<!-- Define parameter -->
  <define>
    <constant name="world_side" value="50*m"/>
    <constant name="world_x"    value="world_side"/>
    <constant name="world_y"    value="world_side"/>
    <constant name="world_z"    value="world_side"/>

    <constant name="tracker_region_zmax" value="6 * m"/>
    <constant name="tracker_region_rmax" value="6 * m"/>

    <constant name="cb_Solenoid_ID"    value="1"/>
    <constant name="cb_Solenoid_rmin"  value="0.0 * cm"/>   <!-- Central Barrel Solenoid Inner diameter -->
    <constant name="cb_Solenoid_rmax"  value="137.0 * cm"/> <!-- Central Barrel Solenoid Outer diameter -->
    <constant name="cb_Solenoid_z"     value="400.0 * cm"/> <!-- Central Barrel Solenoid Size in Z direction -->
    <constant name="cb_Solenoid_shift" value="0.0 * cm"/>
  </define>