gem_tracker_endcap.xml

<lccdd>

  <comment> Endcap Tracker  </comment>        

  <define>
    <constant name="GEMTrackerEndcapP_thickness"      value="min(10.0*cm,ForwardTracking_length)" />
    <constant name="GEMTrackerEndcapN_thickness"      value="min(10.0*cm,BackwardTracking_length)" />
    <constant name="GEMTrackerEndcapP_zmin"           value="CentralTrackingHalfP_length + ForwardPID_length"/>
    <constant name="GEMTrackerEndcapN_zmin"           value="CentralTrackingHalfN_length + BackwardPID_length"/>
    <constant name="GEMTrackerEndcapP_rmin"           value="19*cm" />
    <constant name="GEMTrackerEndcapN_rmin"           value="10*cm" />
    <constant name="GEMTrackerEndcapP_rmax"           value="200*cm" />
    <constant name="GEMTrackerEndcapN_rmax"           value="BackwardPID_rmax" />
    <constant name="GEMTrackerEndcapOpeningAngle"     value="30.4*degree"/>
    <constant name="GEMTrackerEndcap_dz"              value="15*mm" />
    <comment>
      ____X2____ 
      \        /
       \      /    Y (=z for the trd)
        \_X1_/ 
    </comment>
    <constant name="GEMTrackerEndcapP_x1"          value="2.0*GEMTrackerEndcapP_rmin*sin(GEMTrackerEndcapOpeningAngle/2.0)"/>
    <constant name="GEMTrackerEndcapP_x2"          value="2.0*GEMTrackerEndcapP_rmax*sin(GEMTrackerEndcapOpeningAngle/2.0)"/>
    <constant name="GEMTrackerEndcapP_y"           value="GEMTrackerEndcapP_rmax*cos(GEMTrackerEndcapOpeningAngle/2.0) - GEMTrackerEndcapP_rmin"/>
    <constant name="GEMTrackerEndcapN_x1"          value="2.0*GEMTrackerEndcapN_rmin*sin(GEMTrackerEndcapOpeningAngle/2.0)"/>
    <constant name="GEMTrackerEndcapN_x2"          value="2.0*GEMTrackerEndcapN_rmax*sin(GEMTrackerEndcapOpeningAngle/2.0)"/>
    <constant name="GEMTrackerEndcapN_y"           value="GEMTrackerEndcapN_rmax*cos(GEMTrackerEndcapOpeningAngle/2.0) - GEMTrackerEndcapN_rmin"/>

    <comment> 
              Needs implimentation:
	      Carbon fiber support ring and spokes
              Initial preliminary details can be found here: https://www.dropbox.com/s/grt9p8feqlsh52f/GEM-RD-GEMWheel.pdf?dl=0
              This design is still very much preliminary

      // Frame parameters accoring to Kondo's sbsCrossSection.pdf file),
      //frame thickness is from 1*3mm (drift gap) + 5*2mm frames
    </comment>

    <constant name="GEMTrackerEndcapFrame_thickness"     value="13.0 * mm"/>
    <constant name="GEMTrackerEndcapFrameBotEdge_width"  value="10.0 * mm"/>
    <constant name="GEMTrackerEndcapFrameTopEdge_width"  value="15.0 * mm"/>
    <constant name="GEMTrackerEndcapFrameSideEdge_width" value=" 8.0 * mm"/>
    <comment> Account for the fact that GEMs have holes, so they are not solid volumes </comment>
    <constant name="GEMAreaFactor" value="0.80" />
    <comment>
      From https://github.com/eic/EicToyModel/blob/master/source/eicroot/GEMGeoParData.cxx

      // FIXME: put aluminum layer later as well),
      mEntranceWindowMaterial     ( "GEMKapton"),
      mEntranceWindowThickness    (   50.0 * etm::um),

      // Use evaristo.pdf p.10 for the foil parameters:
      //  - drift foil    : 50um kapton + 3um copper)
      //  - GEM foil      : 30um kapton + 3um copper (80% area fraction))
      //  - readout foils : 30um kapton + 3um copper total)
      mDriftFoilKaptonThickness   (   50.0 * etm::um),
      mDriftFoilCopperThickness   (    3.0 * etm::um),
      mGEMFoilAreaFraction        (   0.80),
      mGEMFoilKaptonThickness     (   30.0 * etm::um),
      mGEMFoilCopperThickness     (    3.0 * etm::um),

      mReadoutG10Thickness        (    0.0 * etm::mm),
      mReadoutKaptonThickness     (   30.0 * etm::um), 
      mReadoutCopperThickness     (    3.0 * etm::um),

      // 3mm thick Nomex honeycomb for SBS GEMs),
      mReadoutSupportMaterial     ( "GEMNomex"),
      mReadoutSupportThickness    (    3.0 * etm::mm),

      mEntranceRegionLength       (    3.0 * etm::mm),
      mDriftRegionLength          (    3.0 * etm::mm),
      // Assume triple GEM layout),
      mFirstTransferRegionLength  (    2.0 * etm::mm),
      mSecondTransferRegionLength (    2.0 * etm::mm),
      mInductionRegionLength      (    2.0 * etm::mm)
    </comment>
  </define>

  <limits>
  </limits>

  <regions>
  </regions>

  <display>
  </display>

  <detectors>
    <detector
      id="GEMTrackerEndcapP_ID"
      name="GEMTrackerEndcapP"
      type="athena_GEMTrackerEndcap"
      readout="GEMTrackerEndcapHits"
      vis="AnlRed"
      reflect="false">
      <module name="GEMModule1" vis="TrackerLayerVis">
        <trd x1="GEMTrackerEndcapP_x1/2.0" x2="GEMTrackerEndcapP_x2/2.0" z="GEMTrackerEndcapP_y/2"/>
        <comment>
          Frame disabled as it gives issue with the ACTS geometry conversion
        <frame material="G10" thickness="GEMTrackerEndcapFrame_thickness" vis="TrackerSupportVis">
          <position x="0"  y="0" z="0" />
          <trd x1="GEMTrackerEndcapP_x1/2.0 - GEMTrackerEndcapFrameSideEdge_width/cos(GEMTrackerEndcapOpeningAngle) 
                                              + GEMTrackerEndcapFrameBotEdge_width*tan(GEMTrackerEndcapOpeningAngle)"
               x2="GEMTrackerEndcapP_x2/2.0 - GEMTrackerEndcapFrameSideEdge_width/cos(GEMTrackerEndcapOpeningAngle)
                                              - GEMTrackerEndcapFrameTopEdge_width*tan(GEMTrackerEndcapOpeningAngle)"
               z="GEMTrackerEndcapP_y/2    - (GEMTrackerEndcapFrameBotEdge_width +GEMTrackerEndcapFrameTopEdge_width)/2.0 ">
            <position x="0" y="0" z="0" />
          </trd>
        </frame>
        </comment>
        <comment> Going from HV side to readout side</comment>
	      <module_component thickness="25.0*um" material="Mylar" name="entrance_window" vis="TrackerLayerVis"/>
	      <module_component thickness=" 2.0*mm" material="Ar10CO2" name="entrance_region" />
        <module_component thickness="50.0*um" material="Kapton" name="cathode_foil"/>
	      <module_component thickness=" 5.0*um" material="Copper" name="cathode_cu"/>
        <module_component thickness=" 3.0*mm" material="Ar10CO2" sensitive="true" name="drift_region" vis="AnlProcess_Blue"/>
        <module_component thickness="GEMAreaFactor*50.0*um" material="Kapton"  name="gem_foil_1"/>
        <module_component thickness="GEMAreaFactor*10.0*um" material="Copper"  name="gem_foil_1_cu"/>
        <module_component thickness=" 2.0*mm" material="Ar10CO2" name="transfer_region_I"/>
        <module_component thickness="GEMAreaFactor*50.0*um" material="Kapton"  name="gem_foil_2"/>
        <module_component thickness="GEMAreaFactor*10.0*um" material="Copper"  name="gem_foil_2_cu"/>
        <module_component thickness=" 2.0*mm" material="Ar10CO2" name="transfer_region_II"/>
        <module_component thickness="GEMAreaFactor*50.0*um" material="Kapton"  name="gem_foil_3"/>
        <module_component thickness="GEMAreaFactor*10.0*um" material="Copper"  name="gem_foil_3_cu"/>
        <module_component thickness=" 2.0*mm" material="Ar10CO2" name="induction_region"/>
        <module_component thickness="50.0*um" material="Kapton"  name="readout_foil"/>
	      <module_component thickness=" 5.0*um" material="Copper"  name="readout_cu"/>
	      <module_component thickness=" 2.0*mm" material="Ar10CO2" name="exit_region"/>
        <module_component thickness="25.0*um" material="Mylar" name="exit_window" vis="TrackerLayerVis"/>
      </module>
      <module name="GEMSupportSpokes" vis="TrackerSupportVis">
        <trd x1="GEMTrackerEndcapFrameSideEdge_width" x2="GEMTrackerEndcapFrameSideEdge_width" z="GEMTrackerEndcapP_y/2"/>
        <module_component thickness="1.0*mm" material="Mylar" vis="TrackerSupportVis"/>
      </module>
      <layer id="1" >
        <envelope vis="AnlRed"
          rmin = "GEMTrackerEndcapP_rmin"
          rmax = "GEMTrackerEndcapP_rmax"
          length="GEMTrackerEndcapP_thickness"
          zstart="GEMTrackerEndcapP_zmin" />
        <ring vis="AnlRed" module="GEMModule1"
          r="GEMTrackerEndcapP_rmin+GEMTrackerEndcapP_y/2.0"
          zstart="0"
          nmodules="12" dz="GEMTrackerEndcap_dz" />
        <ring vis="AnlBlue" phi0="GEMTrackerEndcapOpeningAngle/2."  module="GEMSupportSpokes"
          r="GEMTrackerEndcapP_rmin+GEMTrackerEndcapP_y/2.0"
          zstart="0"
          nmodules="12" dz="0*mm" />
      </layer>
    </detector>

    <detector
      id="GEMTrackerEndcapN_ID"
      name="GEMTrackerEndcapN"
      type="athena_GEMTrackerEndcap"
      readout="GEMTrackerEndcapHits"
      vis="AnlRed"
      reflect="true">
      <module name="GEMModule1" vis="TrackerLayerVis">
        <trd x1="GEMTrackerEndcapN_x1/2.0" x2="GEMTrackerEndcapN_x2/2.0" z="GEMTrackerEndcapN_y/2"/>
        <comment>
          Frame disabled as it gives issue with the ACTS geometry conversion
        <frame material="G10" thickness="GEMTrackerEndcapFrame_thickness" vis="TrackerSupportVis">
          <position x="0"  y="0" z="0" />
          <trd x1="GEMTrackerEndcapN_x1/2.0 - GEMTrackerEndcapFrameSideEdge_width/cos(GEMTrackerEndcapOpeningAngle) 
                                              + GEMTrackerEndcapFrameBotEdge_width*tan(GEMTrackerEndcapOpeningAngle)"
               x2="GEMTrackerEndcapN_x2/2.0 - GEMTrackerEndcapFrameSideEdge_width/cos(GEMTrackerEndcapOpeningAngle)
                                              - GEMTrackerEndcapFrameTopEdge_width*tan(GEMTrackerEndcapOpeningAngle)"
               z="GEMTrackerEndcapN_y/2    - (GEMTrackerEndcapFrameBotEdge_width +GEMTrackerEndcapFrameTopEdge_width)/2.0 ">
            <position x="0" y="0" z="0" />
          </trd>
        </frame>
        </comment>
        <comment> Going from HV side to readout side</comment>
	      <module_component thickness="25.0*um" material="Mylar" name="entrance_window"/>
	      <module_component thickness=" 2.0*mm" material="Ar10CO2" name="entrance_region" />
        <module_component thickness="50.0*um" material="Kapton" name="cathode_foil"/>
	      <module_component thickness=" 5.0*um" material="Copper" name="cathode_cu"/>
        <module_component thickness=" 3.0*mm" material="Ar10CO2" sensitive="true" name="drift_region" vis="AnlProcess_Blue"/>
        <module_component thickness="GEMAreaFactor*50.0*um" material="Kapton"  name="gem_foil_1"/>
        <module_component thickness="GEMAreaFactor*10.0*um" material="Copper"  name="gem_foil_1_cu"/>
        <module_component thickness=" 2.0*mm" material="Ar10CO2" name="transfer_region_I"/>
        <module_component thickness="GEMAreaFactor*50.0*um" material="Kapton"  name="gem_foil_2"/>
        <module_component thickness="GEMAreaFactor*10.0*um" material="Copper"  name="gem_foil_2_cu"/>
        <module_component thickness=" 2.0*mm" material="Ar10CO2" name="transfer_region_II"/>
        <module_component thickness="GEMAreaFactor*50.0*um" material="Kapton"  name="gem_foil_3"/>
        <module_component thickness="GEMAreaFactor*10.0*um" material="Copper"  name="gem_foil_3_cu"/>
        <module_component thickness=" 2.0*mm" material="Ar10CO2" name="induction_region"/>
        <module_component thickness="50.0*um" material="Kapton"  name="readout_foil"/>
	      <module_component thickness=" 5.0*um" material="Copper"  name="readout_cu"/>
	      <module_component thickness=" 2.0*mm" material="Ar10CO2" name="exit_region"/>
        <module_component thickness="25.0*um" material="Mylar" name="exit_window"/>
      </module>
      <module name="GEMSupportSpokes" vis="TrackerSupportVis">
        <trd x1="GEMTrackerEndcapFrameSideEdge_width" x2="GEMTrackerEndcapFrameSideEdge_width" z="GEMTrackerEndcapN_y/2"/>
        <module_component thickness="1.0*mm" material="Mylar" vis="TrackerSupportVis"/>
      </module>
      <layer id="1" >
        <envelope vis="AnlRed"
          rmin = "GEMTrackerEndcapN_rmin"
          rmax = "GEMTrackerEndcapN_rmax"
          length="GEMTrackerEndcapN_thickness"
          zstart="GEMTrackerEndcapN_zmin" />
        <ring vis="AnlRed" module="GEMModule1"
          r="GEMTrackerEndcapN_rmin+GEMTrackerEndcapN_y/2.0"
          zstart="0.1"
          nmodules="12" dz="GEMTrackerEndcap_dz" />
        <ring vis="AnlBlue" phi0="GEMTrackerEndcapOpeningAngle/2."  module="GEMSupportSpokes"
          r="GEMTrackerEndcapN_rmin+GEMTrackerEndcapN_y/2.0"
          zstart="0.1"
          nmodules="12" dz="0*mm" />
      </layer>
    </detector>
  </detectors>

  <readouts>
    <readout name="GEMTrackerEndcapHits">
      <segmentation type="CartesianGridXZ" grid_size_x="50*um" grid_size_z="250*um" />
      <id>system:8,barrel:2,layer:4,module:12,sensor:2,x:32:-16,z:-16</id>
    </readout>
  </readouts>

  <plugins>
  </plugins>

  <fields>
  </fields>
</lccdd>