remove DriftChamberRegion option

Detector/DetCRD/compact/CRD_common_v01/DC_Simple_v01_02.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<lccdd xmlns:compact="http://www.lcsim.org/schemas/compact/1.0"
+       xmlns:xs="http://www.w3.org/2001/XMLSchema"
+       xs:noNamespaceSchemaLocation="http://www.lcsim.org/schemas/compact/1.0/compact.xsd">
+
+  <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>
+
+  <define>
+
+    <!-- SDT -->
+    <constant name="SDT_radius_min" value="DC_inner_radius"/>
+    <constant name="SDT_radius_max" value="DC_outer_radius"/>
+
+    <constant name="SDT_half_length" value="MainTracker_half_length"/>
+    <constant name="DC_length" value="DC_half_length*2"/>
+    <constant name="SDT_length" value="SDT_half_length*2"/>
+
+    <constant name="SDT_chamber_radius_min" value="DC_chamber_layer_rbegin-DC_safe_distance"/>
+    <constant name="SDT_chamber_radius_max" value="DC_chamber_layer_rend+DC_safe_distance"/>
+    <constant name="SDT_chamber_half_length" value="DC_half_length"/>
+
+    <constant name="SDT_chamber_layer_width" value="10*mm"/>
+    <constant name="SDT_chamber_cell_width" value="10*mm"/>
+    <constant name="Epsilon" value="0*deg"/>
+
+    <constant name="SDT_chamber_inner_wall_radius_min" value="SDT_chamber_radius_min-SDT_inner_wall_thickness"/>
+    <constant name="SDT_chamber_inner_wall_radius_max" value="SDT_chamber_radius_min"/>
+    <constant name="SDT_chamber_outer_wall_radius_min" value="SDT_chamber_radius_max"/>
+    <constant name="SDT_chamber_outer_wall_radius_max" value="SDT_chamber_radius_max+SDT_outer_wall_thickness"/>
+
+    <constant name="DC_Endcap_rmin" value="SDT_radius_min"/>
+    <constant name="DC_Endcap_rmax" value="SDT_radius_max"/>
+
+  </define>
+
+  <limits>
+    <limitset name="DC_limits">
+      <limit name="step_length_max" particles="*" value="10" unit="mm" />
+    </limitset>
+  </limits>
+
+  <regions>
+    <region name="DriftChamberRegion">
+      <limitsetref name="DC_limits"/>
+    </region>
+  </regions>
+
+  <detectors>
+    <detector id="DetID_DC" name="DriftChamber" type="DriftChamber" readout="DriftChamberHitsCollection" vis="DCVis" sensitive="true" insideTrackingVolume="true" limits="DC_limits">
+      <chamber id="0"/>
+      <envelope>
+        <shape type="BooleanShape" operation="Union" material="Air">
+          <shape type="Tube" rmin="SDT_radius_min" rmax="SDT_radius_max" dz="SDT_half_length" />
+        </shape>
+      </envelope>
+
+      <module id="0" name="SignalWire" type="Tube" rmin="0*mm" rmax="0.01*mm" vis="RedVis">
+          <tubs name="W" type="Tube" rmin="0*mm" rmax="0.007*mm" material="Tungsten"/>
+          <tubs name="Au" type="Tube" rmin="0.007*mm" rmax="0.01*mm" material="Gold"/>
+      </module>
+
+      <module id="1" name="FieldWire" type="Tube" rmin="0*mm" rmax="0.02*mm" vis="GreenVis">
+          <tubs name="Al" type="Tube" rmin="0*mm" rmax="0.017*mm" material="Aluminum"/>
+          <tubs name="Ag" type="Tube" rmin="0.017*mm" rmax="0.02*mm" material="Silver"/>
+      </module>
+
+      <type_flags type="DetType_TRACKER + DetType_BARREL + DetType_GASEOUS + DetType_WIRE"/>
+      <!-- Use cm as unit if you want to use Pandora for reconstruction -->
+     <sensitive type="SimpleDriftChamber"/>
+     </detector>
+  </detectors>
+
+  <readouts>
+    <readout name="DriftChamberHitsCollection">
+      <segmentation type="GridDriftChamber" cell_size="SDT_chamber_cell_width" epsilon0="Epsilon" detector_length="DC_length" identifier_phi="cellID" DC_rbegin="DC_chamber_layer_rbegin" DC_rend="DC_chamber_layer_rend" DC_rmin="SDT_chamber_radius_min" DC_rmax="SDT_chamber_radius_max" safe_distance="DC_safe_distance" layerID="layer" layer_width="SDT_chamber_layer_width"/>
+
+      <!-- <id>system:8,chamber:1,layer:8,cellID:16</id> -->
+      <id>system:5,layer:7:9,chamber:8,cellID:32:16</id>
+    </readout>
+  </readouts>
+
+</lccdd>