Resolve "Re-scale the dRICH"

Closes #10 (closed)

Notes:

• this is an initial re-scale of the dRICH geometry to be as close to the ECCE design as possible
• small changes to geometry and material properties from athena branch 144-irt-geometry have been implemented
• snout length is a few cm shorter than the ECCE design, to avoid overlap with a beamline component
• there are still some overlaps between the dRICH vessel and these other volumes (it may be too early to try to fix these):
  • world_volume/ECalBarrel_envelope
  • world_volume/FakeDIRC
  • world_volume/ForwardBackwardTrackerSubAssembly/ForwardGEM/ForwardGEM_layer1

compact/definitions.xml

@@ -419,7 +419,7 @@ Examples:
     </documentation>
 
     <constant name="CentralTrackingRegion_rmax"   value="950.0*mm" />
-    <constant name="CentralTrackingRegionP_zmax"  value="1700.0*mm" />
+    <constant name="CentralTrackingRegionP_zmax"  value="1600.0*mm" />
     <constant name="CentralTrackingRegionN_zmax"  value="1500.0*mm" />
     <constant name="CentralTrackingRegion_length" value="CentralTrackingRegionP_zmax + CentralTrackingRegionN_zmax" />
     <comment>
@@ -435,7 +435,7 @@ Examples:
 
     <comment> Global PID regions with suballocations for TOF and RICH detectors </comment>
     <constant name="ForwardPIDRegion_zmin"        value="CentralTrackingRegionP_zmax" />
-    <constant name="ForwardPIDRegion_length"      value="160.0*cm" />
+    <constant name="ForwardPIDRegion_length"      value="120.0*cm" />
 
     <comment> Forward TOF region currenlty empty for future upgrades </comment>
     <constant name="ForwardTOFRegion_zmin"        value="ForwardPIDRegion_zmin" />