270bea0">
+      <fraction n="0.0012" ref="W1800x270c100"/>
+      <fraction n="0.265" ref="W1820x270c170"/>
+      <fraction n="0.1431" ref="W1830x270c210"/>
+      <fraction n="0.3064" ref="W1840x270c2b0"/>
+      <fraction n="0.2843" ref="W1860x270c2f0"/>
+    </element>
+    <material name="G4_W0x270bda0" state="solid">
+      <T unit="K" value="293.15"/>
+      <MEE unit="eV" value="727"/>
+      <D unit="g/cm3" value="19.3"/>
+      <fraction n="1" ref="W0x270bea0"/>
+    </material>
+
+  </materials>
+
+  <solids>
+    <!--
+      Strongback Parts
+
+      The strong back consists of a bar of alimunum with "fins" hanging down from it
+      on either end to attach to the carbon cooling plane.
+
+      Not currently implementing the "fins" hanging down because its complicated
+    <box name="strongback_fin_rect" lunit="mm"
+         x="101.6-76.2" y="50.8" z="3.175" />
+    <xtru name="strongback_fin_triangle_left" lunit="mm">
+      <twoDimVertex x="0" y="0" />
+      <twoDimVertex x="0" y="-50.8" />
+      <twoDimVertex x="162.4-76.2" y="0" />
+      <section zOrder="0" zPosition="0" />
+      <section zOrder="1" zPosition="3.175" />
+    </xtru>
+    <xtru name="strongback_fin_triangle_right" lunit="mm">
+      <twoDimVertex x="0" y="0" />
+      <twoDimVertex x="0" y="-50.8" />
+      <twoDimVertex x="76.2-162.4" y="0" />
+      <section zOrder="0" zPosition="0" />
+      <section zOrder="1" zPosition="3.175" />
+    </xtru>
+    -->
+    <loop for="bilayer" from="1" to="num_bilayers" step="1">
+      <box name="strongback_bar[bilayer]" lunit="mm"
+           x="strongback_bar_dx" y="strongback_bar_dy" z="bilayer_strongback_thickness[bilayer]" />
+    </loop>
+        
+    <!--
+      The absorber layers have an interesting shape which basically outlines the ECal flower
+      with some areas of extra material for mounting onto the Carbon cooling layer
+
+      We construct this shape using an eXTRUded solid (xtru) where we draw the transverse
+      shape by provided the corners of the polygon in order around the solid and then defining
+      a single extrusion wich is NOT offset from the original z=0 plane.
+
+      The corners of the polygon are manually pulled from a CAD drawing of the engineering
+      design using some python nonsense to help filter out the unique points and sort them.
+      There are 18 corners.
+
+      The octagons are oriented so that the middle of a flat side is bisected by the x and y axes.
+    -->
+    <loop for="bilayer" from="1" to="num_bilayers" step="1">
+      <xtru name="W_front_absorber[bilayer]" lunit="mm">
+        <twoDimVertex x="absorber_polygon[1,1]" y="absorber_polygon[1,2]"/>
+        <twoDimVertex x="absorber_polygon[2,1]" y="absorber_polygon[2,2]"/>
+        <twoDimVertex x="absorber_polygon[3,1]" y="absorber_polygon[3,2]"/>
+        <twoDimVertex x="absorber_polygon[4,1]" y="absorber_polygon[4,2]"/>
+        <twoDimVertex x="absorber_polygon[5,1]" y="absorber_polygon[5,2]"/>
+        <twoDimVertex x="absorber_polygon[6,1]" y="absorber_polygon[6,2]"/>
+        <twoDimVertex x="absorber_polygon[7,1]" y="absorber_polygon[7,2]"/>
+        <twoDimVertex x="absorber_polygon[8,1]" y="absorber_polygon[8,2]"/>
+        <twoDimVertex x="absorber_polygon[9,1]" y="absorber_polygon[9,2]"/>
+        <twoDimVertex x="absorber_polygon[10,1]" y="absorber_polygon[10,2]"/>
+        <twoDimVertex x="absorber_polygon[11,1]" y="absorber_polygon[11,2]"/>
+        <twoDimVertex x="absorber_polygon[12,1]" y="absorber_polygon[12,2]"/>
+        <twoDimVertex x="absorber_polygon[13,1]" y="absorber_polygon[13,2]"/>
+        <twoDimVertex x="absorber_polygon[14,1]" y="absorber_polygon[14,2]"/>
+        <twoDimVertex x="absorber_polygon[15,1]" y="absorber_polygon[15,2]"/>
+        <twoDimVertex x="absorber_polygon[16,1]" y="absorber_polygon[16,2]"/>
+        <twoDimVertex x="absorber_polygon[17,1]" y="absorber_polygon[17,2]"/>
+        <twoDimVertex x="absorber_polygon[18,1]" y="absorber_polygon[18,2]"/>
+        <section zOrder="0" zPosition="0"/>
+        <section zOrder="1" zPosition="front_tungsten_dz[bilayer]"/>
+      </xtru>
+      <xtru name="W_cooling_absorber[bilayer]" lunit="mm">
+        <twoDimVertex x="absorber_polygon[1,1]" y="absorber_polygon[1,2]"/>
+        <twoDimVertex x="absorber_polygon[2,1]" y="absorber_polygon[2,2]"/>
+        <twoDimVertex x="absorber_polygon[3,1]" y="absorber_polygon[3,2]"/>
+        <twoDimVertex x="absorber_polygon[4,1]" y="absorber_polygon[4,2]"/>
+        <twoDimVertex x="absorber_polygon[5,1]" y="absorber_polygon[5,2]"/>
+        <twoDimVertex x="absorber_polygon[6,1]" y="absorber_polygon[6,2]"/>
+        <twoDimVertex x="absorber_polygon[7,1]" y="absorber_polygon[7,2]"/>
+        <twoDimVertex x="absorber_polygon[8,1]" y="absorber_polygon[8,2]"/>
+        <twoDimVertex x="absorber_polygon[9,1]" y="absorber_polygon[9,2]"/>
+        <twoDimVertex x="absorber_polygon[10,1]" y="absorber_polygon[10,2]"/>
+        <twoDimVertex x="absorber_polygon[11,1]" y="absorber_polygon[11,2]"/>
+        <twoDimVertex x="absorber_polygon[12,1]" y="absorber_polygon[12,2]"/>
+        <twoDimVertex x="absorber_polygon[13,1]" y="absorber_polygon[13,2]"/>
+        <twoDimVertex x="absorber_polygon[14,1]" y="absorber_polygon[14,2]"/>
+        <twoDimVertex x="absorber_polygon[15,1]" y="absorber_polygon[15,2]"/>
+        <twoDimVertex x="absorber_polygon[16,1]" y="absorber_polygon[16,2]"/>
+        <twoDimVertex x="absorber_polygon[17,1]" y="absorber_polygon[17,2]"/>
+        <twoDimVertex x="absorber_polygon[18,1]" y="absorber_polygon[18,2]"/>
+        <section zOrder="0" zPosition="0"/>
+        <section zOrder="1" zPosition="cooling_tungsten_dz[bilayer]"/>
+      </xtru>
+    </loop>
+
+    <!-- repeat above process for pre-shower absorbers -->
+    <xtru name="W_pre_front_absorber" lunit="mm">
+        <twoDimVertex x="absorber_polygon[1,1]" y="absorber_polygon[1,2]"/>
+        <twoDimVertex x="absorber_polygon[2,1]" y="absorber_polygon[2,2]"/>
+        <twoDimVertex x="absorber_polygon[3,1]" y="absorber_polygon[3,2]"/>
+        <twoDimVertex x="absorber_polygon[4,1]" y="absorber_polygon[4,2]"/>
+        <twoDimVertex x="absorber_polygon[5,1]" y="absorber_polygon[5,2]"/>
+        <twoDimVertex x="absorber_polygon[6,1]" y="absorber_polygon[6,2]"/>
+        <twoDimVertex x="absorber_polygon[7,1]" y="absorber_polygon[7,2]"/>
+        <twoDimVertex x="absorber_polygon[8,1]" y="absorber_polygon[8,2]"/>
+        <twoDimVertex x="absorber_polygon[9,1]" y="absorber_polygon[9,2]"/>
+        <twoDimVertex x="absorber_polygon[10,1]" y="absorber_polygon[10,2]"/>
+        <twoDimVertex x="absorber_polygon[11,1]" y="absorber_polygon[11,2]"/>
+        <twoDimVertex x="absorber_polygon[12,1]" y="absorber_polygon[12,2]"/>
+        <twoDimVertex x="absorber_polygon[13,1]" y="absorber_polygon[13,2]"/>
+        <twoDimVertex x="absorber_polygon[14,1]" y="absorber_polygon[14,2]"/>
+        <twoDimVertex x="absorber_polygon[15,1]" y="absorber_polygon[15,2]"/>
+        <twoDimVertex x="absorber_polygon[16,1]" y="absorber_polygon[16,2]"/>
+        <twoDimVertex x="absorber_polygon[17,1]" y="absorber_polygon[17,2]"/>
+        <twoDimVertex x="absorber_polygon[18,1]" y="absorber_polygon[18,2]"/>
+        <section zOrder="0" zPosition="0"/>
+        <section zOrder="1" zPosition="front_pre_tungsten_dz"/>
+      </xtru>
+      <xtru name="W_pre_cooling_absorber" lunit="mm">
+        <twoDimVertex x="absorber_polygon[1,1]" y="absorber_polygon[1,2]"/>
+        <twoDimVertex x="absorber_polygon[2,1]" y="absorber_polygon[2,2]"/>
+        <twoDimVertex x="absorber_polygon[3,1]" y="absorber_polygon[3,2]"/>
+        <twoDimVertex x="absorber_polygon[4,1]" y="absorber_polygon[4,2]"/>
+        <twoDimVertex x="absorber_polygon[5,1]" y="absorber_polygon[5,2]"/>
+        <twoDimVertex x="absorber_polygon[6,1]" y="absorber_polygon[6,2]"/>
+        <twoDimVertex x="absorber_polygon[7,1]" y="absorber_polygon[7,2]"/>
+        <twoDimVertex x="absorber_polygon[8,1]" y="absorber_polygon[8,2]"/>
+        <twoDimVertex x="absorber_polygon[9,1]" y="absorber_polygon[9,2]"/>
+        <twoDimVertex x="absorber_polygon[10,1]" y="absorber_polygon[10,2]"/>
+        <twoDimVertex x="absorber_polygon[11,1]" y="absorber_polygon[11,2]"/>
+        <twoDimVertex x="absorber_polygon[12,1]" y="absorber_polygon[12,2]"/>
+        <twoDimVertex x="absorber_polygon[13,1]" y="absorber_polygon[13,2]"/>
+        <twoDimVertex x="absorber_polygon[14,1]" y="absorber_polygon[14,2]"/>
+        <twoDimVertex x="absorber_polygon[15,1]" y="absorber_polygon[15,2]"/>
+        <twoDimVertex x="absorber_polygon[16,1]" y="absorber_polygon[16,2]"/>
+        <twoDimVertex x="absorber_polygon[17,1]" y="absorber_polygon[17,2]"/>
+        <twoDimVertex x="absorber_polygon[18,1]" y="absorber_polygon[18,2]"/>
+        <section zOrder="0" zPosition="0"/>
+        <section zOrder="1" zPosition="cooling_pre_tungsten_dz"/>
+      </xtru>
+
+    <!--
+      The carbon cooling layer spans the entire ECal box since it is the suport "curtain" for each
+      bi-layer. Right now, the CarbonCoolingPlane is modeled by a large rectangle filled with
+      a carbon+epoxy composite material.
+    -->
+    <box name="CarbonCoolingPlane" x="673.1" y="495.3" z="CarbonCoolingPlane_dz" lunit="mm" />
+
+    <!--
+      The sensitive hexagons stack
+
+      We model the hexaboards with five-layers:
+      1. The readout board made of PCB
+      2. Glue
+      3. The sensitive Silicon 
+      4. The glue holding the silicon to the hosting board
+      5. carbon fiber base plate
+    -->
+    <polyhedra aunit="deg" deltaphi="360" lunit="mm" name="PCB_hexagon" numsides="6" startphi="90">
+      <zplane rmax="Hex_radius" rmin="0" z="0"/>
+      <zplane rmax="Hex_radius" rmin="0" z="PCB_dz"/>
+    </polyhedra>
+
+    <polyhedra aunit="deg" deltaphi="360" lunit="mm" name="Glue_hexagon" numsides="6" startphi="90">
+      <zplane rmax="Hex_radius" rmin="0" z="0"/>
+      <zplane rmax="Hex_radius" rmin="0" z="Glue_dz"/>
+    </polyhedra>
+
+    <polyhedra aunit="deg" deltaphi="360" lunit="mm" name="Si_hexagon" numsides="6" startphi="90">
+      <zplane rmax="Hex_radius" rmin="0" z="0"/>
+      <zplane rmax="Hex_radius" rmin="0" z="Si_dz"/>
+    </polyhedra>
+
+    <polyhedra aunit="deg" deltaphi="360" lunit="mm" name="GlueThick_hexagon" numsides="6" startphi="90">
+      <zplane rmax="Hex_radius" rmin="0" z="0"/>
+      <zplane rmax="Hex_radius" rmin="0" z="GlueThick_dz"/>
+    </polyhedra>
+
+    <polyhedra aunit="deg" deltaphi="360" lunit="mm" name="CarbonBasePlate_hexagon" numsides="6" startphi="90">
+      <zplane rmax="Hex_radius" rmin="0" z="0"/>
+      <zplane rmax="Hex_radius" rmin="0" z="CarbonBasePlate_dz"/>
+    </polyhedra>
+
+    <!--
+      The ECal parent volume
+
+      We have a big box enclosing the ecal envelope and then we could add
+      some extra trapezoids that can cover the two "fins" of the support box.
+
+      For now, we are leaving the fins poking out of the ecal parent volume.
+      WARNING: This means they will be ignored by overlap checking.
+
+      <trd name="support_box_fin" x1= x2= y1= y2= z= />
+
+      <union name="support_box">
+        <first ref="ECal_box"/>
+        <second ref="support_box_fin"/>
+      </union>
+    -->
+    <box lunit="mm" name="ECal_box" x="ecal_envelope_x" y="ecal_envelope_y" z="ecal_envelope_z"/>
+  </solids>
+
+  <structure>
+    <!--
+      Support Volumes
+
+      This first section is defining some logical volumes
+      for use later in construction of the detector.
+    -->
+    <volume name="C_volume_CarbonCoolingPlane">
+      <materialref ref="CarbonEpoxyComposite"/>
+      <solidref ref="CarbonCoolingPlane"/>
+    </volume>
+
+    <assembly name="PCB_motherboard_volume">
+      <physvol>
+        <file name="ecal_motherboard5_assembly.gdml" />
+        <positionref ref="motherboard5_position_rel_to_layer" />
+        <rotationref ref="motherboard5_rotation" />
+      </physvol>
+      <physvol>
+        <file name="ecal_motherboard6_assembly.gdml" />
+        <positionref ref="motherboard6_position_rel_to_layer" />
+        <rotationref ref="motherboard6_rotation" />
+      </physvol>
+    </assembly>
+
+    <volume name="PCB_volume">
+      <materialref ref="FR40x27264f0"/>
+      <solidref ref="PCB_hexagon"/>
+    </volume>
+  
+    <volume name="Glue_volume">
+      <materialref ref="Glue0x272cce0"/>
+      <solidref ref="Glue_hexagon"/>
+    </volume>
+  
+    <volume name="Si_volume">
+      <materialref ref="G4_Si0x271c1c0"/>
+      <solidref ref="Si_hexagon"/>
+    </volume>
+  
+    <volume name="GlueThick_volume">
+      <materialref ref="Glue0x272cce0"/>
+      <solidref ref="GlueThick_hexagon"/>
+    </volume>
+
+    <volume name="CarbonBasePlate_volume">
+      <materialref ref="CarbonEpoxyComposite"/>
+      <solidref ref="CarbonBasePlate_hexagon"/>
+      <!--<auxiliary auxtype="VisAttributes" auxvalue="BlueSolid" />-->
+    </volume>
+
+    <!-- define the tungsten absorber volume corresponding to the correct-thickness solid -->
+    <loop for="bilayer" from="1" to="num_bilayers" step="1">
+      <volume name="strongback_bar_volume[bilayer]">
+        <materialref ref="G4_Al0x2705780" />
+        <solidref ref="strongback_bar[bilayer]" />
+      </volume>
+      <volume name="W_front_volume[bilayer]">
+        <materialref ref="G4_W0x270bda0"/>
+        <solidref ref="W_front_absorber[bilayer]"/>
+        <!--<auxiliary auxtype="VisAttributes" auxvalue="BlueSolid"/>-->
+      </volume>
+      <volume name="W_cooling_volume[bilayer]">
+        <materialref ref="G4_W0x270bda0"/>
+        <solidref ref="W_cooling_absorber[bilayer]"/>
+        <!--<auxiliary auxtype="VisAttributes" auxvalue="BlueSolid"/>-->
+      </volume>
+    </loop>
+
+    <!-- define the pre-shower tungsten absorber volumes -->
+    <volume name="W_pre_front_volume">
+      <materialref ref="G4_W0x270bda0"/>
+      <solidref ref="W_pre_front_absorber"/>
+      <!--<auxiliary auxtype="VisAttributes" auxvalue="BlueSolid"/>-->
+    </volume>
+
+    <volume name="W_pre_cooling_volume">
+      <materialref ref="G4_W0x270bda0"/>
+      <solidref ref="W_pre_cooling_absorber"/>
+      <!--<auxiliary auxtype="VisAttributes" auxvalue="BlueSolid"/>-->
+    </volume>
+
+    <!--
+      All of the physical volumes will be included as a child volume
+      of the 'em_calorimeters' logical volume.
+
+      The material layers that have a single shape per ECal layer
+      (e.g. carbon cooling plane, tungsten absorber, motherboard)
+      will be included in the CENTER STACK section while subsequent
+      sections for the ring of hexagons forming the "petals" of the
+      ECal flower will be put in after.
+
+      Each "bilayer sandwich" of the ECal is formed from the following
+      stack (in order of increasing z position). The only part that is
+      changing between different sections of the ECal is the thickness
+      of the absorber.
+
+                          Front Absorber
+                          Front Tolerance Gap
+                          Motherboard
+                          Motherboard Gap
+                      - - Hex PCB
+            Flower    |   Thin Glue
+            (even)    |   Sensitive Silicon
+                      |   Thick Glue
+                      - - Carbon Base Plate
+                          Cooling Absorber
+                          Carbon Cooling Plane
+                          Cooling Absorber
+                      - - Carbon Base Plate
+                      |   Thick Glue
+            Flower    |   Sensitive Silicon
+            (odd)     |   Thin Glue
+                      - - Hex PCB
+                          Motherboard Gap
+                          Motherboard
+                          Back Tolerance Gap
+    -->
+    <volume name="em_calorimeters">
+      <materialref ref="G4_AIR"/>
+      <solidref ref="ECal_box"/>
+
+      <!--
+        the support box is not symmetric in the vertical direction but
+        we center it at half its max y-coordinate because why not
+
+        Instead we could center on the central cavern with
+          y="-12.7-(520.7-12.7)/2."
+      -->
+      <physvol>
+        <file name="ecal_support_box.gdml"/>
+        <positionref ref="support_box_pos"/>
+      </physvol>
+
+      <!--
+        PRE-SHOWER LAYER
+
+        The pre-shower bilayer is designed in the same way as all of the other layers _except_
+        it has omitted all of the absorber layers.
+      -->
+      <physvol>
+        <volumeref ref="W_pre_front_volume"/>
+        <position name="W_pre_front_volume" unit="mm" x="0" y="-support_box_shift" 
+          z="bilayer_start"/>
+      </physvol>
+
+      <physvol>
+        <volumeref ref="PCB_motherboard_volume"/>
+        <position name="PCB_PS_motherboard_physvol0_pos" unit="mm" x="0" y="-support_box_shift" 
+          z="bilayer_start + front_pre_tungsten_dz + FrontTolerance + MotherBoardAssembly_dz/2."/>
+      </physvol>
+
+      <physvol>
+        <volumeref ref="PCB_volume"/>
+        <position name="PCB_volume_rel_to_hexaboard"
+          x="0" y="-support_box_shift" 
+          z="bilayer_start + front_pre_tungsten_dz + FrontTolerance + PCB_dz + PCB_Motherboard_Gap"/>
+      </physvol>
+      <physvol>
+        <volumeref ref="Glue_volume"/>
+        <position name="Glue_volume_rel_to_hexaboard"
+          x="0" y="-support_box_shift" 
+          z="bilayer_start + front_pre_tungsten_dz + FrontTolerance + PCB_dz + PCB_Motherboard_Gap + PCB_dz"/>
+      </physvol>
+      <physvol copynumber="7*0 + 0">
+        <volumeref ref="Si_volume"/>
+        <position name="Si_volume_rel_to_hexaboard"
+          x="0" y="-support_box_shift" 
+          z="bilayer_start + front_pre_tungsten_dz + FrontTolerance + PCB_dz + PCB_Motherboard_Gap + PCB_dz + Glue_dz"/>
+      </physvol>
+      <physvol>
+        <volumeref ref="GlueThick_volume"/>
+        <position name="GlueThick_volume_rel_to_hexaboard"
+          x="0" y="-support_box_shift" 
+          z="bilayer_start + front_pre_tungsten_dz + FrontTolerance + PCB_dz + PCB_Motherboard_Gap + PCB_dz + Glue_dz + Si_dz"/>
+      </physvol>
+      <physvol>
+        <volumeref ref="CarbonBasePlate_volume"/>
+        <position name="CarbonBasePlate_volume_rel_to_hexaboard"
+          x="0" y="-support_box_shift"
+          z="bilayer_start + front_pre_tungsten_dz + FrontTolerance + PCB_dz + PCB_Motherboard_Gap + PCB_dz + Glue_dz + Si_dz + GlueThick_dz"/>
+      </physvol>
+      <loop for="module" from="1" to="6" step="1">
+        <physvol>
+          <volumeref ref="PCB_volume"/>
+          <position name="PCB_volume_rel_to_hexaboard"
+            x="(2.*Hex_radius + hexagon_gap) * cos((module-1)*pi/3)" 
+            y="- support_box_shift - (2.*Hex_radius + hexagon_gap) * sin((module-1)*pi/3)" 
+            z="bilayer_start + front_pre_tungsten_dz + FrontTolerance + PCB_dz + PCB_Motherboard_Gap"/>
+        </physvol>
+        <physvol>
+          <volumeref ref="Glue_volume"/>
+          <position name="Glue_volume_rel_to_hexaboard"
+            x="(2.*Hex_radius + hexagon_gap) * cos((module-1)*pi/3)" 
+            y="- support_box_shift - (2.*Hex_radius + hexagon_gap) * sin((module-1)*pi/3)" 
+            z="bilayer_start + front_pre_tungsten_dz + FrontTolerance + PCB_dz + PCB_Motherboard_Gap + PCB_dz"/>
+        </physvol>
+        <physvol copynumber="7*0 + module">
+          <volumeref ref="Si_volume"/>
+          <position name="Si_volume_rel_to_hexaboard"
+            x="(2.*Hex_radius + hexagon_gap) * cos((module-1)*pi/3)" 
+            y="- support_box_shift - (2.*Hex_radius + hexagon_gap) * sin((module-1)*pi/3)" 
+            z="bilayer_start + front_pre_tungsten_dz + FrontTolerance + PCB_dz + PCB_Motherboard_Gap + PCB_dz + Glue_dz"/>
+        </physvol>
+        <physvol>
+          <volumeref ref="GlueThick_volume"/>
+          <position name="GlueThick_volume_rel_to_hexaboard"
+            x="(2.*Hex_radius + hexagon_gap) * cos((module-1)*pi/3)" 
+            y="- support_box_shift - (2.*Hex_radius + hexagon_gap) * sin((module-1)*pi/3)" 
+            z="bilayer_start + front_pre_tungsten_dz + FrontTolerance + PCB_dz + PCB_Motherboard_Gap + PCB_dz + Glue_dz + Si_dz"/>
+        </physvol>
+        <physvol>
+          <volumeref ref="CarbonBasePlate_volume"/>
+          <position name="CarbonBasePlate_volume_rel_to_hexaboard"
+            x="(2.*Hex_radius + hexagon_gap) * cos((module-1)*pi/3)" 
+            y="- support_box_shift - (2.*Hex_radius + hexagon_gap) * sin((module-1)*pi/3)" 
+            z="bilayer_start + front_pre_tungsten_dz + FrontTolerance + PCB_dz + PCB_Motherboard_Gap + PCB_dz + Glue_dz + Si_dz + GlueThick_dz"/>
+        </physvol>
+      </loop>
+
+      <physvol>
+        <volumeref ref="W_pre_cooling_volume"/>
+        <position name="W_pre_cooling_volume_pos" unit="mm" x="0" y="-support_box_shift" 
+          z="bilayer_start + front_pre_tungsten_dz + FrontTolerance + PCB_dz + PCB_Motherboard_Gap + Flower_dz"/>
+      </physvol>
+
+      <!-- 
+       center strong back bar over the center of the carbon cooling plane
+        and put it just above the carbon cooling plane
+       assume PreShower layer uses the same strongback as the first bilayer
+        with absorber
+      --> 
+      <physvol>
+        <volumeref ref="strongback_bar_volume_0"/>
+        <position name="strongback_bar_volume_PSpos" unit="mm" 
+          x="strongback_pos_x"
+          y="strongback_pos_y"
+          z="bilayer_start + front_pre_tungsten_dz + FrontTolerance + PCB_dz + PCB_Motherboard_Gap + Flower_dz 
+            + 2 + CarbonCoolingPlane_dz/2."/>
+      </physvol>
+      
+      <!--
+      Without the additional tungsten layer to allow for more longitudinal space,
+        the cooling plane is too close to the motherboard to allow room for the 
+        backplane boards and their connectors. Therefore, we need to move the cooling
+        plane in this pre-shower layer back by an additional 1.5mm.
+      -->
+      <physvol>
+        <volumeref ref="C_volume_CarbonCoolingPlane"/>
+        <position name="PS_carbon_pos" unit="mm" x="0" y="-support_box_shift" 
+          z="bilayer_start + front_pre_tungsten_dz + FrontTolerance + PCB_dz + PCB_Motherboard_Gap + Flower_dz 
+            + preshower_extra_air + 2 + CarbonCoolingPlane_dz/2."/>
+      </physvol>
+
+      <physvol>
+        <volumeref ref="W_pre_cooling_volume"/>
+        <position name="W_pre_cooling_volume_pos" unit="mm" 
+          x="shift_x" y="shift_y-support_box_shift" 
+          z="bilayer_start + front_pre_tungsten_dz + FrontTolerance + PCB_dz + PCB_Motherboard_Gap + Flower_dz 
+            + preshower_extra_air + 2 + CarbonCoolingPlane_dz"/>
+      </physvol>
+
+      <physvol>
+        <volumeref ref="CarbonBasePlate_volume"/>
+        <position name="CarbonBasePlate_volume_PS_pos1_0"
+          x="shift_x" y="shift_y-support_box_shift" 
+          z="bilayer_start + front_pre_tungsten_dz + FrontTolerance + PCB_dz + PCB_Motherboard_Gap + Flower_dz 
+            + preshower_extra_air + cooling_pre_tungsten_dz + CarbonCoolingPlane_dz + cooling_pre_tungsten_dz"/>
+      </physvol>
+      <physvol>
+        <volumeref ref="GlueThick_volume"/>
+        <position name="GlueThick_volume_PS_pos1_0"
+          x="shift_x" y="shift_y-support_box_shift" 
+          z="bilayer_start + front_pre_tungsten_dz + FrontTolerance + PCB_dz + PCB_Motherboard_Gap + Flower_dz 
+            + preshower_extra_air + cooling_pre_tungsten_dz + CarbonCoolingPlane_dz + cooling_pre_tungsten_dz + CarbonBasePlate_dz"/>
+      </physvol>
+      <physvol copynumber="7*1 + 0">
+        <volumeref ref="Si_volume"/>
+        <position name="Si_volume_rel_to_hexaboard"
+          x="shift_x" y="shift_y-support_box_shift" 
+          z="bilayer_start + front_pre_tungsten_dz + FrontTolerance + PCB_dz + PCB_Motherboard_Gap + Flower_dz 
+            + preshower_extra_air + cooling_pre_tungsten_dz + CarbonCoolingPlane_dz + cooling_pre_tungsten_dz + CarbonBasePlate_dz + GlueThick_dz"/>
+      </physvol>
+      <physvol>
+        <volumeref ref="Glue_volume"/>
+        <position name="Glue_volume_rel_to_hexaboard"
+          x="shift_x" y="shift_y-support_box_shift" 
+          z="bilayer_start + front_pre_tungsten_dz + FrontTolerance + PCB_dz + PCB_Motherboard_Gap + Flower_dz 
+            + preshower_extra_air + cooling_pre_tungsten_dz + CarbonCoolingPlane_dz + cooling_pre_tungsten_dz + CarbonBasePlate_dz + GlueThick_dz + Si_dz"/>
+      </physvol>
+      <physvol>
+        <volumeref ref="PCB_volume"/>
+        <position name="PS_flower_pos1"
+          x="shift_x" y="shift_y-support_box_shift" 
+          z="bilayer_start + front_pre_tungsten_dz + FrontTolerance + PCB_dz + PCB_Motherboard_Gap + Flower_dz 
+            + preshower_extra_air + cooling_pre_tungsten_dz + CarbonCoolingPlane_dz + cooling_pre_tungsten_dz + CarbonBasePlate_dz + GlueThick_dz + Si_dz + Glue_dz"/>
+      </physvol>
+      <loop for="module" from="1" to="6" step="1">
+        <physvol>
+          <volumeref ref="CarbonBasePlate_volume"/>
+          <position name="CarbonBasePlate_volume_PS_pos1_0"
+            x="shift_x + (2.*Hex_radius + hexagon_gap) * cos((module-1)*pi/3)" 
+            y="shift_y - support_box_shift - (2.*Hex_radius + hexagon_gap) * sin((module-1)*pi/3)" 
+            z="bilayer_start + front_pre_tungsten_dz + FrontTolerance + PCB_dz + PCB_Motherboard_Gap + Flower_dz 
+              + preshower_extra_air + cooling_pre_tungsten_dz + CarbonCoolingPlane_dz + cooling_pre_tungsten_dz"/>
+        </physvol>
+        <physvol>
+          <volumeref ref="GlueThick_volume"/>
+          <position name="GlueThick_volume_PS_pos1_0"
+            x="shift_x + (2.*Hex_radius + hexagon_gap) * cos((module-1)*pi/3)" 
+            y="shift_y - support_box_shift - (2.*Hex_radius + hexagon_gap) * sin((module-1)*pi/3)" 
+            z="bilayer_start + front_pre_tungsten_dz + FrontTolerance + PCB_dz + PCB_Motherboard_Gap + Flower_dz 
+              + preshower_extra_air + cooling_pre_tungsten_dz + CarbonCoolingPlane_dz + cooling_pre_tungsten_dz + CarbonBasePlate_dz"/>
+        </physvol>
+        <physvol copynumber="7*1 + module">
+          <volumeref ref="Si_volume"/>
+          <position name="Si_volume_rel_to_hexaboard"
+            x="shift_x + (2.*Hex_radius + hexagon_gap) * cos((module-1)*pi/3)" 
+            y="shift_y - support_box_shift - (2.*Hex_radius + hexagon_gap) * sin((module-1)*pi/3)" 
+            z="bilayer_start + front_pre_tungsten_dz + FrontTolerance + PCB_dz + PCB_Motherboard_Gap + Flower_dz 
+              + preshower_extra_air + cooling_pre_tungsten_dz + CarbonCoolingPlane_dz + cooling_pre_tungsten_dz + CarbonBasePlate_dz + GlueThick_dz"/>
+        </physvol>
+        <physvol>
+          <volumeref ref="Glue_volume"/>
+          <position name="Glue_volume_rel_to_hexaboard"
+            x="shift_x + (2.*Hex_radius + hexagon_gap) * cos((module-1)*pi/3)" 
+            y="shift_y - support_box_shift - (2.*Hex_radius + hexagon_gap) * sin((module-1)*pi/3)" 
+            z="bilayer_start + front_pre_tungsten_dz + FrontTolerance + PCB_dz + PCB_Motherboard_Gap + Flower_dz 
+              + preshower_extra_air + cooling_pre_tungsten_dz + CarbonCoolingPlane_dz + cooling_pre_tungsten_dz + CarbonBasePlate_dz + GlueThick_dz + Si_dz"/>
+        </physvol>
+        <physvol>
+          <volumeref ref="PCB_volume"/>
+          <position name="PS_flower_pos1"
+            x="shift_x + (2.*Hex_radius + hexagon_gap) * cos((module-1)*pi/3)" 
+            y="shift_y - support_box_shift - (2.*Hex_radius + hexagon_gap) * sin((module-1)*pi/3)" 
+            z="bilayer_start + front_pre_tungsten_dz + FrontTolerance + PCB_dz + PCB_Motherboard_Gap + Flower_dz 
+              + preshower_extra_air + cooling_pre_tungsten_dz + CarbonCoolingPlane_dz + cooling_pre_tungsten_dz + CarbonBasePlate_dz + GlueThick_dz + Si_dz + Glue_dz"/>
+        </physvol>
+      </loop>
+
+      <physvol>
+        <volumeref ref="PCB_motherboard_volume"/>
+        <rotationref ref="flip"/>
+        <position name="PCB_PS_motherboard_pos1" unit="mm" x="0" y="-support_box_shift" 
+          z="bilayer_start + front_pre_tungsten_dz + FrontTolerance + PCB_dz + PCB_Motherboard_Gap + Flower_dz 
+            + preshower_extra_air + cooling_pre_tungsten_dz + CarbonCoolingPlane_dz + cooling_pre_tungsten_dz + Flower_dz + PCB_Motherboard_Gap 
+            + preshower_extra_air + PCB_dz - MotherBoardAssembly_dz/2."/>
+      </physvol>
+
+      <!-- 
+        Sampling Sections 
+
+        We start the index at one because GDML goes up to the INCLUDE the number
+        specified by 'to' and the PreShower bilayer above is what uses the bilayer
+        number 0.
+      -->
+      <loop for="bilayer" from="1" to="num_bilayers-1" step="1">
+        <physvol>
+          <volumeref ref="W_front_volume[bilayer]"/>
+          <position name="W_front_volume[bilayer]" unit="mm" x="0" y="-support_box_shift" 
+            z="bilayer_start + sampling_section_offset
+              + bilayer_noabsorber_thickness*bilayer
+              + bilayer_absorber_cumulative[bilayer]
+              + BackTolerance"/>
+        </physvol>
+
+        <physvol>
+          <volumeref ref="PCB_motherboard_volume"/>
+          <position name="PCB_motherboard_pos0[bilayer]" unit="mm" x="0" y="-support_box_shift" 
+            z="bilayer_start + sampling_section_offset
+              + bilayer_noabsorber_thickness*bilayer
+              + bilayer_absorber_cumulative[bilayer]
+              + BackTolerance + front_tungsten_dz[bilayer] + FrontTolerance
+              + MotherBoardAssembly_dz/2."/>
+        </physvol>
+
+        <physvol>
+          <volumeref ref="PCB_volume"/>
+          <position name="PCB_volume_rel_to_hexaboard"
+            x="0" y="-support_box_shift" 
+            z="bilayer_start + sampling_section_offset
+              + bilayer_noabsorber_thickness*bilayer 
+              + bilayer_absorber_cumulative[bilayer]
+              + BackTolerance
+              + front_tungsten_dz[bilayer] + FrontTolerance 
+              + PCB_dz + PCB_Motherboard_Gap"/>
+        </physvol>
+        <physvol>
+          <volumeref ref="Glue_volume"/>
+          <position name="Glue_volume_rel_to_hexaboard"
+            x="0" y="-support_box_shift" 
+            z="bilayer_start + sampling_section_offset
+              + bilayer_noabsorber_thickness*bilayer 
+              + bilayer_absorber_cumulative[bilayer]
+              + BackTolerance
+              + front_tungsten_dz[bilayer] + FrontTolerance 
+              + PCB_dz + PCB_Motherboard_Gap + PCB_dz"/>
+        </physvol>
+        <physvol copynumber="7*(2*bilayer) + 0">
+          <volumeref ref="Si_volume"/>
+          <position name="Si_volume_rel_to_hexaboard"
+            x="0" y="-support_box_shift" 
+            z="bilayer_start + sampling_section_offset
+              + bilayer_noabsorber_thickness*bilayer 
+              + bilayer_absorber_cumulative[bilayer]
+              + BackTolerance
+              + front_tungsten_dz[bilayer] + FrontTolerance 
+              + PCB_dz + PCB_Motherboard_Gap + PCB_dz + Glue_dz"/>
+        </physvol>
+        <physvol>
+          <volumeref ref="GlueThick_volume"/>
+          <position name="GlueThick_volume_rel_to_hexaboard"
+            x="0" y="-support_box_shift" 
+            z="bilayer_start + sampling_section_offset
+              + bilayer_noabsorber_thickness*bilayer 
+              + bilayer_absorber_cumulative[bilayer]
+              + BackTolerance
+              + front_tungsten_dz[bilayer] + FrontTolerance 
+              + PCB_dz + PCB_Motherboard_Gap + PCB_dz + Glue_dz + Si_dz"/>
+        </physvol>
+        <physvol>
+          <volumeref ref="CarbonBasePlate_volume"/>
+          <position name="CarbonBasePlate_volume_rel_to_hexaboard"
+            x="0" y="-support_box_shift" 
+            z="bilayer_start + sampling_section_offset
+              + bilayer_noabsorber_thickness*bilayer 
+              + bilayer_absorber_cumulative[bilayer]
+              + BackTolerance
+              + front_tungsten_dz[bilayer] + FrontTolerance 
+              + PCB_dz + PCB_Motherboard_Gap + PCB_dz + Glue_dz + Si_dz + GlueThick_dz"/>
+        </physvol>
+        <loop for="module" from="1" to="6" step="1">
+          <physvol>
+            <volumeref ref="PCB_volume"/>
+            <position name="PCB_volume_rel_to_hexaboard"
+              x="(2.*Hex_radius + hexagon_gap) * cos((module-1)*pi/3)" 
+              y="- support_box_shift - (2.*Hex_radius + hexagon_gap) * sin((module-1)*pi/3)" 
+            z="bilayer_start + sampling_section_offset
+              + bilayer_noabsorber_thickness*bilayer 
+              + bilayer_absorber_cumulative[bilayer]
+              + BackTolerance
+              + front_tungsten_dz[bilayer] + FrontTolerance 
+              + PCB_dz + PCB_Motherboard_Gap"/>
+          </physvol>
+          <physvol>
+            <volumeref ref="Glue_volume"/>
+            <position name="Glue_volume_rel_to_hexaboard"
+              x="(2.*Hex_radius + hexagon_gap) * cos((module-1)*pi/3)" 
+              y="- support_box_shift - (2.*Hex_radius + hexagon_gap) * sin((module-1)*pi/3)" 
+            z="bilayer_start + sampling_section_offset
+              + bilayer_noabsorber_thickness*bilayer 
+              + bilayer_absorber_cumulative[bilayer]
+              + BackTolerance
+              + front_tungsten_dz[bilayer] + FrontTolerance 
+              + PCB_dz + PCB_Motherboard_Gap + PCB_dz"/>
+          </physvol>
+          <physvol copynumber="7*(2*bilayer) + module">
+            <volumeref ref="Si_volume"/>
+            <position name="Si_volume_even_pos[bilayer][module]"
+              x="(2.*Hex_radius + hexagon_gap) * cos((module-1)*pi/3)" 
+              y="- support_box_shift - (2.*Hex_radius + hexagon_gap) * sin((module-1)*pi/3)" 
+            z="bilayer_start + sampling_section_offset
+              + bilayer_noabsorber_thickness*bilayer 
+              + bilayer_absorber_cumulative[bilayer]
+              + BackTolerance
+              + front_tungsten_dz[bilayer] + FrontTolerance 
+              + PCB_dz + PCB_Motherboard_Gap + PCB_dz + Glue_dz"/>
+          </physvol>
+          <physvol>
+            <volumeref ref="GlueThick_volume"/>
+            <position name="GlueThick_volume_even_pos[bilayer][module]"
+              x="(2.*Hex_radius + hexagon_gap) * cos((module-1)*pi/3)" 
+              y="- support_box_shift - (2.*Hex_radius + hexagon_gap) * sin((module-1)*pi/3)" 
+            z="bilayer_start + sampling_section_offset
+              + bilayer_noabsorber_thickness*bilayer 
+              + bilayer_absorber_cumulative[bilayer]
+              + BackTolerance
+              + front_tungsten_dz[bilayer] + FrontTolerance 
+              + PCB_dz + PCB_Motherboard_Gap + PCB_dz + Glue_dz + Si_dz"/>
+          </physvol>
+          <physvol>
+            <volumeref ref="CarbonBasePlate_volume"/>
+            <position name="CarbonBasePlate_volume_even_pos[bilayer][module]"
+              x="(2.*Hex_radius + hexagon_gap) * cos((module-1)*pi/3)" 
+              y="- support_box_shift - (2.*Hex_radius + hexagon_gap) * sin((module-1)*pi/3)" 
+            z="bilayer_start + sampling_section_offset
+              + bilayer_noabsorber_thickness*bilayer 
+              + bilayer_absorber_cumulative[bilayer]
+              + BackTolerance
+              + front_tungsten_dz[bilayer] + FrontTolerance 
+              + PCB_dz + PCB_Motherboard_Gap + PCB_dz + Glue_dz + Si_dz + GlueThick_dz"/>
+          </physvol>
+        </loop>
+
+        <physvol>
+          <volumeref ref="W_cooling_volume[bilayer]"/>
+          <position name="W_cooling_volume_pos0[bilayer]" unit="mm" x="0" y="-support_box_shift" 
+            z="bilayer_start + sampling_section_offset
+              + bilayer_noabsorber_thickness*bilayer
+              + bilayer_absorber_cumulative[bilayer]
+              + BackTolerance
+              + front_tungsten_dz[bilayer] + FrontTolerance 
+              + PCB_dz + PCB_Motherboard_Gap + Flower_dz"/>
+        </physvol>
+
+        <!-- 
+         center strong back bar over the center of the carbon cooling plane
+          and put it just above the carbon cooling plane
+        --> 
+        <physvol>
+          <volumeref ref="strongback_bar_volume[bilayer]"/>
+          <position name="strongback_bar_volume_pos[bilayer]" unit="mm"
+            x="strongback_pos_x"
+            y="strongback_pos_y"
+            z="bilayer_start + sampling_section_offset
+              + bilayer_noabsorber_thickness*bilayer
+              + bilayer_absorber_cumulative[bilayer]
+              + BackTolerance
+              + front_tungsten_dz[bilayer] + FrontTolerance 
+              + PCB_dz + PCB_Motherboard_Gap + Flower_dz
+              + cooling_tungsten_dz[bilayer] + CarbonCoolingPlane_dz/2."/>
+        </physvol>
+
+        <physvol>
+          <volumeref ref="C_volume_CarbonCoolingPlane"/>
+          <position name="carbon_pos[bilayer]" unit="mm" x="0" y="-support_box_shift" 
+            z="bilayer_start + sampling_section_offset
+              + bilayer_noabsorber_thickness*bilayer
+              + bilayer_absorber_cumulative[bilayer]
+              + BackTolerance
+              + front_tungsten_dz[bilayer] + FrontTolerance 
+              + PCB_dz + PCB_Motherboard_Gap + Flower_dz
+              + cooling_tungsten_dz[bilayer] + CarbonCoolingPlane_dz/2."/>
+        </physvol>
+  
+        <physvol>
+          <volumeref ref="W_cooling_volume[bilayer]"/>
+          <position name="W_cooling_volume_pos1[bilayer]" unit="mm" 
+            x="shift_x" y="shift_y-support_box_shift" 
+            z="bilayer_start + sampling_section_offset
+              + bilayer_noabsorber_thickness*bilayer 
+              + bilayer_absorber_cumulative[bilayer]
+              + BackTolerance
+              + front_tungsten_dz[bilayer] + FrontTolerance 
+              + PCB_dz + PCB_Motherboard_Gap + Flower_dz
+              + cooling_tungsten_dz[bilayer] + CarbonCoolingPlane_dz"/>
+        </physvol>
+  
+        <physvol>
+          <volumeref ref="CarbonBasePlate_volume"/>
+          <position name="CarbonBasePlate_volume_odd_pos0[bilayer]"
+            x="shift_x" y="shift_y-support_box_shift" 
+            z="bilayer_start + sampling_section_offset
+              + bilayer_noabsorber_thickness*bilayer
+              + bilayer_absorber_cumulative[bilayer]
+              + BackTolerance
+              + front_tungsten_dz[bilayer] + FrontTolerance 
+              + PCB_dz + PCB_Motherboard_Gap + Flower_dz
+              + cooling_tungsten_dz[bilayer] + CarbonCoolingPlane_dz + cooling_tungsten_dz[bilayer]"/>
+        </physvol>
+        <physvol>
+          <volumeref ref="GlueThick_volume"/>
+          <position name="GlueThick_volume_odd_pos0[bilayer]"
+            x="shift_x" y="shift_y-support_box_shift" 
+            z="bilayer_start + sampling_section_offset
+              + bilayer_noabsorber_thickness*bilayer
+              + bilayer_absorber_cumulative[bilayer]
+              + BackTolerance
+              + front_tungsten_dz[bilayer] + FrontTolerance 
+              + PCB_dz + PCB_Motherboard_Gap + Flower_dz
+              + cooling_tungsten_dz[bilayer] + CarbonCoolingPlane_dz + cooling_tungsten_dz[bilayer]
+              + CarbonBasePlate_dz"/>
+        </physvol>
+        <physvol copynumber="7*(2*bilayer + 1) + 0">
+          <volumeref ref="Si_volume"/>
+          <position name="Si_volume_odd_pos0[bilayer]"
+            x="shift_x" y="shift_y-support_box_shift" 
+            z="bilayer_start + sampling_section_offset
+              + bilayer_noabsorber_thickness*bilayer
+              + bilayer_absorber_cumulative[bilayer]
+              + BackTolerance
+              + front_tungsten_dz[bilayer] + FrontTolerance 
+              + PCB_dz + PCB_Motherboard_Gap + Flower_dz
+              + cooling_tungsten_dz[bilayer] + CarbonCoolingPlane_dz + cooling_tungsten_dz[bilayer]
+              + CarbonBasePlate_dz + GlueThick_dz"/>
+        </physvol>
+        <physvol>
+          <volumeref ref="Glue_volume"/>
+          <position name="Glue_volume_odd_pos0[bilayer]"
+            x="shift_x" y="shift_y-support_box_shift" 
+            z="bilayer_start + sampling_section_offset
+              + bilayer_noabsorber_thickness*bilayer
+              + bilayer_absorber_cumulative[bilayer]
+              + BackTolerance
+              + front_tungsten_dz[bilayer] + FrontTolerance 
+              + PCB_dz + PCB_Motherboard_Gap + Flower_dz
+              + cooling_tungsten_dz[bilayer] + CarbonCoolingPlane_dz + cooling_tungsten_dz[bilayer]
+              + CarbonBasePlate_dz + GlueThick_dz + Si_dz"/>
+        </physvol>
+        <physvol>
+          <volumeref ref="PCB_volume"/>
+          <position name="PCB_volume_odd_pos0[bilayer]"
+            x="shift_x" y="shift_y-support_box_shift" 
+            z="bilayer_start + sampling_section_offset
+              + bilayer_noabsorber_thickness*bilayer
+              + bilayer_absorber_cumulative[bilayer]
+              + BackTolerance
+              + front_tungsten_dz[bilayer] + FrontTolerance 
+              + PCB_dz + PCB_Motherboard_Gap + Flower_dz
+              + cooling_tungsten_dz[bilayer] + CarbonCoolingPlane_dz + cooling_tungsten_dz[bilayer]
+              + CarbonBasePlate_dz + GlueThick_dz + Si_dz + Glue_dz"/>
+        </physvol>
+        <loop for="module" from="1" to="6" step="1">
+          <physvol>
+            <volumeref ref="CarbonBasePlate_volume"/>
+            <position name="CarbonBasePlate_volume_odd[bilayer][module]"
+              x="shift_x + (2.*Hex_radius + hexagon_gap) * cos((module-1)*pi/3)" 
+              y="shift_y - support_box_shift - (2.*Hex_radius + hexagon_gap) * sin((module-1)*pi/3)" 
+              z="bilayer_start + sampling_section_offset
+                + bilayer_noabsorber_thickness*bilayer
+                + bilayer_absorber_cumulative[bilayer]
+                + BackTolerance
+                + front_tungsten_dz[bilayer] + FrontTolerance 
+                + PCB_dz + PCB_Motherboard_Gap + Flower_dz
+                + cooling_tungsten_dz[bilayer] + CarbonCoolingPlane_dz + cooling_tungsten_dz[bilayer]" />
+          </physvol>
+          <physvol>
+            <volumeref ref="GlueThick_volume"/>
+            <position name="GlueThick_volume_odd[bilayer][module]"
+              x="shift_x + (2.*Hex_radius + hexagon_gap) * cos((module-1)*pi/3)" 
+              y="shift_y - support_box_shift - (2.*Hex_radius + hexagon_gap) * sin((module-1)*pi/3)" 
+              z="bilayer_start + sampling_section_offset
+                + bilayer_noabsorber_thickness*bilayer
+                + bilayer_absorber_cumulative[bilayer]
+                + BackTolerance
+                + front_tungsten_dz[bilayer] + FrontTolerance 
+                + PCB_dz + PCB_Motherboard_Gap + Flower_dz
+                + cooling_tungsten_dz[bilayer] + CarbonCoolingPlane_dz + cooling_tungsten_dz[bilayer]
+                + CarbonBasePlate_dz"/>
+          </physvol>
+          <physvol copynumber="7*(2*bilayer + 1) + module">
+            <volumeref ref="Si_volume"/>
+            <position name="Si_volume_odd_pos[bilayer][module]"
+              x="shift_x + (2.*Hex_radius + hexagon_gap) * cos((module-1)*pi/3)" 
+              y="shift_y - support_box_shift - (2.*Hex_radius + hexagon_gap) * sin((module-1)*pi/3)" 
+              z="bilayer_start + sampling_section_offset
+                + bilayer_noabsorber_thickness*bilayer
+                + bilayer_absorber_cumulative[bilayer]
+                + BackTolerance
+                + front_tungsten_dz[bilayer] + FrontTolerance 
+                + PCB_dz + PCB_Motherboard_Gap + Flower_dz
+                + cooling_tungsten_dz[bilayer] + CarbonCoolingPlane_dz + cooling_tungsten_dz[bilayer]
+                + CarbonBasePlate_dz + GlueThick_dz" />
+          </physvol>
+          <physvol>
+            <volumeref ref="Glue_volume"/>
+            <position name="Glue_volume_odd_pos[bilayer][module]"
+              x="shift_x + (2.*Hex_radius + hexagon_gap) * cos((module-1)*pi/3)" 
+              y="shift_y - support_box_shift - (2.*Hex_radius + hexagon_gap) * sin((module-1)*pi/3)" 
+              z="bilayer_start + sampling_section_offset
+                + bilayer_noabsorber_thickness*bilayer
+                + bilayer_absorber_cumulative[bilayer]
+                + BackTolerance
+                + front_tungsten_dz[bilayer] + FrontTolerance 
+                + PCB_dz + PCB_Motherboard_Gap + Flower_dz
+                + cooling_tungsten_dz[bilayer] + CarbonCoolingPlane_dz + cooling_tungsten_dz[bilayer]
+                + CarbonBasePlate_dz + GlueThick_dz + Si_dz" />
+          </physvol>
+          <physvol>
+            <volumeref ref="PCB_volume"/>
+            <position name="PCB_volume_odd_pos[bilayer][module]"
+              x="shift_x + (2.*Hex_radius + hexagon_gap) * cos((module-1)*pi/3)" 
+              y="shift_y - support_box_shift - (2.*Hex_radius + hexagon_gap) * sin((module-1)*pi/3)" 
+              z="bilayer_start + sampling_section_offset
+                + bilayer_noabsorber_thickness*bilayer
+                + bilayer_absorber_cumulative[bilayer]
+                + BackTolerance
+                + front_tungsten_dz[bilayer] + FrontTolerance 
+                + PCB_dz + PCB_Motherboard_Gap + Flower_dz
+                + cooling_tungsten_dz[bilayer] + CarbonCoolingPlane_dz + cooling_tungsten_dz[bilayer]
+                + CarbonBasePlate_dz + GlueThick_dz + Si_dz + Glue_dz"/>
+          </physvol>
+        </loop>
+  
+        <physvol>
+          <volumeref ref="PCB_motherboard_volume"/>
+          <rotationref ref="flip"/>
+          <position name="PCB_motherboard_pos1[bilayer]" unit="mm" 
+            x="shift_x" y="shift_y - support_box_shift" 
+            z="bilayer_start + sampling_section_offset
+              + bilayer_noabsorber_thickness*bilayer
+              + bilayer_absorber_cumulative[bilayer]
+              + BackTolerance
+              + front_tungsten_dz[bilayer] + FrontTolerance 
+              + PCB_dz + PCB_Motherboard_Gap + Flower_dz
+              + cooling_tungsten_dz[bilayer] + CarbonCoolingPlane_dz + cooling_tungsten_dz[bilayer] 
+              + Flower_dz + PCB_Motherboard_Gap +PCB_dz - MotherBoardAssembly_dz/2."/>
+        </physvol>
+      </loop>
+
+      <auxiliary auxtype="Region" auxvalue="CalorimeterRegion"/>
+          <!--<auxiliary auxtype="VisAttributes" auxvalue="GrayWireFrame"/>-->
+      <auxiliary auxtype="DetElem" auxvalue="Ecal"/>
+    </volume>
+  </structure>
+
+  <setup name="Default" version="1.0">
+    <world ref="em_calorimeters"/>
+  </setup>
+
+  <userinfo>
+    <!-- define vis attributes
+    -->
+    <auxiliary auxtype="VisAttributes" auxvalue="GrayWireFrame">
+      <auxiliary auxtype="R" auxvalue="0.6"/>
+      <auxiliary auxtype="G" auxvalue="0.6"/>
+      <auxiliary auxtype="B" auxvalue="0.6"/>
+      <auxiliary auxtype="A" auxvalue="1.0"/>
+      <auxiliary auxtype="Style" auxvalue="wireframe"/>
+      <auxiliary auxtype="DaughtersInvisible" auxvalue="false"/>
+      <auxiliary auxtype="Visible" auxvalue="true"/>
+      <auxiliary auxtype="LineWidth" auxvalue="1.0"/>
+    </auxiliary>
+    <auxiliary auxtype="VisAttributes" auxvalue="BlueWireFrame">
+      <auxiliary auxtype="R" auxvalue="0.0"/>
+      <auxiliary auxtype="G" auxvalue="0.0"/>
+      <auxiliary auxtype="B" auxvalue="1.0"/>
+      <auxiliary auxtype="A" auxvalue="1.0"/>
+      <auxiliary auxtype="Style" auxvalue="wireframe"/>
+      <auxiliary auxtype="DaughtersInvisible" auxvalue="false"/>
+      <auxiliary auxtype="Visible" auxvalue="true"/>
+      <auxiliary auxtype="LineWidth" auxvalue="1.0"/>
+    </auxiliary>
+    <auxiliary auxtype="VisAttributes" auxvalue="BlueSolid">
+      <auxiliary auxtype="R" auxvalue="0.0"/>
+      <auxiliary auxtype="G" auxvalue="0.0"/>
+      <auxiliary auxtype="B" auxvalue="1.0"/>
+      <auxiliary auxtype="A" auxvalue="0.4"/>
+      <auxiliary auxtype="Style" auxvalue="solid"/>
+      <auxiliary auxtype="DaughtersInvisible" auxvalue="false"/>
+      <auxiliary auxtype="Visible" auxvalue="true"/>
+      <auxiliary auxtype="LineWidth" auxvalue="1.0"/>
+    </auxiliary>
+    <auxiliary auxtype="VisAttributes" auxvalue="Invisible">
+      <auxiliary auxtype="R" auxvalue="0.0"/>
+      <auxiliary auxtype="G" auxvalue="0.0"/>
+      <auxiliary auxtype="B" auxvalue="1.0"/>
+      <auxiliary auxtype="A" auxvalue="0.4"/>
+      <auxiliary auxtype="Style" auxvalue="solid"/>
+      <auxiliary auxtype="DaughtersInvisible" auxvalue="false"/>
+      <auxiliary auxtype="Visible" auxvalue="false"/>
+      <auxiliary auxtype="LineWidth" auxvalue="1.0"/>
+    </auxiliary> 
+  </userinfo>  
+
+</gdml>
diff --git a/Detectors/data/ldmx-reduced-v2/ecal_motherboard5_assembly.gdml b/Detectors/data/ldmx-reduced-v2/ecal_motherboard5_assembly.gdml
new file mode 100644
index 000000000..f06730b67
--- /dev/null
+++ b/Detectors/data/ldmx-reduced-v2/ecal_motherboard5_assembly.gdml
@@ -0,0 +1,286 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no" ?>
+<gdml xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://service-spi.web.cern.ch/service-spi/app/releases/GDML/schema/gdml.xsd">
+
+  <define>
+    <position name="nohole_motherboard5_assembly_v0" unit="mm" x="197.0682" y="8.166" z="380.9181"/>
+    <position name="nohole_motherboard5_assembly_v1" unit="mm" x="97.69203" y="8.166" z="437.1063"/>
+    <position name="nohole_motherboard5_assembly_v2" unit="mm" x="197.0682" y="6.666" z="380.9181"/>
+    <position name="nohole_motherboard5_assembly_v3" unit="mm" x="97.69203" y="6.666" z="437.1063"/>
+    <position name="nohole_motherboard5_assembly_v4" unit="mm" x="247.8682" y="8.166" z="410.2475"/>
+    <position name="nohole_motherboard5_assembly_v5" unit="mm" x="247.8682" y="6.666" z="410.2475"/>
+    <position name="nohole_motherboard5_assembly_v6" unit="mm" x="298.6682" y="8.166" z="380.9181"/>
+    <position name="nohole_motherboard5_assembly_v7" unit="mm" x="298.6682" y="6.666" z="380.9181"/>
+    <position name="nohole_motherboard5_assembly_v8" unit="mm" x="298.6682" y="8.166" z="322.2594"/>
+    <position name="nohole_motherboard5_assembly_v9" unit="mm" x="298.6682" y="6.666" z="322.2594"/>
+    <position name="nohole_motherboard5_assembly_v10" unit="mm" x="247.8682" y="8.166" z="292.93"/>
+    <position name="nohole_motherboard5_assembly_v11" unit="mm" x="247.8682" y="6.666" z="292.93"/>
+    <position name="nohole_motherboard5_assembly_v12" unit="mm" x="214.6958" y="8.166" z="235.4737"/>
+    <position name="nohole_motherboard5_assembly_v13" unit="mm" x="214.6958" y="6.666" z="235.4737"/>
+    <position name="nohole_motherboard5_assembly_v14" unit="mm" x="214.6958" y="8.166" z="176.8149"/>
+    <position name="nohole_motherboard5_assembly_v15" unit="mm" x="214.6958" y="6.666" z="176.8149"/>
+    <position name="nohole_motherboard5_assembly_v16" unit="mm" x="247.8682" y="8.166" z="119.3586"/>
+    <position name="nohole_motherboard5_assembly_v17" unit="mm" x="247.8682" y="6.666" z="119.3586"/>
+    <position name="nohole_motherboard5_assembly_v18" unit="mm" x="298.6682" y="8.166" z="90.02922"/>
+    <position name="nohole_motherboard5_assembly_v19" unit="mm" x="298.6682" y="6.666" z="90.02922"/>
+    <position name="nohole_motherboard5_assembly_v20" unit="mm" x="298.6682" y="8.166" z="31.37043"/>
+    <position name="nohole_motherboard5_assembly_v21" unit="mm" x="298.6682" y="6.666" z="31.37043"/>
+    <position name="nohole_motherboard5_assembly_v22" unit="mm" x="247.8682" y="8.166" z="2.041042"/>
+    <position name="nohole_motherboard5_assembly_v23" unit="mm" x="247.8682" y="6.666" z="2.041042"/>
+    <position name="nohole_motherboard5_assembly_v24" unit="mm" x="197.0682" y="8.166" z="31.37043"/>
+    <position name="nohole_motherboard5_assembly_v25" unit="mm" x="197.0682" y="6.666" z="31.37043"/>
+    <position name="nohole_motherboard5_assembly_v26" unit="mm" x="197.0682" y="8.166" z="90.02922"/>
+    <position name="nohole_motherboard5_assembly_v27" unit="mm" x="197.0682" y="6.666" z="90.02922"/>
+    <position name="nohole_motherboard5_assembly_v28" unit="mm" x="163.8958" y="8.166" z="147.4855"/>
+    <position name="nohole_motherboard5_assembly_v29" unit="mm" x="163.8958" y="6.666" z="147.4855"/>
+    <position name="nohole_motherboard5_assembly_v30" unit="mm" x="113.0958" y="8.166" z="176.8149"/>
+    <position name="nohole_motherboard5_assembly_v31" unit="mm" x="113.0958" y="6.666" z="176.8149"/>
+    <position name="nohole_motherboard5_assembly_v32" unit="mm" x="113.0958" y="8.166" z="235.4737"/>
+    <position name="nohole_motherboard5_assembly_v33" unit="mm" x="113.0958" y="6.666" z="235.4737"/>
+    <position name="nohole_motherboard5_assembly_v34" unit="mm" x="15.03572" y="8.166" z="290.9177"/>
+    <position name="nohole_motherboard5_assembly_v35" unit="mm" x="15.03572" y="6.666" z="290.9177"/>
+    <position name="nohole_motherboard5_assembly_v36" unit="mm" x="3.285533" y="1.666" z="294.5171"/>
+    <position name="nohole_motherboard5_assembly_v37" unit="mm" x="72.92485" y="1.666" z="255.1424"/>
+    <position name="nohole_motherboard5_assembly_v38" unit="mm" x="3.285533" y="0.066" z="294.5171"/>
+    <position name="nohole_motherboard5_assembly_v39" unit="mm" x="72.92485" y="0.066" z="255.1424"/>
+    <position name="nohole_motherboard5_assembly_v40" unit="mm" x="42.66021" y="1.666" z="364.1564"/>
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+    <position name="nohole_motherboard5_assembly_v42" unit="mm" x="112.2995" y="1.666" z="324.7817"/>
+    <position name="nohole_motherboard5_assembly_v43" unit="mm" x="112.2995" y="0.066" z="324.7817"/>
+    <position name="nohole_motherboard5_assembly_v44" unit="mm" x="42.12177" y="4.666" z="305.2989"/>
+    <position name="nohole_motherboard5_assembly_v45" unit="mm" x="62.14307" y="4.666" z="293.9787"/>
+    <position name="nohole_motherboard5_assembly_v46" unit="mm" x="42.12177" y="1.666" z="305.2989"/>
+    <position name="nohole_motherboard5_assembly_v47" unit="mm" x="62.14307" y="1.666" z="293.9787"/>
+    <position name="nohole_motherboard5_assembly_v48" unit="mm" x="53.44199" y="4.666" z="325.3202"/>
+    <position name="nohole_motherboard5_assembly_v49" unit="mm" x="53.44199" y="1.666" z="325.3202"/>
+    <position name="nohole_motherboard5_assembly_v50" unit="mm" x="73.46329" y="4.666" z="314.0"/>
+    <position name="nohole_motherboard5_assembly_v51" unit="mm" x="73.46329" y="1.666" z="314.0"/>
+    <position name="nohole_motherboard5_assembly_v52" unit="mm" x="59.94467" y="6.666" z="272.8205"/>
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+    <position name="nohole_motherboard5_assembly_v54" unit="mm" x="59.94467" y="1.666" z="272.8205"/>
+    <position name="nohole_motherboard5_assembly_v55" unit="mm" x="66.90861" y="1.666" z="268.883"/>
+    <position name="nohole_motherboard5_assembly_v56" unit="mm" x="90.46005" y="6.666" z="326.791"/>
+    <position name="nohole_motherboard5_assembly_v57" unit="mm" x="90.46005" y="1.666" z="326.791"/>
+    <position name="nohole_motherboard5_assembly_v58" unit="mm" x="97.42398" y="6.666" z="322.8535"/>
+    <position name="nohole_motherboard5_assembly_v59" unit="mm" x="97.42398" y="1.666" z="322.8535"/>
+    <position name="nohole_motherboard5_assembly_v60" unit="mm" x="18.16108" y="6.666" z="296.4453"/>
+    <position name="nohole_motherboard5_assembly_v61" unit="mm" x="25.12501" y="6.666" z="292.5078"/>
+    <position name="nohole_motherboard5_assembly_v62" unit="mm" x="18.16108" y="1.666" z="296.4453"/>
+    <position name="nohole_motherboard5_assembly_v63" unit="mm" x="25.12501" y="1.666" z="292.5078"/>
+    <position name="nohole_motherboard5_assembly_v64" unit="mm" x="48.67646" y="6.666" z="350.4158"/>
+    <position name="nohole_motherboard5_assembly_v65" unit="mm" x="48.67646" y="1.666" z="350.4158"/>
+    <position name="nohole_motherboard5_assembly_v66" unit="mm" x="55.64039" y="6.666" z="346.4783"/>
+    <position name="nohole_motherboard5_assembly_v67" unit="mm" x="55.64039" y="1.666" z="346.4783"/>
+    <position name="nohole_motherboard5_assembly_v68" unit="mm" x="47.04064" y="1.666" z="371.9038"/>
+    <position name="nohole_motherboard5_assembly_v69" unit="mm" x="116.68" y="1.666" z="332.5291"/>
+    <position name="nohole_motherboard5_assembly_v70" unit="mm" x="47.04064" y="0.066" z="371.9038"/>
+    <position name="nohole_motherboard5_assembly_v71" unit="mm" x="116.68" y="0.066" z="332.5291"/>
+    <position name="nohole_motherboard5_assembly_v72" unit="mm" x="86.41532" y="1.666" z="441.5431"/>
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+    <position name="nohole_motherboard5_assembly_v74" unit="mm" x="156.0546" y="1.666" z="402.1684"/>
+    <position name="nohole_motherboard5_assembly_v75" unit="mm" x="156.0546" y="0.066" z="402.1684"/>
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+    <position name="nohole_motherboard5_assembly_v84" unit="mm" x="103.6998" y="6.666" z="350.2072"/>
+    <position name="nohole_motherboard5_assembly_v85" unit="mm" x="110.6637" y="6.666" z="346.2697"/>
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+    <position name="nohole_motherboard5_assembly_v87" unit="mm" x="110.6637" y="1.666" z="346.2697"/>
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+    <position name="nohole_motherboard5_assembly_v91" unit="mm" x="141.1791" y="1.666" z="400.2402"/>
+    <position name="nohole_motherboard5_assembly_v92" unit="mm" x="61.91619" y="6.666" z="373.832"/>
+    <position name="nohole_motherboard5_assembly_v93" unit="mm" x="68.88013" y="6.666" z="369.8945"/>
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+    <position name="nohole_motherboard5_assembly_v95" unit="mm" x="68.88013" y="1.666" z="369.8945"/>
+    <position name="nohole_motherboard5_assembly_v96" unit="mm" x="92.43157" y="6.666" z="427.8025"/>
+    <position name="nohole_motherboard5_assembly_v97" unit="mm" x="92.43157" y="1.666" z="427.8025"/>
+    <position name="nohole_motherboard5_assembly_v98" unit="mm" x="99.3955" y="6.666" z="423.865"/>
+    <position name="nohole_motherboard5_assembly_v99" unit="mm" x="99.3955" y="1.666" z="423.865"/>
+  </define>
+
+  <solids>
+    <tessellated aunit="deg" lunit="mm" name="nohole_motherboard5_assembly-SOL">
+       <triangular vertex1="nohole_motherboard5_assembly_v0" vertex2="nohole_motherboard5_assembly_v1" vertex3="nohole_motherboard5_assembly_v2"/>
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+    </tessellated>
+  </solids>
+
+  <structure>
+    <volume name="nohole_motherboard5_assembly">
+      <materialref ref="FR40x27264f0"/>
+      <solidref ref="nohole_motherboard5_assembly-SOL"/>
+    </volume>
+  </structure>
+
+  <setup name="Default" version="1.0">
+    <world ref="nohole_motherboard5_assembly"/>
+  </setup>
+</gdml>
diff --git a/Detectors/data/ldmx-reduced-v2/ecal_motherboard6_assembly.gdml b/Detectors/data/ldmx-reduced-v2/ecal_motherboard6_assembly.gdml
new file mode 100644
index 000000000..edde53477
--- /dev/null
+++ b/Detectors/data/ldmx-reduced-v2/ecal_motherboard6_assembly.gdml
@@ -0,0 +1,372 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no" ?>
+<gdml xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://service-spi.web.cern.ch/service-spi/app/releases/GDML/schema/gdml.xsd">
+
+  <define>
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+      <solidref ref="nohole_motherboard6_assembly-SOL"/>
+    </volume>
+  </structure>
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+  <setup name="Default" version="1.0">
+    <world ref="nohole_motherboard6_assembly"/>
+  </setup>
+</gdml>
diff --git a/Detectors/data/ldmx-reduced-v2/ecal_support_box.gdml b/Detectors/data/ldmx-reduced-v2/ecal_support_box.gdml
new file mode 100644
index 000000000..c8a4d7c1f
--- /dev/null
+++ b/Detectors/data/ldmx-reduced-v2/ecal_support_box.gdml
@@ -0,0 +1,1491 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no" ?>
+<gdml xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://service-spi.web.cern.ch/service-spi/app/releases/GDML/schema/gdml.xsd">
+
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+       <triangular vertex1="support_box_v448" vertex2="support_box_v479" vertex3="support_box_v478"/>
+       <triangular vertex1="support_box_v448" vertex2="support_box_v478" vertex3="support_box_v443"/>
+       <triangular vertex1="support_box_v443" vertex2="support_box_v478" vertex3="support_box_v471"/>
+       <triangular vertex1="support_box_v443" vertex2="support_box_v471" vertex3="support_box_v442"/>
+       <triangular vertex1="support_box_v442" vertex2="support_box_v471" vertex3="support_box_v470"/>
+       <triangular vertex1="support_box_v432" vertex2="support_box_v469" vertex3="support_box_v433"/>
+       <triangular vertex1="support_box_v433" vertex2="support_box_v469" vertex3="support_box_v485"/>
+       <triangular vertex1="support_box_v433" vertex2="support_box_v485" vertex3="support_box_v434"/>
+       <triangular vertex1="support_box_v434" vertex2="support_box_v485" vertex3="support_box_v484"/>
+       <triangular vertex1="support_box_v434" vertex2="support_box_v484" vertex3="support_box_v437"/>
+       <triangular vertex1="support_box_v437" vertex2="support_box_v484" vertex3="support_box_v477"/>
+       <triangular vertex1="support_box_v437" vertex2="support_box_v477" vertex3="support_box_v438"/>
+       <triangular vertex1="support_box_v438" vertex2="support_box_v477" vertex3="support_box_v476"/>
+       <triangular vertex1="support_box_v438" vertex2="support_box_v476" vertex3="support_box_v409"/>
+       <triangular vertex1="support_box_v409" vertex2="support_box_v476" vertex3="support_box_v475"/>
+       <triangular vertex1="support_box_v409" vertex2="support_box_v475" vertex3="support_box_v410"/>
+       <triangular vertex1="support_box_v410" vertex2="support_box_v475" vertex3="support_box_v459"/>
+       <triangular vertex1="support_box_v410" vertex2="support_box_v459" vertex3="support_box_v411"/>
+       <triangular vertex1="support_box_v411" vertex2="support_box_v459" vertex3="support_box_v460"/>
+       <triangular vertex1="support_box_v411" vertex2="support_box_v460" vertex3="support_box_v426"/>
+       <triangular vertex1="support_box_v426" vertex2="support_box_v460" vertex3="support_box_v461"/>
+       <triangular vertex1="support_box_v426" vertex2="support_box_v461" vertex3="support_box_v427"/>
+       <triangular vertex1="support_box_v427" vertex2="support_box_v461" vertex3="support_box_v468"/>
+    </tessellated>
+  </solids>
+
+  <structure>
+    <volume name="support_box">
+      <materialref ref="G4_Al0x2705780"/>
+      <solidref ref="support_box-SOL"/>
+    </volume>
+  </structure>
+
+  <setup name="Default" version="1.0">
+    <world ref="support_box"/>
+  </setup>
+</gdml>
diff --git a/Detectors/data/ldmx-reduced-v2/hcal.gdml b/Detectors/data/ldmx-reduced-v2/hcal.gdml
new file mode 100644
index 000000000..a5e565aa9
--- /dev/null
+++ b/Detectors/data/ldmx-reduced-v2/hcal.gdml
@@ -0,0 +1,448 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no" ?>
+<!DOCTYPE gdml [
+<!ENTITY constants SYSTEM "constants.gdml">
+]>
+<gdml xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://service-spi.web.cern.ch/service-spi/app/releases/GDML/schema/gdml.xsd">
+
+  <define>
+
+    &constants; 
+
+    <!-- loop variables - must be defined here -->
+    <variable name="layer" value="1"/>
+    <variable name="strip" value="1"/>
+    <variable name="module" value="1"/>
+    <variable name="section" value="1"/>
+
+    <!-- 
+        Starting positions of steel / scintillator of the back HCal w.r.t 
+        center of the HCal mother volume, put absorber first.
+    -->        
+    <variable name="back_hcal_startZ" value="side_hcal_dz/2.0 - back_hcal_dz/2.0"/>
+    <variable name="back_hcal_startZAbso" value="back_hcal_startZ + hcal_airThick + back_hcal_absoThick/2.0"/>
+    <variable name="back_hcal_startZScint" value="back_hcal_startZ + hcal_airThick + back_hcal_absoThick + hcal_airThick + hcal_scintThick/2.0"/>
+    <variable name="back_hcal_startXScint" value="-back_hcal_dx/2.0 + hcal_scintWidth/2.0"/>
+    <variable name="back_hcal_startYScint" value="-back_hcal_dy/2.0 + hcal_scintWidth/2.0"/>
+
+    <!-- Side HCal sections: 1,2,3,4 are Top, Bottom, Left, Right -->
+    <matrix name="side_hcal_sign" coldim="1" values="-1 1 -1 1"/>
+    <matrix name="side_hcal_startXAbso" coldim="1" values="-(ecal_side_dx/2.0+hcal_airThick+side_hcal_absoThick)
+                 ecal_side_dx/2.0+hcal_airThick+side_hcal_absoThick
+                 -(ecal_side_dx/2.0+hcal_airThick+side_hcal_absoThick/2.0)
+                 ecal_side_dx/2.0+hcal_airThick+side_hcal_absoThick/2.0"/>
+    <matrix name="side_hcal_startXScint" coldim="1" values="ecal_side_dx/2.0+hcal_airThick+side_hcal_absoThick
+                  -(ecal_side_dx/2.0+hcal_airThick+side_hcal_absoThick)
+                  ecal_side_dx/2.0+2.0*hcal_airThick+side_hcal_absoThick+hcal_scintThick/2.0
+                  -(ecal_side_dx/2.0+2.0*hcal_airThick+side_hcal_absoThick+hcal_scintThick/2.0)"/>
+    <matrix name="side_hcal_startYAbso" coldim="1" values="ecal_side_dy/2.0+hcal_airThick+side_hcal_absoThick/2.0
+                 -(ecal_side_dy/2.0+hcal_airThick+side_hcal_absoThick/2.0)
+                 -(ecal_side_dy)
+                 (ecal_side_dy)"/>
+    <matrix name="side_hcal_startYScint" coldim="1" values="ecal_side_dy/2.0+2.0*hcal_airThick+side_hcal_absoThick+hcal_scintThick/2.0
+                  -(ecal_side_dy/2.0+2.0*hcal_airThick+side_hcal_absoThick+hcal_scintThick/2.0)
+                  -(ecal_side_dy/2.0-hcal_scintWidth/2.0)
+                  ecal_side_dy/2.0-hcal_scintWidth/2.0"/>
+  </define>
+    
+  <materials>
+    <isotope N="16" Z="8" name="O16">
+      <atom unit="g/mole" value="15.9949"/>
+    </isotope>
+    <isotope N="17" Z="8" name="O17">
+      <atom unit="g/mole" value="16.9991"/>
+    </isotope>
+    <isotope N="18" Z="8" name="O18">
+      <atom unit="g/mole" value="17.9992"/>
+    </isotope>
+    <element name="O">
+      <fraction n="0.99757" ref="O16"/>
+      <fraction n="0.00038" ref="O17"/>
+      <fraction n="0.00205" ref="O18"/>
+    </element>
+    <isotope N="12" Z="6" name="C12">
+      <atom unit="g/mole" value="12"/>
+    </isotope>
+    <isotope N="13" Z="6" name="C13">
+      <atom unit="g/mole" value="13.0034"/>
+    </isotope>
+    <element name="C">
+      <fraction n="0.9893" ref="C12"/>
+      <fraction n="0.0107" ref="C13"/>
+    </element>
+    <isotope N="1" Z="1" name="H1">
+      <atom unit="g/mole" value="1.00782503081372"/>
+    </isotope>
+    <isotope N="2" Z="1" name="H2">
+      <atom unit="g/mole" value="2.01410199966617"/>
+    </isotope>
+    <element name="H">
+      <fraction n="0.999885" ref="H1"/>
+      <fraction n="0.000115" ref="H2"/>
+    </element>
+    <material name="G4_C" state="solid">
+      <T unit="K" value="293.15"/>
+      <MEE unit="eV" value="81"/>
+      <D unit="g/cm3" value="2"/>
+      <fraction n="1" ref="C"/>
+    </material>
+    <isotope N="14" Z="7" name="N14">
+      <atom unit="g/mole" value="14.0031"/>
+    </isotope>
+    <isotope N="15" Z="7" name="N15">
+      <atom unit="g/mole" value="15.0001"/>
+    </isotope>
+    <element name="N">
+      <fraction n="0.99632" ref="N14"/>
+      <fraction n="0.00368" ref="N15"/>
+    </element>
+    <isotope N="36" Z="18" name="Ar36">
+      <atom unit="g/mole" value="35.9675"/>
+    </isotope>
+    <isotope N="38" Z="18" name="Ar38">
+      <atom unit="g/mole" value="37.9627"/>
+    </isotope>
+    <isotope N="40" Z="18" name="Ar40">
+      <atom unit="g/mole" value="39.9624"/>
+    </isotope>
+    <element name="Ar">
+      <fraction n="0.003365" ref="Ar36"/>
+      <fraction n="0.000632" ref="Ar38"/>
+      <fraction n="0.996003" ref="Ar40"/>
+    </element>
+    <material name="G4_AIR" state="gas">
+      <T unit="K" value="293.15"/>
+      <MEE unit="eV" value="85.7"/>
+      <D unit="g/cm3" value="0.00120479"/>
+      <fraction n="0.000124000124000124" ref="C"/>
+      <fraction n="0.755267755267755" ref="N"/>
+      <fraction n="0.231781231781232" ref="O"/>
+      <fraction n="0.0128270128270128" ref="Ar"/>
+    </material>
+    <isotope N="55" Z="25" name="Mn55">
+      <atom unit="g/mole" value="54.938"/>
+    </isotope>
+    <element name="Mn">
+      <fraction n="1" ref="Mn55"/>
+    </element>
+    <isotope N="54" Z="26" name="Fe54">
+      <atom unit="g/mole" value="53.9396"/>
+    </isotope>
+    <isotope N="56" Z="26" name="Fe56">
+      <atom unit="g/mole" value="55.9349"/>
+    </isotope>
+    <isotope N="57" Z="26" name="Fe57">
+      <atom unit="g/mole" value="56.9354"/>
+    </isotope>
+    <isotope N="58" Z="26" name="Fe58">
+      <atom unit="g/mole" value="57.9333"/>
+    </isotope>
+    <element name="Fe">
+      <fraction n="0.05845" ref="Fe54"/>
+      <fraction n="0.91754" ref="Fe56"/>
+      <fraction n="0.02119" ref="Fe57"/>
+      <fraction n="0.00282" ref="Fe58"/>
+    </element>
+    <material name="Steel" state="solid">
+       <T unit="K" value="293.15"/>
+       <D unit="g/cm3" value="7.87"/>
+       <fraction n="0.9843" ref="G4_Fe"/>
+       <fraction n="0.014" ref="G4_Mn"/>
+       <fraction n="0.0017" ref="G4_C"/>
+    </material>
+    <material name="Scintillator" state="solid">
+       <T unit="K" value="293.15"/>
+       <!-- <MEE unit="eV" value="64.7494480275643"/> -->
+       <D unit="g/cm3" value="1.032"/>
+       <fraction n="0.91512109"  ref="G4_C"/>
+       <fraction n="0.084878906" ref="G4_H"/>
+    </material>
+  </materials>
+
+
+  <solids>
+  
+    <!-- - - - - - - - - HCal solids - - - - - - - -  -->
+    <box lunit="mm" name="back_hcal_absoBox" x="back_hcal_dx" y="back_hcal_dy" z="back_hcal_absoThick"/>
+    <box lunit="mm" name="back_hcal_scintXBox" x="back_hcal_dx" y="hcal_scintWidth" z="hcal_scintThick"/>
+    <box lunit="mm" name="back_hcal_scintYBox" x="hcal_scintWidth" y="back_hcal_dy" z="hcal_scintThick"/>
+
+    <loop for="module" from="1" to="side_hcal_numModules" step="1">
+      <box name="side_hcal_absoX[module]Box" lunit="mm"
+     x="side_hcal_length[module]" y="side_hcal_absoThick" z="side_hcal_dz"/>
+      <box name="side_hcal_absoY[module]Box" lunit="mm"
+           x="side_hcal_absoThick" y="side_hcal_length[module]" z="side_hcal_dz"/> 
+      <box name="side_hcal_scintX[module]Box" lunit="mm"
+     x="side_hcal_length[module]" y="hcal_scintThick" z="hcal_scintWidth"/>
+      <box name="side_hcal_scintY[module]Box" lunit="mm"
+           x="hcal_scintThick" y="side_hcal_length[module]" z="hcal_scintWidth"/>
+    </loop>
+    <box lunit="mm" name="side_hcal_scintZXBox" x="hcal_scintWidth" y="hcal_scintThick" z="side_hcal_dz"/>    
+    <box lunit="mm" name="side_hcal_scintZYBox" x="hcal_scintThick" y="hcal_scintWidth" z="side_hcal_dz"/>
+
+    <!-- - - - - - - - - Parent Volumes - - - - - - - -->     
+    <box lunit="mm" name="all_hcal_Box" x="hcal_envelope_dx" y="hcal_envelope_dy" z="hcal_dz"/>
+    <box lunit="mm" name="ecal_Box" x="ecal_side_dx" y="ecal_side_dy" z="side_hcal_dz"/>
+    <!-- The second solid is placed with given position, in the coordinates of the first solid -->
+    <subtraction name="hadron_calorimeter_Box">
+      <first ref="all_hcal_Box"/>
+      <second ref="ecal_Box"/>
+      <position name="hadron_calorimeter_parent_Box_pos" unit="mm" x="0." y="0." z="-back_hcal_dz/2.0"/>    
+    </subtraction>
+    
+  </solids>
+  
+  <structure>      
+    
+    <!-- - - - - - - - -  BACK HCAL STRUCTURES - - - - - - - -  -->
+    <volume name="back_hcal_absoVolume">
+      <materialref ref="Steel" />
+      <solidref ref="back_hcal_absoBox" />
+    </volume>
+
+    <volume name="back_hcal_scintYVolume">
+      <materialref ref="Scintillator" />
+      <solidref ref="back_hcal_scintYBox" />
+    </volume>
+
+    <volume name="back_hcal_scintXVolume">
+      <materialref ref="Scintillator" />
+      <solidref ref="back_hcal_scintXBox" />
+    </volume>
+
+    <!-- - - - - - - - -  SIDE HCAL STRUCTURES - - - - - - - -  -->
+    <loop for="module" from="1" to="side_hcal_numModules" step="1">
+      <volume name="side_hcal_absoX[module]Volume">
+        <materialref ref="Steel" />
+        <solidref ref="side_hcal_absoX[module]Box" />
+      </volume>
+      <volume name="side_hcal_absoY[module]Volume">
+        <materialref ref="Steel" />
+        <solidref ref="side_hcal_absoY[module]Box" />
+      </volume>
+      <volume name="side_hcal_scintX[module]Volume">
+        <materialref ref="Scintillator" />
+        <solidref ref="side_hcal_scintX[module]Box" />
+      </volume>
+      <volume name="side_hcal_scintY[module]Volume">
+        <materialref ref="Scintillator" />
+        <solidref ref="side_hcal_scintY[module]Box" />
+      </volume>
+    </loop>
+
+    <volume name="side_hcal_scintZXVolume">
+      <materialref ref="Scintillator" />
+      <solidref ref="side_hcal_scintZXBox" />
+    </volume>
+    <volume name="side_hcal_scintZYVolume">
+      <materialref ref="Scintillator" />
+      <solidref ref="side_hcal_scintZYBox" />
+    </volume>
+      
+      <!-- - - - - - - - -  FULL HCAL STRUCTURES - - - - - - - -  -->
+    <volume name="hadronic_calorimeter">
+      <materialref ref="G4_AIR" />
+      <solidref ref="hadron_calorimeter_Box" />
+      <!-- BACK HCAL  -->
+        <!-- Note the step size of 2  -->
+        <loop for="layer" from="1" to="back_hcal_numLayers" step="2">
+
+          <!-- Back Hcal Absorbers -->
+          <!-- Note: Placing two volumes at once since we are stepping two layers at a time  -->
+          <physvol name="back_hcal_absoPhysvol">
+            <volumeref ref="back_hcal_absoVolume"/>
+            <position name="back_hcal_abso1Pos" unit="mm"
+                      x="0"
+                      y="0"
+                      z="back_hcal_startZAbso + (layer-1)*back_hcal_layerThick"/>
+          </physvol>
+
+          <physvol name="back_hcal_absoPhysvol">
+            <volumeref ref="back_hcal_absoVolume"/>
+            <position name="back_hcal_abso2Pos" unit="mm"
+                      x="0"
+                      y="0"
+                      z="back_hcal_startZAbso + (layer)*back_hcal_layerThick"/>
+          </physvol>
+
+          <!-- Back Hcal Strips oriented along X-axis  -->
+          <loop for="strip" from="1" to="back_hcal_numScint" step="1">
+            <physvol name="back_hcal_scintXPhysvol"
+                     copynumber="1*256*256*256 + 0*256*256 + (layer)*256 + (strip-1)">
+              <volumeref ref="back_hcal_scintXVolume"/>
+              <position name="back_hcal_scintXPos" unit="mm"
+                        x="0"
+                        y="back_hcal_startYScint + (strip-1)*hcal_scintWidth"
+                        z="back_hcal_startZScint + (layer-1)*back_hcal_layerThick"/>
+            </physvol>
+          </loop>
+
+          <!-- Back Hcal Strips oriented along Y-axis  -->
+          <loop for="strip" from="1" to="back_hcal_numScint" step="1">
+            <physvol name="back_hcal_scintYPhysvol"
+                     copynumber="1*256*256*256 + 0*256*256 + (layer+1)*256 + (strip-1)">
+              <volumeref ref="back_hcal_scintYVolume"/>
+              <position name="back_hcal_scintYPos" unit="mm"
+                        x="back_hcal_startXScint + (strip-1)*hcal_scintWidth"
+                        y="0"
+                        z="back_hcal_startZScint + (layer)*back_hcal_layerThick"/>
+            </physvol>
+          </loop>
+        </loop> <!-- Back Hcal layer  -->
+
+        <!-- SIDE HCAL layers oriented in x -->
+        <!--
+            Extra lenghts per module: ( side_hcal_length[module]-side_hcal_length[1] )/2.
+            Extra x/y per layer:
+            (odd): (layer-1)*side_hcal_layerThick + 2*side_hcal_layerThick*side_hcal_numPrevLayers[module]
+            (even): (layer)*side_hcal_layerThick + 2*side_hcal_layerThick*side_hcal_numPrevLayers[module]
+            Extra x/y for strips oriented in z:
+            hcal_scintWidth*(strip)
+        -->
+        <loop for="section" from="1" to="2" step="1">
+          <loop for="module" from="1" to="side_hcal_numModules" step="1">
+            <loop for="layer" from="1" to="side_hcal_numLayers[module]*2" step="2">
+              <!--
+            Absorber plates oriented in x
+            x (start): ecal_side_dx/2.0
+                       +hcal_airThick+side_hcal_absoThick ( to account for absorber in y from the other sections )
+            y (start): ecal_side_dy/2.0
+                       +hcal_airThick+side_hcal_absoThick/2.0 ( to account for air and so that absorber is centered)
+              -->
+              <physvol name="side_hcal_absoX1[section][module][layer]Physvol">
+                <volumeref ref="side_hcal_absoX[module]Volume"/>
+                <position name="side_hcal_absoX1[section][module][layer]Pos" unit="mm"
+                          x="side_hcal_startXAbso[section] + side_hcal_sign[section]*( side_hcal_length[module]-side_hcal_length[1] )/2."
+                          y="side_hcal_startYAbso[section] - side_hcal_sign[section]*( (layer-1)*side_hcal_layerThick + 2*side_hcal_layerThick*side_hcal_numPrevLayers[module] )"
+                          z="-back_hcal_dz/2.0"/>
+              </physvol>
+
+              <!--
+            Short strips oriented in z
+            x (start): ecal_side_dx/2.0 (similar to absorber but with different sign)
+                       -hcal_scintWidth/2.0 ( so that scintillator is centered)
+            y (start): ecal_side_dy/2.0
+                       +2.0*hcal_airThick+side_hcal_absoThick+hcal_scintThick/2.0 ( to account for air,absober and so that scintillator is centered)
+              -->
+              <loop for="strip" from="1" to="side_hcal_numScintZ[module]" step="1">
+                <physvol name="side_hcal_scintZX[section][module][strip]Physvol"
+                         copynumber="1*256*256*256 + (section)*256*256 + (layer+2*side_hcal_numPrevLayers[module])*256 + (strip-1)">
+                  <volumeref ref="side_hcal_scintZXVolume"/>
+                  <position name="side_hcal_scintZX[section][module][strip]Pos" unit="mm"
+                            x="-side_hcal_sign[section]*(ecal_side_dx/2.0-hcal_scintWidth/2.0) + side_hcal_sign[section]*(strip-1)*hcal_scintWidth"
+                            y="side_hcal_startYScint[section] - side_hcal_sign[section]*( (layer-1)*side_hcal_layerThick + 2*side_hcal_layerThick*side_hcal_numPrevLayers[module])"
+                            z="-back_hcal_dz/2.0"/>
+                </physvol>
+              </loop>
+
+              <!--
+            Absorber plates oriented in x
+            x (start): same x as in first absorber
+            y (start): same y as in first absorber but with extra y for even layer
+              -->
+              <physvol name="side_hcal_absoX2[section][module]Physvol">
+                <volumeref ref="side_hcal_absoX[module]Volume"/>
+                <position name="side_hcal_absoX2[section][module]Pos" unit="mm"
+                          x="side_hcal_startXAbso[section] + side_hcal_sign[section]*( side_hcal_length[module]-side_hcal_length[1] )/2."
+                          y="side_hcal_startYAbso[section] - side_hcal_sign[section]*( (layer)*side_hcal_layerThick + 2*side_hcal_layerThick*side_hcal_numPrevLayers[module] )"
+                          z="-back_hcal_dz/2.0"/>
+              </physvol>
+
+              <!--
+            Long strips oriented in x
+            x (start): ecal_side_dx/2.0+hcal_airThick+side_hcal_absoThick * -1 (to be centered)
+            y (start): same as scintillator oriented in z but with extra y for even layer
+            z (start): -back_hcal_dz/2.0 - side_hcal_dz/2.0
+                                   + hcal_scintWidth/2.0 ( so that is centered)
+              -->
+              <loop for="strip" from="1" to="side_hcal_numScintXY" step="1">
+                <physvol name="side_hcal_scintX[section][module][strip]Physvol"
+                         copynumber="1*256*256*256 + (section)*256*256 + (layer+1+2*side_hcal_numPrevLayers[module])*256 + (strip-1)">
+                  <volumeref ref="side_hcal_scintX[module]Volume"/>
+                  <position name="side_hcal_scintX[section][module][strip]Pos" unit="mm"
+                            x="side_hcal_startXScint[section]*-1 + side_hcal_sign[section]*( side_hcal_length[module]-side_hcal_length[1] )/2."
+                            y="side_hcal_startYScint[section] - side_hcal_sign[section]*( (layer)*side_hcal_layerThick + 2*side_hcal_layerThick*side_hcal_numPrevLayers[module] )"
+                            z="-back_hcal_dz/2.0 - side_hcal_dz/2.0 + hcal_scintWidth/2.0 + (strip-1)*hcal_scintWidth"/>
+                </physvol>
+              </loop>
+            </loop> <!-- X-oriented Side Hcal Layers -->
+          </loop> <!-- X-oriented Side Hcal Modules  -->
+        </loop> <!-- X-oriented Side Hcal Sections -->
+
+        <!-- SIDE HCAL layers oriented in y -->
+        <loop for="section" from="3" to="4" step="1">
+          <loop for="module" from="1" to="side_hcal_numModules" step="1">
+            <loop for="layer" from="1" to="side_hcal_numLayers[module]*2" step="2">
+
+              <!--
+            Absorber plates oriented in y
+            x (start): ecal_side_dx/2.0 + (hcal_airThick+side_hcal_absoThick/2.0)
+            y (start): ecal_side_dy ( if its ecal_side_dy/2.0, the absorber plates are not centered, use ecal_side_dy to get them centered)
+              -->
+              <physvol name="side_hcal_absoY1[section][module][layer]Physvol">
+                <volumeref ref="side_hcal_absoY[module]Volume"/>
+                <position name="side_hcal_absoY1[section][module][layer]Pos" unit="mm"
+                          x="side_hcal_startXAbso[section] + side_hcal_sign[section]*( (layer-1)*side_hcal_layerThick + 2*side_hcal_layerThick*side_hcal_numPrevLayers[module] )"
+                          y="side_hcal_startYAbso[section] + side_hcal_sign[section]*( side_hcal_length[module]-side_hcal_length[1] )/2."
+                          z="-back_hcal_dz/2.0"/>
+              </physvol >
+
+              <!--
+            Short strips oriented in z
+            x (start): ecal_side_dx/2.0 + (2.0*hcal_airThick+side_hcal_absoThick+hcal_scintThick/2.0)
+            y (start): ecal_side_dy/2.0 - hcal_scintWidth/2.0
+              -->
+              <loop for="strip" from="1" to="side_hcal_numScintZ[module]" step="1">
+                <physvol name="side_hcal_scintZY[section][module][strip]Physvol"
+                         copynumber="1*256*256*256 + (section)*256*256 + (layer+2*side_hcal_numPrevLayers[module])*256 + (strip-1)">
+                  <volumeref ref="side_hcal_scintZYVolume"/>
+                  <position name="side_hcal_scintZY[section][module][strip]Pos" unit="mm"
+                            x="side_hcal_startXScint[section] - side_hcal_sign[section]*( (layer-1)*side_hcal_layerThick + 2*side_hcal_layerThick*side_hcal_numPrevLayers[module] )"
+                            y="side_hcal_startYScint[section] - side_hcal_sign[section]*hcal_scintWidth*(strip-1)"
+                            z="-back_hcal_dz/2.0"/>
+                </physvol>
+              </loop>
+
+              <!--
+            Absorber plates oriented in y
+            x (start): same as first absorber
+            y (start): same as first absorber
+              -->
+              <physvol name="side_hcal_absoY2[section][module]Physvol">
+                <volumeref ref="side_hcal_absoY[module]Volume"/>
+                <position name="side_hcal_absoY2[section][module]Pos" unit="mm"
+                          x="side_hcal_startXAbso[section] + side_hcal_sign[section]*( (layer)*side_hcal_layerThick + 2*side_hcal_layerThick*side_hcal_numPrevLayers[module] )"
+                          y="side_hcal_startYAbso[section] + side_hcal_sign[section]*( side_hcal_length[module]-side_hcal_length[1] )/2."
+                          z="-back_hcal_dz/2.0"/>
+              </physvol>
+
+              <!--
+            Long strips oriented in y (each strip increases in x)
+            x (start): ecal_side_dx/2.0 + (2.0*hcal_airThick+side_hcal_absoThick+hcal_scintThick/2.0)
+            y (start): ecal_side_dy
+            z (start): -back_hcal_dz/2.0 - side_hcal_dz/2.0
+                       + (strip-1)*hcal_scintWidth ( to account for different strips)
+              -->
+              <loop for="strip" from="1" to="side_hcal_numScintXY" step="1">
+                <physvol name="side_hcal_scintY[section][module][strip]Physvol"
+                         copynumber="1*256*256*256 + (section)*256*256 + (layer+1+2*side_hcal_numPrevLayers[module])*256 + (strip-1)">
+                  <volumeref ref="side_hcal_scintY[module]Volume"/>
+                  <position name="side_hcal_scintY[section][module][strip]Pos" unit="mm"
+                            x="side_hcal_startXScint[section] - side_hcal_sign[section]*( (layer)*side_hcal_layerThick + 2*side_hcal_layerThick*side_hcal_numPrevLayers[module] )"
+                            y="-side_hcal_sign[section]*ecal_side_dy - side_hcal_sign[section]*( side_hcal_length[module]-side_hcal_length[1] )/2."
+                            z="-back_hcal_dz/2.0 - side_hcal_dz/2.0 + hcal_scintWidth/2.0 + (strip-1)*hcal_scintWidth"/>
+                </physvol>
+              </loop>
+            </loop> <!-- Y-oriented Side Hcal Layers -->
+          </loop> <!-- Y-oriented Side Hcal Modules -->
+        </loop> <!-- Y-oriented Side Hcal Sections  -->
+
+      <auxiliary auxtype="Region" auxvalue="CalorimeterRegion"/>
+      <auxiliary auxtype="VisAttributes" auxvalue="HcalVis"/>
+      <auxiliary auxtype="DetElem" auxvalue="Hcal"/>
+    </volume>
+  </structure>
+  
+  <setup name="Default" version="1.0">
+    <world ref="hadronic_calorimeter"/>
+  </setup>
+</gdml>
diff --git a/Detectors/data/ldmx-reduced-v2/materials.gdml b/Detectors/data/ldmx-reduced-v2/materials.gdml
new file mode 100644
index 000000000..2403d69f1
--- /dev/null
+++ b/Detectors/data/ldmx-reduced-v2/materials.gdml
@@ -0,0 +1,45 @@
+
+<element Z="1" formula="H" name="H">
+  <atom type="A" unit="g/mol" value="1.00794"/>
+</element>
+<element Z="6" formula="C" name="C">
+  <atom type="A" unit="g/mol" value="12.0107"/>
+</element>
+<element Z="7" formula="N" name="N">
+  <atom type="A" unit="g/mol" value="14.0068"/>
+</element>
+<element Z="8" formula="O" name="O">
+  <atom type="A" unit="g/mol" value="15.9994"/>
+</element>
+<element Z="18" formula="Ar" name="Ar">
+  <atom type="A" unit="g/mol" value="39.9477"/>
+</element>
+<element Z="74" formula="W" name="W">
+  <atom type="A" unit="g/mol" value="183.842"/>
+</element>           
+
+<material name="Air" state="gas">
+  <MEE unit="eV" value="85.643664635028"/>
+  <D unit="g/cm3" value="0.00119999936860922"/>
+  <fraction n="0.754" ref="N"/>
+  <fraction n="0.234" ref="O"/>
+  <fraction n="0.012" ref="Ar"/>
+</material>
+<material name="Carbon" state="solid">
+  <MEE unit="eV" value="81"/>
+  <D unit="g/cm3" value="1.99999894768203"/>
+  <fraction n="1" ref="C"/>
+</material>
+<element Z="14" formula="Si" name="Si">
+  <atom type="A" unit="g/mol" value="28.0854"/>
+</element>
+<material name="Silicon" state="solid">
+  <MEE unit="eV" value="173"/>
+  <D unit="g/cm3" value="2.32999877404956"/>
+  <fraction n="1" ref="Si"/>
+</material>
+<material name="Vacuum" state="gas">
+  <MEE unit="eV" value="19.2"/>
+  <D unit="g/cm3" value="9.99999473841014e-09"/>
+  <fraction n="1" ref="H"/>
+</material>
diff --git a/Detectors/data/ldmx-reduced-v2/recoil.gdml b/Detectors/data/ldmx-reduced-v2/recoil.gdml
new file mode 100644
index 000000000..4afc3a90f
--- /dev/null
+++ b/Detectors/data/ldmx-reduced-v2/recoil.gdml
@@ -0,0 +1,140 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no" ?>
+<!DOCTYPE gdml [
+<!ENTITY constants SYSTEM "constants.gdml">
+<!ENTITY materials SYSTEM "materials.gdml">
+]>
+<gdml xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
+      xsi:noNamespaceSchemaLocation="http://service-spi.web.cern.ch/service-spi/app/releases/GDML/schema/gdml.xsd">
+  <define>      
+    &constants;
+  
+    <variable name="i" value="1" /> 
+
+    <!-- layering start position in envelope volume -->
+    <variable name="recoil_envelope_up_face_z" value="-(recoil_envelope_dz/2)" />
+
+    <!-- Position in z of each sensor in the local coordinates of the envelope volume --> 
+    <variable name="recoil_l1_z"  
+              value="recoil_envelope_up_face_z + tracker_envelope_clearance"/>
+    <matrix name="recoil_l14_z" coldim="1" 
+            values=" recoil_l1_z
+                     recoil_l1_z+recoil_delta_l14
+                     recoil_l1_z+2*recoil_delta_l14
+                     recoil_l1_z+3*recoil_delta_l14" />
+
+    <variable name="recoil_l5_mid_z" 
+              value="recoil_l1_z+3*recoil_delta_l14+recoil_delta_l45" />
+    <matrix name="recoil_l5_z" coldim="1" 
+      values="recoil_l5_mid_z+recoil_l56_sensor_sep
+              recoil_l5_mid_z-recoil_l56_sensor_sep
+              recoil_l5_mid_z+recoil_l56_sensor_sep
+              recoil_l5_mid_z-recoil_l56_sensor_sep
+              recoil_l5_mid_z+recoil_l56_sensor_sep
+              recoil_l5_mid_z+recoil_l56_sensor_sep
+              recoil_l5_mid_z-recoil_l56_sensor_sep
+              recoil_l5_mid_z+recoil_l56_sensor_sep
+              recoil_l5_mid_z-recoil_l56_sensor_sep
+              recoil_l5_mid_z+recoil_l56_sensor_sep" />
+   
+    <variable name="recoil_l6_mid_z" value="recoil_l5_mid_z+recoil_delta_l56" /> 
+    <matrix name="recoil_l6_z" coldim="1" 
+      values="recoil_l6_mid_z+recoil_l56_sensor_sep
+              recoil_l6_mid_z-recoil_l56_sensor_sep
+              recoil_l6_mid_z+recoil_l56_sensor_sep
+              recoil_l6_mid_z-recoil_l56_sensor_sep
+              recoil_l6_mid_z+recoil_l56_sensor_sep
+              recoil_l6_mid_z+recoil_l56_sensor_sep
+              recoil_l6_mid_z-recoil_l56_sensor_sep
+              recoil_l6_mid_z+recoil_l56_sensor_sep
+              recoil_l6_mid_z-recoil_l56_sensor_sep
+              recoil_l6_mid_z+recoil_l56_sensor_sep" />
+    
+    <matrix name="recoil_l56_xy" coldim="2" values=" 96.0  40.0 
+                                                     48.0  40.0 
+                                                     0.0   40.0
+                                                    -48.0  40.0
+                                                    -96.0  40.0 
+                                                     96.0 -40.0 
+                                                     48.0 -40.0 
+                                                     0.0  -40.0 
+                                                    -48.0 -40.0 
+                                                    -96.0 -40.0" />
+    
+    <matrix name="recoil_l14_rot" coldim="1" values=" stereo_angle
+                                                     -stereo_angle
+                                                      stereo_angle
+                                                     -stereo_angle" />
+  </define>
+  <materials> 
+    &materials;
+  </materials>
+  <solids>
+    <box lunit="mm" name="recoil_l14_active_sensor_box" 
+         x="si_large_active_sensor_dx" y="si_large_active_sensor_dy" z="si_sensor_thickness"/>
+    <box lunit="mm" name="recoil_l14_sensor_box" 
+         x="si_large_sensor_dx" y="si_large_sensor_dy" z="si_sensor_thickness"/>
+    <box lunit="mm" name="recoil_l56_active_sensor_box" 
+         x="si_large_active_sensor_dx" y="si_large_active_sensor_dy" z="si_sensor_thickness"/>
+    <box lunit="mm" name="recoil_l56_sensor_box" 
+         x="si_large_sensor_dx" y="si_large_sensor_dy" z="si_sensor_thickness"/>
+    <box lunit="mm" name="recoil_box" 
+         x="recoil_envelope_dx" y="recoil_envelope_dy" z="recoil_envelope_dz"/>
+  </solids>
+
+  <structure>
+    <!-- Define a recoil sensor as a active box inside an inactive box -->  
+    <volume name="Recoil_l14_active_Sensor_vol">
+      <materialref ref="Silicon"/>
+      <solidref ref="recoil_l14_active_sensor_box"/>
+      <auxiliary auxtype="VisAttributes" auxvalue="InvisibleNoDau"/>
+    </volume>
+    <volume name="recoil_l14_sensor_vol">
+      <materialref ref="Silicon"/>
+      <solidref ref="recoil_l14_sensor_box"/>
+      <physvol name="recoil_l14_active_sensor">
+        <volumeref ref="Recoil_l14_active_Sensor_vol"/>
+        <position name="recoil_l14_active_sensor_pos" unit="mm" x="0.0" y="0.0" z="0.0"/>
+      </physvol>
+    </volume>
+    <volume name="Recoil_l56_active_Sensor_vol">
+      <materialref ref="Silicon"/>
+      <solidref ref="recoil_l56_active_sensor_box"/>
+      <auxiliary auxtype="VisAttributes" auxvalue="InvisibleNoDau"/>
+    </volume>
+    <volume name="recoil_l56_sensor_vol">
+      <materialref ref="Silicon"/>
+      <solidref ref="recoil_l56_sensor_box"/>
+      <physvol name="recoil_l56_active_sensor">
+        <volumeref ref="Recoil_l56_active_Sensor_vol"/>
+        <position name="recoil_l56_active_sensor_pos" unit="mm" x="0.0" y="0.0" z="0.0"/>
+      </physvol>
+    </volume>
+    <volume name="recoil">
+      <materialref ref="Air"/>
+      <solidref ref="recoil_box"/>
+      <loop for="i" from="1" to="2" step="1"> 
+        <!-- Axial sensors --> 
+        <physvol copynumber="20*i-10"> 
+          <volumeref ref="recoil_l14_sensor_vol"/> 
+          <position name="recoil_l14_axial_pos" unit="mm" x="0.0" y="0.0" 
+                    z="recoil_l14_z[i] - recoil_l14_sensor_sep" /> 
+        </physvol>
+        <!-- Stereo sensors -->
+        <physvol copynumber="20*i"> 
+          <volumeref ref="recoil_l14_sensor_vol"/> 
+          <position name="recoil_l14_stereo_pos" unit="mm" x="0.0" y="0.0" 
+                    z="recoil_l14_z[i] + recoil_l14_sensor_sep" /> 
+          <rotation name="recoil_l14_stereo_rot" unit="deg" x="0" y="0" z="recoil_l14_rot[i]"/>
+        </physvol>
+      </loop>
+      <!-- Removed the axial layer sensors for the reduced LDMX--> 
+      <auxiliary auxtype="VisAttributes" auxvalue="InvisibleShowDau"/>
+      <auxiliary auxtype="DetElem" auxvalue="recoil"/>
+    </volume>
+  </structure>
+
+  <setup name="Default" version="1.0">
+    <world ref="recoil"/>
+  </setup>
+
+</gdml>
diff --git a/Detectors/data/ldmx-reduced-v2/scoring_planes.gdml b/Detectors/data/ldmx-reduced-v2/scoring_planes.gdml
new file mode 100644
index 000000000..3acac00b0
--- /dev/null
+++ b/Detectors/data/ldmx-reduced-v2/scoring_planes.gdml
@@ -0,0 +1,363 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE gdml [
+<!ENTITY constants SYSTEM "constants.gdml">
+]>
+<gdml xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
+    xsi:noNamespaceSchemaLocation="http://service-spi.web.cern.ch/service-spi/app/releases/GDML/schema/gdml.xsd">
+
+  <define>
+
+    &constants;  
+
+    <variable name="x"  value="0" /> 
+    <variable name="x2" value="1" />
+    <variable name="xTS1" value="1" />
+    <variable name="xTS" value="1" />
+    <variable name="x4" value="0" />
+    <variable name="x5" value="1" /> 
+    <variable name="x7" value="1" />
+    <variable name="x8" value="1" />
+    <variable name="x9" value="1" />
+    <variable name="x10" value="1" />
+    <variable name="x11" value="1" />
+    <variable name="x12" value="1" />
+
+    <!-- Thickness of the scoring planes -->
+    <constant name="sp_thickness" value="0.001*mm"/>
+
+    <!-- Surround the ecal with scoring planes -->
+    <variable name="sp_ecal_front_z" 
+      value="ecal_front_z - sp_thickness/2 - clearance" /> 
+    <variable name="sp_ecal_back_z"  
+      value="ecal_front_z + ecal_envelope_z + sp_thickness/2" />
+    <variable name="sp_ecal_top_y"   
+      value="ecal_envelope_y/2. + sp_thickness/2" />
+    <variable name="sp_ecal_bot_y"   
+      value="-ecal_envelope_y/2 - sp_thickness/2" />
+    <variable name="sp_ecal_left_x"  
+      value="-ecal_envelope_x/2 - sp_thickness/2" />
+    <variable name="sp_ecal_right_x" 
+      value="ecal_envelope_x/2 + sp_thickness/2" />
+    <variable name="sp_ecal_mid_z"   
+      value="ecal_front_z + ecal_envelope_z/2." />
+    
+    <matrix name="sp_ecal_pos" coldim="3" values="0 support_box_shift sp_ecal_front_z
+                            0 support_box_shift sp_ecal_back_z
+                            0 sp_ecal_top_y+support_box_shift sp_ecal_mid_z
+                            0 sp_ecal_bot_y+support_box_shift sp_ecal_mid_z  
+                            sp_ecal_left_x support_box_shift sp_ecal_mid_z
+                            sp_ecal_right_x support_box_shift sp_ecal_mid_z" />   
+
+    <matrix name="ecal_box_dim" coldim="3" values="ecal_envelope_x ecal_envelope_y sp_thickness
+                             ecal_envelope_x sp_thickness ecal_envelope_z
+                             sp_thickness ecal_envelope_y ecal_envelope_z" /> 
+
+    <!-- Magnet gap dimensions -->
+    <variable name="sp_magnet_gap_top_y"   value="magnet_gap_dy/2 + sp_thickness/2" />
+    <variable name="sp_magnet_gap_bot_y"   value="-magnet_gap_dy/2 - sp_thickness/2" />
+    <variable name="sp_magnet_gap_left_x"  value="-magnet_gap_dx/2 - sp_thickness/2" />
+    <variable name="sp_magnet_gap_right_x" value="magnet_gap_dx/2 - sp_thickness/2" />
+    <variable name="sp_magnet_gap_mid_z"   value="-400*mm" />
+
+    <matrix name="sp_magnet_gap_pos" coldim="2" values="0 sp_magnet_gap_top_y
+                                                        0 sp_magnet_gap_bot_y 
+                                                        sp_magnet_gap_left_x 0 
+                                                        sp_magnet_gap_right_x 0" />
+            
+
+    <!-- Surround the Hcal with scoring planes -->
+    <variable name="sp_hcal_front_z"  value="ecal_front_z - sp_thickness/2 + clearance" />
+    <variable name="sp_hcal_back_z"   value="ecal_front_z + back_hcal_dz + side_hcal_dz + sp_thickness/2" />
+    <variable name="sp_hcal_top_y"  value="hcal_envelope_dy/2 + sp_thickness/2" />
+    <variable name="sp_hcal_bot_y"  value="-hcal_envelope_dy/2 - sp_thickness/2" />
+    <variable name="sp_hcal_left_x"   value="-hcal_envelope_dy/2 - sp_thickness/2" />
+    <variable name="sp_hcal_right_x"  value="hcal_envelope_dx/2 + sp_thickness/2" />
+    <variable name="sp_hcal_mid_z"  value="ecal_front_z + hcal_dz/2" />
+
+    <matrix name="sp_hcal_pos" coldim="3" values="0 support_box_shift sp_hcal_front_z
+                            0 support_box_shift sp_hcal_back_z
+                            0 sp_hcal_top_y+support_box_shift sp_hcal_mid_z
+                            0 sp_hcal_bot_y+support_box_shift sp_hcal_mid_z  
+                            sp_hcal_left_x support_box_shift sp_hcal_mid_z
+                            sp_hcal_right_x support_box_shift sp_hcal_mid_z" />   
+
+    <matrix name="hcal_box_dim" coldim="3" values="hcal_envelope_dx hcal_envelope_dy sp_thickness
+                             hcal_envelope_dx sp_thickness hcal_dz
+                             sp_thickness hcal_envelope_dy hcal_dz" />
+
+    <!-- Dimensions of target box -->
+    <variable name="target_box_x" value="magnet_gap_dx - (sp_thickness/2)" />
+    <variable name="target_box_y" value="magnet_gap_dy - (sp_thickness/2)" />
+
+    <!-- Surround the target with scoring planes --> 
+    <variable name="sp_target_down_z" value="target_z + target_thickness/2 + sp_thickness/2 + clearance" />
+    <variable name="sp_target_up_z"   value="target_z - target_thickness/2 - sp_thickness/2 - clearance" />
+    
+    <!-- Place scoring planes up- and downstream of each trigger scintillator array -->
+    <variable name="sp_trigger_pad1_l1_z" 
+          value="trigger_pad1_actual_z -(trigger_pad_thickness/2 + sp_thickness/2 + clearance + trigger_pad_bar_thickness)" /> 
+    <variable name="sp_trigger_pad1_l2_z" 
+          value="trigger_pad1_actual_z + trigger_pad_thickness/2 + sp_thickness/2 + clearance + trigger_pad_bar_thickness" /> 
+
+    <variable name="sp_trigger_pad2_l1_z" 
+          value="trigger_pad2_actual_z -(trigger_pad_thickness/2 + sp_thickness/2 + clearance + trigger_pad_bar_thickness)" /> 
+    <variable name="sp_trigger_pad2_l2_z" 
+          value="trigger_pad2_actual_z + trigger_pad_thickness/2 + sp_thickness/2 + clearance + trigger_pad_bar_thickness" /> 
+
+    <variable name="sp_trigger_pad3_l1_z" 
+          value="trigger_pad3_z -(trigger_pad_thickness/2 + sp_thickness/2 + clearance + trigger_pad_bar_thickness)" /> 
+    <variable name="sp_trigger_pad3_l2_z" 
+          value="trigger_pad3_z + trigger_pad_thickness/2 + sp_thickness/2 + clearance + trigger_pad_bar_thickness" />
+
+    <!-- Dimensions of trigger scintillator box -->
+    <variable name="trigscint_box_x" value="magnet_gap_dx - (sp_thickness/2)" />
+    <variable name="trigscint_box_y" value="magnet_gap_dy - (sp_thickness/2)" />
+    
+    
+    <!-- Matrix with target area positions --> 
+    <matrix name="sp_target_pos" coldim="3" values="0 0 sp_target_down_z
+                            0 0 sp_target_up_z" />
+
+    <!-- Matrix with trigscint  positions -->
+    <matrix name="sp_trigscint_pos" coldim="3" values="0 0 sp_trigger_pad1_l1_z  
+                            0 0 sp_trigger_pad1_l2_z
+                            0 0 sp_trigger_pad2_l1_z  
+                            0 0 sp_trigger_pad2_l2_z
+                            0 0 sp_trigger_pad3_l1_z  
+                            0 0 sp_trigger_pad3_l2_z" />
+    
+        
+    <!-- Place scoring planes at each of the recoil tracker layers -->
+    <variable name="sp_recoil_l1_z" 
+              value="9*mm + tracker_envelope_clearance" /> 
+    <variable name="sp_recoil_l2_z" 
+              value="sp_recoil_l1_z+recoil_delta_l14" /> 
+    <variable name="sp_recoil_l3_z" 
+              value="sp_recoil_l1_z+2*recoil_delta_l14" /> 
+    <variable name="sp_recoil_l4_z" 
+              value="sp_recoil_l1_z+3*recoil_delta_l14" /> 
+    <variable name="sp_recoil_l5_z" 
+              value="sp_recoil_l4_z+recoil_delta_l45" /> 
+    <variable name="sp_recoil_l6_z" 
+              value="sp_recoil_l5_z+recoil_delta_l56" /> 
+    <matrix name="sp_recoil_layer_z" coldim="1" values="sp_recoil_l1_z
+                                                        sp_recoil_l2_z
+                                                        sp_recoil_l3_z
+                                                        sp_recoil_l4_z
+                                                        sp_recoil_l5_z
+                                                        sp_recoil_l6_z" />
+    <!-- Dimensions of recoil box -->
+    <variable name="recoil_box_x" value="magnet_gap_dx - (sp_thickness/2)" />
+    <variable name="recoil_box_y" value="magnet_gap_dy - (sp_thickness/2)" />
+
+  </define>
+
+  <materials>
+    <material name="Vacuum" Z="1" state="gas">
+      <D unit="g/cm3" value="1e-12"/>
+      <atom unit="g/mole" value="1" />
+    </material> 
+  </materials>
+
+  <solids>
+    <box name="world_box" x="world_dim" y="world_dim" z="world_dim"/>
+
+    <box name="sp_ecal_front_back_box" x="ecal_box_dim[1, 1]" y="ecal_box_dim[1, 2]" z="ecal_box_dim[1, 3]" />
+    <box name="sp_ecal_top_bot_box" x="ecal_box_dim[2, 1]" y="ecal_box_dim[2, 2]" z="ecal_box_dim[2, 3]" />
+    <box name="sp_ecal_left_right_box" x="ecal_box_dim[3, 1]" y="ecal_box_dim[3, 2]" z="ecal_box_dim[3, 3]" />
+    
+    <box name="sp_magnet_gap_top_bot_box"   x="magnet_gap_dx" y="sp_thickness" z="magnet_gap_dz" />
+    <box name="sp_magnet_gap_left_right_box"  x="sp_thickness" y="magnet_gap_dy" z="magnet_gap_dz" />
+
+    <box name="sp_hcal_front_back_box" x="hcal_box_dim[1, 1]" y="hcal_box_dim[1, 2]" z="hcal_box_dim[1, 3]" />
+    <box name="sp_hcal_top_bot_box" x="hcal_box_dim[2, 1]" y="hcal_box_dim[2, 2]" z="hcal_box_dim[2, 3]" />
+    <box name="sp_hcal_left_right_box" x="hcal_box_dim[3, 1]" y="hcal_box_dim[3, 2]" z="hcal_box_dim[3, 3]" />
+
+    <box name="sp_target_box" x="target_box_x" y="target_box_y" z="sp_thickness" />
+
+    <box name="sp_recoil_box"  x="recoil_box_x" y="recoil_box_y" z="sp_thickness" />
+
+    <box name="sp_trigscint_box" x="trigscint_box_x" y="trigscint_box_y" z="sp_thickness" />
+
+  </solids>
+
+  <structure>
+    
+    <!-- Define the target and scoring plane volumes --> 
+    <loop for="x" to="2" step="1" >
+      <volume name="sp_target">
+        <materialref ref="Vacuum" />
+        <solidref ref="sp_target_box" />
+        <auxiliary auxtype="VisAttributes" auxvalue="SpVis"/>
+      </volume> 
+    </loop>
+
+
+    <loop for="xTS1" to="6" step="1" >
+      <!-- 
+        we capitalize the S here so that the ScoringPlaneSD configuration code
+        doesn't need to change lmao 
+      -->
+      <volume name="sp_trigScint">
+        <materialref ref="Vacuum" />
+        <solidref ref="sp_trigscint_box" />
+        <auxiliary auxtype="VisAttributes" auxvalue="SpVis"/>
+      </volume> 
+    </loop>
+
+    
+    <loop for="x4" to="5" step="1" > 
+      <volume name="sp_recoil"> 
+        <materialref ref="Vacuum" />
+        <solidref ref="sp_recoil_box" />
+        <auxiliary auxtype="VisAttributes" auxvalue="SpVis"/>
+      </volume> 
+    </loop> 
+    
+    <loop for="x11" to="2" step="1" > 
+      <volume name="sp_magnet_gap_top_bot"> 
+        <materialref ref="Vacuum" />
+        <solidref ref="sp_magnet_gap_top_bot_box" />
+        <auxiliary auxtype="VisAttributes" auxvalue="SpVis"/>
+      </volume>
+      <volume name="sp_magnet_gap_left_right"> 
+        <materialref ref="Vacuum" />
+        <solidref ref="sp_magnet_gap_left_right_box" />
+        <auxiliary auxtype="VisAttributes" auxvalue="SpVis"/>
+      </volume> 
+    </loop> 
+
+    <loop for="x7" to="2" step="1" > 
+      <volume name="sp_ecal_front_back"> 
+        <materialref ref="Vacuum" />
+        <solidref ref="sp_ecal_front_back_box" />
+        <auxiliary auxtype="VisAttributes" auxvalue="SpVis"/>
+      </volume>  
+      <volume name="sp_ecal_top_bot"> 
+        <materialref ref="Vacuum" />
+        <solidref ref="sp_ecal_top_bot_box" />
+        <auxiliary auxtype="VisAttributes" auxvalue="SpVis"/>
+      </volume>
+      <volume name="sp_ecal_left_right"> 
+        <materialref ref="Vacuum" />
+        <solidref ref="sp_ecal_left_right_box" />
+        <auxiliary auxtype="VisAttributes" auxvalue="SpVis"/>
+      </volume> 
+    </loop>
+
+    <loop for="x9" to="2" step="1" > 
+      <volume name="sp_hcal_front_back"> 
+        <materialref ref="Vacuum" />
+        <solidref ref="sp_hcal_front_back_box" />
+        <auxiliary auxtype="VisAttributes" auxvalue="SpVis"/>
+      </volume>  
+      <volume name="sp_hcal_top_bot"> 
+        <materialref ref="Vacuum" />
+        <solidref ref="sp_hcal_top_bot_box" />
+        <auxiliary auxtype="VisAttributes" auxvalue="SpVis"/>
+      </volume>
+      <volume name="sp_hcal_left_right"> 
+        <materialref ref="Vacuum" />
+        <solidref ref="sp_hcal_left_right_box" />
+        <auxiliary auxtype="VisAttributes" auxvalue="SpVis"/>
+      </volume> 
+    </loop>
+
+    <volume name="SP_World">
+      <materialref ref="Vacuum" />
+      <solidref ref="world_box" />
+      
+      <loop for="x2" to="2" step="1">
+        <physvol copynumber="x2">
+          <volumeref ref="sp_target" />
+          <position x="sp_target_pos[x2, 1]" y="sp_target_pos[x2, 2]" z="sp_target_pos[x2, 3]" /> 
+          <rotationref ref="identity" />
+        </physvol>
+      </loop>
+
+    <loop for="xTS" to="6" step="1">
+    <physvol copynumber="xTS+4">
+      <volumeref ref="sp_trigScint" />
+      <position x="sp_trigscint_pos[xTS, 1]" y="sp_trigscint_pos[xTS, 2]" z="sp_trigscint_pos[xTS, 3]" /> 
+      <rotationref ref="identity" />
+    </physvol>
+      </loop>
+
+
+      <loop for="x5" to="6" step="1">
+        <physvol copynumber="20 + x5">
+          <volumeref ref="sp_recoil" />
+          <position x="0.0" y="0.0" z="sp_recoil_layer_z[x5]" /> 
+          <rotationref ref="identity" />
+        </physvol>
+      </loop>
+
+      <loop for="x12" to="2" step="1" > 
+        <physvol copynumber="50 + x8">
+          <volumeref ref="sp_magnet_gap_top_bot" />
+          <position x="sp_magnet_gap_pos[x12, 1]" y="sp_magnet_gap_pos[x12, 2]" z="magnet_pos_z" />
+          <rotationref ref="identity" />
+        </physvol>
+        <physvol copynumber="52 + x8">
+          <volumeref ref="sp_magnet_gap_left_right" />
+          <position x="sp_magnet_gap_pos[x12 + 2, 1]" y="sp_magnet_gap_pos[x12 + 2, 2]" z="magnet_pos_z" />
+          <rotationref ref="identity" />
+        </physvol> 
+      </loop>
+
+      <loop for="x8" to="2" step="1" > 
+        <physvol copynumber="30 + x8">
+          <volumeref ref="sp_ecal_front_back" />
+          <position x="sp_ecal_pos[x8, 1]" y="sp_ecal_pos[x8, 2]" z="sp_ecal_pos[x8, 3]" />
+          <rotationref ref="identity" />
+        </physvol> 
+        <physvol copynumber="32 + x8">
+          <volumeref ref="sp_ecal_top_bot" />
+          <position x="sp_ecal_pos[x8 + 2, 1]" y="sp_ecal_pos[x8 + 2, 2]" z="sp_ecal_pos[x8 + 2, 3]" />
+          <rotationref ref="identity" />
+        </physvol>
+        <physvol copynumber="34 + x8">
+          <volumeref ref="sp_ecal_left_right" />
+          <position x="sp_ecal_pos[x8 + 4, 1]" y="sp_ecal_pos[x8 + 4, 2]" z="sp_ecal_pos[x8 + 4, 3]" />
+          <rotationref ref="identity" />
+        </physvol> 
+      </loop> 
+      
+      <loop for="x10" to="2" step="1" > 
+        <physvol copynumber="40 + x10">
+          <volumeref ref="sp_hcal_front_back" />
+          <position x="sp_hcal_pos[x10, 1]" y="sp_hcal_pos[x10, 2]" z="sp_hcal_pos[x10, 3]" />
+          <rotationref ref="identity" />
+        </physvol> 
+        <physvol copynumber="42 + x10">
+          <volumeref ref="sp_hcal_top_bot" />
+          <position x="sp_hcal_pos[x10 + 2, 1]" y="sp_hcal_pos[x10 + 2, 2]" z="sp_hcal_pos[x10 + 2, 3]" />
+          <rotationref ref="identity" />
+        </physvol>
+        <physvol copynumber="44 + x10">
+          <volumeref ref="sp_hcal_left_right" />
+          <position x="sp_hcal_pos[x10 + 4, 1]" y="sp_hcal_pos[x10 + 4, 2]" z="sp_hcal_pos[x10 + 4, 3]" />
+          <rotationref ref="identity" />
+        </physvol> 
+      </loop> 
+
+    </volume>
+  </structure>
+
+  <userinfo>
+    <auxiliary auxtype="VisAttributes" auxvalue="SpVis">
+      <auxiliary auxtype="R" auxvalue="0.0"/>
+      <auxiliary auxtype="G" auxvalue="0.0"/>
+      <auxiliary auxtype="B" auxvalue="1.0"/>
+      <auxiliary auxtype="A" auxvalue="1.0"/>
+      <auxiliary auxtype="Style" auxvalue="wireframe"/>
+      <auxiliary auxtype="DaughtersInvisible" auxvalue="false"/>
+      <auxiliary auxtype="Visible" auxvalue="true"/>
+      <auxiliary auxtype="LineWidth" auxvalue="2.0"/>
+    </auxiliary>
+  </userinfo>
+
+  <setup name="Default" version="1.0">
+    <world ref="SP_World" />
+  </setup>
+</gdml>
diff --git a/Detectors/data/ldmx-reduced-v2/tagger.gdml b/Detectors/data/ldmx-reduced-v2/tagger.gdml
new file mode 100644
index 000000000..1ae8f801b
--- /dev/null
+++ b/Detectors/data/ldmx-reduced-v2/tagger.gdml
@@ -0,0 +1,89 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<!DOCTYPE gdml [
+<!ENTITY constants SYSTEM "constants.gdml">
+<!ENTITY materials SYSTEM "materials.gdml">
+]>
+<gdml xmlns:gdml="http://cern.ch/2001/Schemas/GDML" 
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
+    xsi:noNamespaceSchemaLocation="http://service-spi.web.cern.ch/service-spi/app/releases/GDML/schema/gdml.xsd">
+  <define>
+    &constants;  
+
+    <variable name="i" value="1" />                            
+
+    <!-- layer positions in x assuming a 4GeV electron in a 1.5 T field. -->
+    <matrix name="tagger_layer_x" coldim="1" values=" -0.006*mm
+                              -0.681*mm
+                              -2.481*mm
+                              -5.407*mm
+                              -9.461*mm
+                              -14.643*mm
+                              -20.955*mm" />
+                             
+                                  
+    <!-- Position of the downstream face of the tagger envelope. -->
+    <variable name="tagger_envelope_down_face_z" value="tagger_envelope_dz/2"/>
+    
+    <!-- Positions in z of each layer. -->
+    <variable name="tagger_l7_mid_z" value="tagger_envelope_down_face_z - tracker_envelope_clearance"/>
+    <matrix name="tagger_layer_z" coldim="1" values=" tagger_l7_mid_z
+                              tagger_l7_mid_z-tagger_layer_delta
+                              tagger_l7_mid_z-2*tagger_layer_delta
+                              tagger_l7_mid_z-3*tagger_layer_delta
+                              tagger_l7_mid_z-4*tagger_layer_delta
+                              tagger_l7_mid_z-5*tagger_layer_delta
+                              tagger_l7_mid_z-6*tagger_layer_delta" />
+  
+    <!-- Rotation of stereo layer. -->
+    <matrix name="tagger_rot" coldim="1" values=" stereo_angle
+                            -stereo_angle
+                            stereo_angle
+                            -stereo_angle
+                            stereo_angle
+                            -stereo_angle
+                            stereo_angle" />
+  
+  
+  </define>
+  <materials> 
+    &materials;
+  </materials>
+  <solids>
+    <box lunit="mm" name="tagger_active_sensor_box" 
+       x="si_active_sensor_dx" y="si_active_sensor_dy" z="si_sensor_thickness"/>
+    <box lunit="mm" name="tagger_sensor_box" 
+       x="si_sensor_dx" y="si_sensor_dy" z="si_sensor_thickness"/>
+    <box lunit="mm" name="tagger_box" 
+       x="tagger_envelope_dx" y="tagger_envelope_dy" z="tagger_envelope_dz"/>
+  </solids>
+  <structure>
+    <!-- define tagger sensor as a active box inside an inactive box -->  
+    <volume name="Tagger_active_Sensor_vol">
+      <materialref ref="Silicon"/>
+      <solidref ref="tagger_active_sensor_box"/>
+      <auxiliary auxtype="VisAttributes" auxvalue="InvisibleNoDau"/>
+    </volume>
+    <volume name="tagger_sensor_vol">
+      <materialref ref="Silicon"/>
+      <solidref ref="tagger_sensor_box"/>
+      <physvol name="tagger_active_sensor">
+      <volumeref ref="Tagger_active_Sensor_vol"/>
+      <position name="tagger_active_sensor_pos" unit="mm" x="0.0" y="0.0" z="0.0"/>
+      </physvol>
+    </volume>
+    
+    <!-- define tagger physical volumes inside envelope volume --> 
+    <volume name="tagger">
+      <materialref ref="Air"/>
+      <solidref ref="tagger_box"/>
+      <!-- removing the sensors since reduced-LDMX will not have a tagger tracker --> 
+      <auxiliary auxtype="Region" auxvalue="tagger"/>
+      <auxiliary auxtype="VisAttributes" auxvalue="InvisibleShowDau"/>
+      <auxiliary auxtype="DetElem" auxvalue="tagger"/>
+    </volume>
+  </structure>
+  <setup name="Default" version="1.0">
+    <world ref="tagger"/>
+  </setup>
+</gdml>
diff --git a/Detectors/data/ldmx-reduced-v2/target.gdml b/Detectors/data/ldmx-reduced-v2/target.gdml
new file mode 100644
index 000000000..f6a86d6cb
--- /dev/null
+++ b/Detectors/data/ldmx-reduced-v2/target.gdml
@@ -0,0 +1,112 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE gdml [
+<!ENTITY constants SYSTEM "constants.gdml">
+]>
+<gdml xmlns:gdml="http://cern.ch/2001/Schemas/GDML" 
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
+    xsi:noNamespaceSchemaLocation="http://service-spi.web.cern.ch/service-spi/app/releases/GDML/schema/gdml.xsd" >
+
+  <define>
+
+    &constants;   
+    
+    <variable name="x" value="1"/>
+
+    <!-- Parent volume dimensions --> 
+    <constant name="target_area_envelope_x" value="magnet_gap_dx - 5" />
+    <constant name="target_area_envelope_y" value="magnet_gap_dy - 5" />
+    <constant name="target_area_envelope_z" value="2*(target_thickness/2 + 2*clearance + trigger_pad_thickness)" />
+
+  </define>
+
+  <solids>
+
+    <box lunit="mm" name="target_area_box" x="target_area_envelope_x" y="target_area_envelope_y" z="target_area_envelope_z" />
+    <box lunit="mm" name="target_box" x="target_dim_x" y="target_dim_y" z="target_thickness"/> 
+    <box lunit="mm" name="trigger_bar_box" x="trigger_bar_dx" y="trigger_bar_dy" z="trigger_pad_bar_thickness" /> 
+
+
+  </solids>
+
+  <materials>
+
+      <material name="Vacuum" state="gas">
+      <MEE unit="eV" value="19.2"/>
+      <D unit="g/cm3" value="9.99999473841014e-09"/>
+      <fraction n="1" ref="H"/>
+    </material>
+    
+    <!-- Target --> 
+    <material name="Tungsten" state="solid">
+      <MEE unit="eV" value="727"/>
+      <D unit="g/cm3" value="19.2999898451316"/>
+      <fraction n="1" ref="W"/>
+    </material>
+
+    
+    <!-- Scintillator -->
+    <material name="Polyvinyltoluene">
+      <D type="density" value="1.023" unit="g/cm3"/>
+      <composite n="27" ref="C"/>
+      <composite n="30" ref="H"/>
+    </material>
+
+  </materials>
+
+  <structure>
+
+    <volume name="target">
+      <materialref ref="Tungsten"/>
+      <solidref ref="target_box"/>
+      <auxiliary auxtype="VisAttributes" auxvalue="TargetVis"/>
+      <auxiliary auxtype="DetElem" auxvalue="Target"/>
+    </volume>
+
+    <volume name="trigger_pad3_bar_volume">
+      <materialref ref="Polyvinyltoluene"/>
+      <solidref ref="trigger_bar_box"/>
+      <auxiliary auxtype="VisAttributes" auxvalue="TriggerPadVis"/>
+      <auxiliary auxtype="DetElem" auxvalue="TriggerPad"/>
+    </volume>
+
+    <volume name="TS_trgt">
+      <materialref ref="Vacuum"/>
+      <solidref ref="target_area_box" />
+
+      <loop for="x" to="number_of_bars" step="1">
+        <physvol copynumber="2*x-2">
+          <volumeref ref="trigger_pad3_bar_volume" />
+          <position name="trigger_pad3_bar_layer1_pos" unit="mm" 
+          		x="0"
+                y="-target_dim_y/2 + trigger_bar_dy*(x - 0.5) + trigger_pad_bar_gap*(x - 1) + trigger_pad_offset" 
+                z="trigger_pad3_z - trigger_pad_bar_thickness/2 - trigger_pad_bar_gap/2" />
+          <rotationref ref="identity" />
+        </physvol>
+        <physvol copynumber="2*x - 1">
+          <volumeref ref="trigger_pad3_bar_volume" />
+          <position name="trigger_pad3_bar_layer2_pos" unit="mm" 
+          		x="0"
+                y="-target_dim_y/2 + trigger_bar_dy*x + trigger_pad_bar_gap*(x - 1) + trigger_pad_offset" 
+                z="trigger_pad3_z + trigger_pad_bar_thickness/2 + trigger_pad_bar_gap/2" />
+          <rotationref ref="identity" />
+        </physvol>
+      </loop>
+
+      <physvol copynumber="3">
+        <volumeref ref="target"/>
+        <positionref ref="center"/>
+        <rotationref ref="identity"/>
+      </physvol>
+
+      <auxiliary auxtype="Region" auxvalue="target" />
+      <!-- <auxiliary auxtype="VisAttributes" auxvalue="InvisibleShowDau"/> -->
+      <auxiliary auxtype="DetElem" auxvalue="target"/>
+
+    </volume>
+
+  </structure> 
+
+  <setup name="Default" version="1.0">
+    <world ref="TS_trgt"/>
+  </setup>
+</gdml>
diff --git a/Detectors/data/ldmx-reduced-v2/trig_scint.gdml b/Detectors/data/ldmx-reduced-v2/trig_scint.gdml
new file mode 100644
index 000000000..1c1baf4c6
--- /dev/null
+++ b/Detectors/data/ldmx-reduced-v2/trig_scint.gdml
@@ -0,0 +1,109 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE gdml [
+<!ENTITY constants SYSTEM "constants.gdml">
+]>
+<gdml xmlns:gdml="http://cern.ch/2001/Schemas/GDML" 
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
+    xsi:noNamespaceSchemaLocation="http://service-spi.web.cern.ch/service-spi/app/releases/GDML/schema/gdml.xsd" >
+
+  <define>
+
+    &constants;   
+    
+    <variable name="x" value="1"/>
+
+  
+  </define>
+
+  <solids>
+
+    <box lunit="mm" name="trigger_pad_box" x="trig_scint_area_envelope_x" y="trig_scint_area_envelope_y" z="trig_scint_area_envelope_z"/>
+    <box lunit="mm" name="trigger_bar_box" x="trigger_bar_dx" y="trigger_bar_dy" z="trigger_pad_bar_thickness" />
+  
+  </solids>
+
+  <materials>
+
+      <material name="Vacuum" state="gas">
+      <MEE unit="eV" value="19.2"/>
+      <D unit="g/cm3" value="9.99999473841014e-09"/>
+      <fraction n="1" ref="H"/>
+    </material>
+    
+    <!-- Scintillator -->
+    <material name="Polyvinyltoluene">
+      <D type="density" value="1.023" unit="g/cm3"/>
+      <composite n="27" ref="C"/>
+      <composite n="30" ref="H"/>
+    </material>
+
+  </materials>
+
+  <structure>
+
+    <volume name="trigger_pad2_bar_volume">
+      <materialref ref="Polyvinyltoluene"/>
+      <solidref ref="trigger_bar_box"/>
+      <auxiliary auxtype="VisAttributes" auxvalue="TriggerPadVis"/>
+      <auxiliary auxtype="DetElem" auxvalue="TriggerPad"/>
+    </volume>
+
+    <volume name="trigger_pad1_bar_volume">
+      <materialref ref="Polyvinyltoluene"/>
+      <solidref ref="trigger_bar_box"/>
+      <auxiliary auxtype="VisAttributes" auxvalue="TriggerPadVis"/>
+      <auxiliary auxtype="DetElem" auxvalue="TriggerPad"/>
+    </volume>
+
+    <volume name="trig_scint_tagger">
+      <materialref ref="Vacuum"/>
+      <solidref ref="trigger_pad_box" />
+      <loop for="x" to="number_of_bars" step="1">
+        <physvol copynumber="2*x-2">
+          <volumeref ref="trigger_pad2_bar_volume" />
+          <position name="trigger_pad2_bar_layer1_pos" unit="mm" 
+          		x="0"
+                y="-target_dim_y/2 + trigger_bar_dy*(x - 0.5) + trigger_pad_bar_gap*(x - 1) + trigger_pad_offset" 
+                z="trig_scint_area_envelope_z/2 + trigger_pad2_z - trigger_pad_bar_thickness/2 - trigger_pad_bar_gap/2" />
+          <rotationref ref="identity" />
+        </physvol>
+        <physvol copynumber="2*x - 1">
+          <volumeref ref="trigger_pad2_bar_volume" />
+          <position name="trigger_pad2_bar_layer2_pos" unit="mm" 
+          		x="0"
+                y="-target_dim_y/2 + trigger_bar_dy*x + trigger_pad_bar_gap*(x - 1) + trigger_pad_offset"
+                z="trig_scint_area_envelope_z/2+trigger_pad2_z + trigger_pad_bar_thickness/2 + trigger_pad_bar_gap/2" />
+          <rotationref ref="identity" />
+        </physvol>
+
+        <physvol copynumber="2*x-2">
+          <volumeref ref="trigger_pad1_bar_volume" />
+          <position name="trigger_pad1_bar_layer1_pos" unit="mm" 
+          		x="0"
+                y="-target_dim_y/2 + trigger_bar_dy*(x - 0.5) + trigger_pad_bar_gap*(x - 1) + trigger_pad_offset"
+                z="trig_scint_area_envelope_z/2+trigger_pad1_z - trigger_pad_bar_thickness/2 - trigger_pad_bar_gap/2" />
+          <rotationref ref="identity" />
+        </physvol>
+        <physvol copynumber="2*x - 1">
+          <volumeref ref="trigger_pad1_bar_volume" />
+          <position name="trigger_pad1_bar_layer2_pos" unit="mm" 
+          		x="0"
+                y="-target_dim_y/2 + trigger_bar_dy*x + trigger_pad_bar_gap*(x - 1) + trigger_pad_offset"
+                z="trig_scint_area_envelope_z/2+trigger_pad1_z + trigger_pad_bar_thickness/2 + trigger_pad_bar_gap/2" />
+          <rotationref ref="identity" />
+        </physvol>
+      </loop>
+
+      <auxiliary auxtype="Region" auxvalue="trig_scint" />
+      <!-- <auxiliary auxtype="VisAttributes" auxvalue="VisibleShowDau"/> -->
+      <auxiliary auxtype="DetElem" auxvalue="TriggerPad"/>
+
+    </volume>
+
+  </structure> 
+
+  <setup name="Default" version="1.0">
+    <world ref="trig_scint_tagger"/>
+  </setup>
+
+</gdml>
diff --git a/Ecal/python/digi.py b/Ecal/python/digi.py
index c0b9bb72c..bc41dd461 100644
--- a/Ecal/python/digi.py
+++ b/Ecal/python/digi.py
@@ -211,3 +211,15 @@ def v14(self) :
                 10.915, 10.915, 14.783, 18.539, 18.539, 18.539, 18.539, 18.539, 18.539, 18.539,
                 18.539, 18.539, 9.938
                 ]
+
+    def reduced_v2(self) :
+        """Generated for the reduced v2 geometry
+
+        TODO: The secondOrderEnergyCorrection for this geometry has yet to be calculated,
+        so the v14 secondOrderEnergyCorrection is being used as a placeholder.
+        """
+
+        self.secondOrderEnergyCorrection = 4000. / 3940.5;
+        self.layerWeights = [ 
+                2.312, 5.417, 9.837, 11.910, 11.910, 11.910
+                ]