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#& xml
<?xml version="1.0" encoding="UTF-8"?>
<!--DOCTYPE HDDS>

  Hall D Geometry Data Base: Forward MWPC for Charged Pion Polarizability
  **************************************************

     version 1.0: Initial version	-DL
	 
By default this detector is not enabled in the standard Hall-D geometry in
HDDS. Here is how to enable it and the rest of the geometry changes needed
for the CPP experiment:

in main_HDDS.xml
=================
1. uncomment the line for the ForwardMWPC in the "forwardPackage" compisition

2. comment out the line for the ComptonEMcal in the "forwardPackage" compisition
   (since it occupies the same space)

3. 


 
<HDDS specification="v1.0" xmlns="http://www.gluex.org/hdds">
-->

<section name        = "ForwardMWPC"
         version     = "1.0"
         date        = "2015-05-07"
         author      = "D. Lawrence"
         top_volume  = "MWPC"
         specification = "v1.0">

<!-- Origin of ForwardMWPC is center of upstream face of the first MWPC -->

<!-- 
  Absorber thicknesses determined from shower development in Iron. (See
  CPPsim slides of June 6, 2017 CPP meeting.)
  
  Spacing between absorbers is 3" for chambers. Exact position values
  come from Google Spreadsheet "CPP Beam Intensity" sheet 2 titled
  "FMWPC positions" in david.lawrence.nn@gmail.com account.
-->

 <composition name="ForwardMWPC" envelope="MWPC">

    <posXYZ volume="CPPAbsorber1" X_Y_Z="0.0  0.0   3.075" />
    <posXYZ volume="CPPChamber"   X_Y_Z="0.0  0.0   9.96"> <layer value="1" /> </posXYZ>
    <posXYZ volume="CPPAbsorber2" X_Y_Z="0.0  0.0  16.545" />
    <posXYZ volume="CPPChamber"   X_Y_Z="0.0  0.0  23.13"> <layer value="2" /> </posXYZ>
    <posXYZ volume="CPPAbsorber3" X_Y_Z="0.0  0.0  29.715" />
    <posXYZ volume="CPPChamber"   X_Y_Z="0.0  0.0  36.3"> <layer value="3" /> </posXYZ>
    <posXYZ volume="CPPAbsorber4" X_Y_Z="0.0  0.0  43.56" />
    <posXYZ volume="CPPChamber"   X_Y_Z="0.0  0.0  50.82"> <layer value="4" /> </posXYZ>
    <posXYZ volume="CPPAbsorber5" X_Y_Z="0.0  0.0  59.33" />
    <posXYZ volume="CPPChamber"   X_Y_Z="0.0  0.0  67.84"> <layer value="5" /> </posXYZ>
    <posXYZ volume="CPPAbsorber6" X_Y_Z="0.0  0.0  79.65" />
    <posXYZ volume="CPPChamber"   X_Y_Z="0.0  0.0  91.46"> <layer value="6" /> </posXYZ>
    <posXYZ volume="CPPAbsorber7" X_Y_Z="0.0  0.0 140.495" />
    <posXYZ volume="CPPChamber"   X_Y_Z="0.0  0.0 189.53"> <layer value="7" /> </posXYZ>
    <posXYZ volume="CPPChamber"   X_Y_Z="0.0  0.0 197.15"> <layer value="8" /> </posXYZ>

  </composition>

 <composition name="CPPAbsorber1" envelope="CPA1"> <posXYZ volume="CPH1" X_Y_Z="0.0 0.0 0.0" /> </composition>
 <composition name="CPPAbsorber2" envelope="CPA2"> <posXYZ volume="CPH2" X_Y_Z="0.0 0.0 0.0" /> </composition>
 <composition name="CPPAbsorber3" envelope="CPA3"> <posXYZ volume="CPH3" X_Y_Z="0.0 0.0 0.0" /> </composition>
 <composition name="CPPAbsorber4" envelope="CPA4"> <posXYZ volume="CPH4" X_Y_Z="0.0 0.0 0.0" /> </composition>
 <composition name="CPPAbsorber5" envelope="CPA5"> <posXYZ volume="CPH5" X_Y_Z="0.0 0.0 0.0" /> </composition>
 <composition name="CPPAbsorber6" envelope="CPA6"> <posXYZ volume="CPH6" X_Y_Z="0.0 0.0 0.0" /> </composition>
 <composition name="CPPAbsorber7" envelope="CPA7"> <posXYZ volume="CPH7" X_Y_Z="0.0 0.0 0.0" /> </composition>

 <composition name="CPPChamber" envelope="CPPF">
    <posXYZ volume="CPPWall" X_Y_Z="0.0 0.0 -1.815" />
    <posXYZ volume="CPPG" X_Y_Z="0.0 0.0 0.0" />
    <posXYZ volume="CPPWall" X_Y_Z="0.0 0.0 1.815" />
 </composition>

 <composition name="CPPWall" envelope="CPPW">
    <posXYZ volume="CPPPlate" X_Y_Z="0.0 0.0 -0.735" />
    <posXYZ volume="CPPC" X_Y_Z="0.0 0.0 0.0" />
    <posXYZ volume="CPPPlate" X_Y_Z="0.0 0.0 0.735" />
 </composition>

 <composition name="CPPPlate" envelope="CPPP">
    <posXYZ volume="CPPH" X_Y_Z="0.0 0.0 0.0" />
 </composition>

  <box name="MWPC" X_Y_Z="165.0 165.0 401.92"  material="Air" comment="forward MWPC mother" />
  
  <!-- Absorbers are 61"x61" square with various thicknesses and a 8cm round beam hole -->
  <box name="CPA1" X_Y_Z="154.94 154.94  6.15" material="Iron" comment="Iron Absorber"/>
  <box name="CPA2" X_Y_Z="154.94 154.94  5.55" material="Iron" comment="Iron Absorber"/>
  <box name="CPA3" X_Y_Z="154.94 154.94  5.55" material="Iron" comment="Iron Absorber"/>
  <box name="CPA4" X_Y_Z="154.94 154.94  6.90" material="Iron" comment="Iron Absorber"/>
  <box name="CPA5" X_Y_Z="154.94 154.94  9.40" material="Iron" comment="Iron Absorber"/>
  <box name="CPA6" X_Y_Z="154.94 154.94 16.00" material="Iron" comment="Iron Absorber"/>
  <box name="CPA7" X_Y_Z="154.94 154.94 90.45" material="Iron" comment="Iron Absorber"/>
  <tubs name="CPH1" Rio_Z="0.0 4.0 6.15"  material="Air" comment="Iron Absorber beam hole" />
  <tubs name="CPH2" Rio_Z="0.0 4.0 5.55"  material="Air" comment="Iron Absorber beam hole" />
  <tubs name="CPH3" Rio_Z="0.0 4.0 5.55"  material="Air" comment="Iron Absorber beam hole" />
  <tubs name="CPH4" Rio_Z="0.0 4.0 6.90"  material="Air" comment="Iron Absorber beam hole" />
  <tubs name="CPH5" Rio_Z="0.0 4.0 9.40"  material="Air" comment="Iron Absorber beam hole" />
  <tubs name="CPH6" Rio_Z="0.0 4.0 16.00" material="Air" comment="Iron Absorber beam hole" />
  <tubs name="CPH7" Rio_Z="0.0 4.0 90.45" material="Air" comment="Iron Absorber beam hole" />

  <!-- MWPC frame is 64" x 64" x 5.26cm  -->
  <box name="CPPF" X_Y_Z="162.56 162.56 5.26"  material="FR-4" comment="G10 frame" />

  <!-- MWPC gas is 60" x 60" x 2cm  -->
  <box name="CPPG" X_Y_Z="152.4 152.4 2.0"  material="FDchamberGas" 
       sensitive="true" comment="Chamber gas" />

  <!-- MWPC aluminum wall 60" x 60" x 1.63cm  -->
  <box name="CPPW" X_Y_Z="152.4 152.4 1.63"  material="Air" comment="Aluminum panel mother" />

  <!-- MWPC aluminum comb 60" x 60" x 1.27cm  -->
  <box name="CPPC" X_Y_Z="152.4 152.4 1.27"  material="AluminumComb" comment="Aluminum comb" />

  <!-- MWPC aluminum plate 60" x 60" x 1/16"  -->
  <box name="CPPP" X_Y_Z="152.4 152.4 0.159"  material="Aluminum" comment="Aluminum plate" />

  <tubs name="CPPH" Rio_Z="0.0 2.54 0.159" material="Air" comment="Aluminum Plate Hole"/>

</section>