det.xml

<?xml version="1.0" encoding="UTF-8"?>
<lccdd>

  <info name="DriftChamber"
    title="Test with Drift Chamber"
    author="Tao Lin"
    url="http://github.com/cepc/CEPCSW"
    status="development"
    version="v0">
    <comment>Test with Drift Chamber</comment>
  </info>

  <includes>
    <gdmlFile  ref="elements.xml"/>
    <gdmlFile  ref="materials.xml"/>
  </includes>

  <define>
    <constant name="world_size" value="30*m"/>
    <constant name="world_x" value="world_size"/>
    <constant name="world_y" value="world_size"/>
    <constant name="world_z" value="world_size"/>

    <!-- SDT -->
    <constant name="SDT_radius_min" value="235*mm"/>
    <constant name="SDT_radius_max" value="1716*mm"/>
    <constant name="SDT_half_length" value="2225*mm"/>
    <constant name="SDT_length" value="SDT_half_length*2"/>

    <constant name="SDT_inner_chamber_radius_min" value="SDT_radius_min"/>
    <constant name="SDT_inner_chamber_radius_max" value="909*mm"/>
    <constant name="SDT_inner_chamber_length" value="SDT_length"/>

    <constant name="SDT_outer_chamber_radius_min" value="1085*mm"/>
    <constant name="SDT_outer_chamber_radius_max" value="SDT_radius_max"/>
    <constant name="SDT_outer_chamber_length" value="SDT_length"/>

    <constant name="SDT_inner_chamber_layer_number" value="67"/>
    <constant name="SDT_outer_chamber_layer_number" value="63"/>
    <constant name="SDT_chamber_layer_width" value="10*mm"/>

  </define>

  <display>
    <vis name="Invisible" showDaughters="false" visible="false"/>
    <vis name="InvisibleWithChildren" showDaughters="true" visible="false"/>
    <vis name="VisibleRed"  r="1.0" g="0.0" b="0.0" showDaughters="true" visible="true"/>
    <vis name="VisibleBlue" r="0.0" g="0.0" b="1.0" showDaughters="false" visible="true"/>
    <vis name="VisibleGreen" alpha="1.0" r="0.0" g="1.0" b="0.0" drawingStyle="solid" lineStyle="solid" showDaughters="true" visible="true"/>
  </display>

  <detectors>
    <detector id="1" name="DriftChamber" type="DriftChamber" readout="DriftChamberHitsCollection" vis="VisibleBlue" sensitive="true">
      <!-- Use cm as unit if you want to use Pandora for reconstruction -->
     </detector>
  </detectors>

  <readouts>
    <readout name="DriftChamberHitsCollection">
      <segmentation type="GridDriftChamber" delta_phi="8*deg" identifier_phi="phi"/>

      <id>system:8,chamber:1,layer:8,phi:16</id>
    </readout>
  </readouts>

  <fields>

    <field name="MagnetFields_Constant" type="ConstantField" field="magnetic">
      <strength x="0" y="0" z="3.0*tesla"/>
    </field>

  </fields>

</lccdd>