<define>
<constant name="world_side" value="30*m"/>
<constant name="world_x" value="world_side"/>
<constant name="world_y" value="world_side"/>
<constant name="world_z" value="100*m"/>
<constant name="Pi" value="3.14159265359"/>
<constant name="mil" value="0.0254*mm"/>
<constant name="inch" value="2.54*cm"/>
<comment>
------------
Detector IDs
------------
Note about ACTS tracking geometry construction
----------------------------------------------
The tracking surfaces need to be structured in a barrel + endcapP + endcapN where
endcapP/endcapN are the endcaps at positive/negative z values.
See https://acts.readthedocs.io/en/latest/plugins/dd4hep.html for more details.
The tracking geometry needs to be constructed from cylinders from the inside out. For this reason
each layer needs its own subsystem assembly. This increases the number of top level system IDs.
For example the silicon tracker needs 3 IDs for each area (endcap+barrel+endcap) and a subassembly for each
layer. Therefore it needs a minimum of 20 IDs. Therefore we will allocate blocks of ~25 for each major subsystem.
Note, future improvements will likely include a more sophisticated ACTS-dd4hep plugin,
eliminating the need for so many system IDs at construction time.
This barrel/endcap structure needs IDs to be in increasing order going outward.
The space of IDs for the subassemblies starts at (Subassembly_ID*10+101).
The unused IDs below are saved for future use.
</comment>
<comment>
===================
(1-9) Reserved IDs
===================
Unused IDs: 1-9
====================================
(10-24) Interaction region beamline
====================================
Beampipe ID : 10
Unused IDs: 11-24
</comment>
<constant name="BeamPipe_ID" value="10"/>
<comment>
===============================
(25-49) Silicon Vertex Tracker
===============================
SiVertex subsystem ID: 25
Layer 1 subassembly ID: 26
Layer 2 subassembly ID: 27
Layer 3 subassembly ID: 28
Layer 4 subassembly ID: 29
Layer 5 subassembly ID: 30
</comment>
<constant name="VertexBarrel_ID" value="25"/>
<constant name="VertexBarrelSubAssembly_ID" value="26"/>
<constant name="VertexEndcapSubAssembly_ID" value="27"/>
<constant name="VertexEndcapP_ID" value="30"/>
<constant name="VertexEndcapN_ID" value="40"/>
<comment>
Unused values reserved for vertex:
constant name="SiVertexSubAssemblyLayer1_ID" value="121"
constant name="SiVertexSubAssemblyLayer2_ID" value="122"
constant name="SiVertexSubAssemblyLayer3_ID" value="123"
constant name="SiVertexSubAssemblyLayer4_ID" value="124"
constant name="SiVertexSubAssemblyLayer5_ID" value="125"
</comment>
<comment>
===============================
(50-74) Silicon Tracker System
===============================
SiTracker subsystem ID: 50
Layer 1 subassembly ID: 51
Layer 2 subassembly ID: 52
Layer 3 subassembly ID: 53
Layer 4 subassembly ID: 54
Layer 5 subassembly ID: 55
(56-70) etc...
Unused IDs: 71-74
</comment>
<constant name="TrackerBarrelSubAssembly_Inner_ID" value="50"/>
<constant name="TrackerEndcapSubAssembly_Inner_ID" value="51"/>
<constant name="TrackerBarrelSubAssembly_Outer_ID" value="52"/>
<constant name="TrackerEndcapSubAssembly_Outer_ID" value="53"/>
<!--constant name="TrackerSubAssemblyLayer4_ID" value="54"/-->
<!--constant name="TrackerSubAssemblyLayer5_ID" value="55"/-->
<constant name="TrackerBarrel_Inner_ID" value="56"/>
<constant name="TrackerEndcapP_Inner_ID" value="57"/>
<constant name="TrackerEndcapN_Inner_ID" value="58"/>
<constant name="TrackerBarrel_Outer_ID" value="59"/>
<constant name="TrackerEndcapP_Outer_ID" value="60"/>
<constant name="TrackerEndcapN_Outer_ID" value="61"/>
<constant name="TrackerBarrel_Layer3_ID" value="62"/>
<constant name="TrackerEndcapP_Layer3_ID" value="63"/>
<constant name="TrackerEndcapN_Layer3_ID" value="64"/>
<constant name="TrackerBarrel_Layer4_ID" value="65"/>
<constant name="TrackerEndcapP_Layer4_ID" value="66"/>
<constant name="TrackerEndcapN_Layer4_ID" value="67"/>
<constant name="TrackerBarrel_Layer5_ID" value="68"/>
<constant name="TrackerEndcapP_Layer5_ID" value="69"/>
<constant name="TrackerEndcapN_Layer5_ID" value="70"/>
<comment>
===================
(75-84) Barrel Tracker IDs
===================
MMTrackerBarrel ID: 75
RWellTrackerBarrel ID: 76
Unused IDs: 77-89
</comment>
<constant name="MMTrackerBarrel_ID" value="75"/>
<constant name="RWellTrackerBarrel_ID" value="76"/>
<comment>
===================
(85-99) Reserved IDs
===================
Unused IDs: 85-89
TBD
</comment>
<comment>
======================
(90-99) Barrel PID IDs
======================
DIRC subsystem ID: 90
Barrel TRD subsystem ID: 91
Barrel TOF subsystem ID: 92
TOFSubAssembly ID: 93
Unused IDs: 94-99
</comment>
<constant name="BarrelDIRC_ID" value="90"/>
<constant name="BarrelTRD_ID" value="91"/>
<constant name="BarrelTOF_ID" value="92"/>
<constant name="TOFSubAssembly_ID" value="93"/>
<constant name="TOFEndcapSubAssembly_ID" value="94"/>
<comment>
=====================================
(100-109) Electromagnetic Calorimeter
=====================================
ECal subsystem ID: 100
Barrel subassembly ID: 101
EndcapP subassembly ID: 102
EndcapN subassembly ID: 103
Crystal subassembly ID: 104
Barrel2 subassembly ID: 105
Unused IDs: 106-109
</comment>
<constant name="ECalSubAssembly_ID" value="100"/>
<constant name="ECalBarrel_ID" value="101"/>
<constant name="ECalEndcapP_ID" value="102"/>
<constant name="ECalEndcapN_ID" value="103"/>
<constant name="CrystalEndcap_ID" value="104"/>
<constant name="ECalBarrel2_ID" value="105"/>
<comment>
=====================================
(110-119) Hadronic Calorimeter
=====================================
HCal subsystem ID: 110
Barrel subassembly ID: 111
EndcapP subassembly ID: 112
EndcapN subassembly ID: 113
Unused IDs: 115-119
</comment>
<constant name="HCalSubAssembly_ID" value="110"/>
<constant name="HCalBarrel_ID" value="111"/>
<constant name="HCalEndcapP_ID" value="112"/>
<constant name="HCalEndcapN_ID" value="113"/>
<constant name="ci_HCAL_id" value="200"/>
<comment>
=====================================
(120-129) (near) Forward reserved
=====================================
Forwardtracking ID: 120
Forward RICH ID: 121
Unused IDs: 124-129
</comment>
<constant name="ForwardTracking_ID" value="120"/>
<constant name="ForwardRICH_ID" value="121"/>
<constant name="ci_GEM_id" value="122"/>
<constant name="ForwardTRD_ID" value="123"/>
<constant name="GEMTrackerEndcap_ID" value="124"/>
<constant name="GEMTrackerEndcapN_ID" value="125"/>
<constant name="ForwardTOF_ID" value="126"/>
<constant name="BackwardTOF_ID" value="127"/>
<comment>
=====================================
(130-139) Backward reserved
=====================================
Modular RICH ID: 130
Electron Endcap GEM tracking ID: 131
Unused IDs: 132-139
</comment>
<constant name="MRICH_ID" value="130"/>
<constant name="ce_GEM_ID" value="131"/>
<comment>
=====================================
(140-149) Central Magnet
=====================================
Solenoid ID: 140
Solenoid support ID: 141
Solenoid Yoke ID: 142
Unused IDs: 143-149
</comment>
<constant name="Solenoid_ID" value="140"/>
<constant name="SolenoidSupport_ID" value="141"/>
<constant name="SolenoidYoke_ID" value="142"/>
<comment>
=====================================
(150-169) Far Forward Detectors
=====================================
Forward Roman Pot ID: 150
Forward B0 Tracker ID: 151
Zero Degree Cal. Ecal ID: 160
Zero Degree Cal. Hcal ID: 161
</comment>
<constant name="B0Tracker_ID" value="150"/>
<constant name="ForwardRomanPot_Station_1_ID" value="155"/>
<constant name="ForwardRomanPot_Station_2_ID" value="156"/>
<constant name="ForwardRomanPotC_ID" value="157"/>
<constant name="ForwardOffMTracker_ID" value="159"/>
<constant name="ffi_ZDC_ECAL_ID" value="160"/>
<constant name="ffi_ZDC_HCAL_ID" value="161"/>
<comment>
=====================================
(170-189) Forward Beamline Magnets
=====================================
</comment>
<comment>
=====================================
(190-199) Backward Beamline Magnets
=====================================
</comment>
<comment>
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Detector Definition Parameters
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
## Parameter nomenclature
- "rmin", "rmax", "thickness" all refer to the radial direction.
- "zmin", "zmax", "length", "offset" all refer to the z direction.
- Positive and Negative are "EndcapP" and "EndcapN", respectively.
- All values are positive (except offsets, which are positive in the hadron direction, i.e. towards EndCapP).
When refering to a negative endcap z position, the values are
also positive then negated when required. (Many endcap constructions are mirrored,
hence a postive value.)
- We will try to keep the subsystem component name first and the parameter after an "_" (eg, EcalBarrel_length").
TODO: fix parameter naming to be uniform in the above convention.
</comment>
<comment>
==========================
Solenoid Magnet Parameters
==========================
When changing here, also change the include file in athena.xml.
</comment>
<comment>Solenoid option</comment>
<constant name="Solenoid_length" value="3840.0*mm"/>
<constant name="Solenoid_rmin" value="1600.0*mm"/>
<constant name="Solenoid_thickness" value="640*mm"/>
<constant name="Solenoid_offset" value="10*mm"/>
<comment>Helmholtz option</comment>
<comment>
<constant name="Solenoid_length" value="3840.0*mm"/>
<constant name="Solenoid_rmin" value="1655.0*mm"/> <!-- Larger inner bore radius -->
<constant name="Solenoid_thickness" value="640*mm"/>
<constant name="Solenoid_offset" value="10*mm"/>
</comment>
<constant name="Solenoid_rmax" value="Solenoid_rmin + Solenoid_thickness"/>
<constant name="SolenoidBarrel_rmin" value="Solenoid_rmin"/>
<constant name="SolenoidBarrel_length" value="Solenoid_length"/>
<constant name="SolenoidBarrel_zmax" value="Solenoid_length/2.0"/>
<comment>
--------------------------------
Key Central Detector Parameters
--------------------------------
These are needed here to compute the dependent parameters.
</comment>
<constant name="ForwardRICH_length" value="1.1*m"/>
<constant name="ForwardTRD_length" value="10.0*cm"/>
<constant name="ForwardTOF_length" value="3.0*cm"/>
<constant name="BackwardCherenkov_length" value="20.0*cm"/>
<constant name="BackwardTOF_length" value="3.0*cm"/>
<comment> Total length of PID detectors above</comment>
<constant name="ForwardPIDLength" value="ForwardRICH_length + ForwardTRD_length + ForwardTOF_length"/>
<constant name="BackwardPIDLength" value="BackwardCherenkov_length + BackwardTOF_length"/>
<comment> For detectors adjacent to beam pipe.</comment>
<constant name="ForwardPID_rmin" value="Beampipe_rmax + 10*mm"/>
<constant name="ForwardPID_rmin1" value="Beampipe_rmax + 80*mm"/>
<comment> Barrel PID thicknesses</comment>
<comment> Note: ExtraPID has space for DIRC and optional uRWEL layers</comment>
<constant name="BarrelExtraPIDThickness" value="14.0 * cm"/>
<constant name="BarrelTRDThickness" value="1.0 * cm"/>
<constant name="BarrelTOFThickness" value="1.0 * cm"/>
<comment>
============================
Tracking Detector Parameters
============================
Generic tracking space allocations
</comment>
<constant name="ForwardTracking_length" value="0.0*cm"/>
<comment>This compensates for the asymmetry of the setup</comment>
<constant name="BackwardTracking_length" value="7.5*cm"/>
<comment>
-------------------------
GEM Tracker Parameters
-------------------------
</comment>
<constant name="ForwardTrackingGEMLength" value="ForwardTracking_length"/>
<constant name="BackwardTrackingGEMLength" value="BackwardTracking_length"/>
<comment>
-------------------------
Vertex Tracker Parameters
-------------------------
</comment>
<constant name="VertexTrackerBarrel_rmin" value="Beampipe_rmax+5.0*mm"/>
<constant name="VertexTrackerBarrel_rmax" value="200.0*mm"/>
<constant name="VertexTrackerBarrel_length" value="300.0*mm"/>
<constant name="VertexTrackerBarrel_zmax" value="VertexTrackerBarrel_length/2.0"/>
<constant name="VertexTrackerEndcapP_rmax" value="VertexTrackerBarrel_rmax"/>
<constant name="VertexTrackerEndcapN_rmax" value="VertexTrackerBarrel_rmax"/>
<constant name="VertexTrackerEndcapP_rmin" value="Beampipe_rmax+5.0*mm"/>
<constant name="VertexTrackerEndcapN_rmin" value="Beampipe_rmax+5.0*mm"/>
<constant name="VertexTrackerEndcapP_zmax" value="600.0*mm/2.0"/>
<constant name="VertexTrackerEndcapN_zmax" value="600.0*mm/2.0"/>
<comment>
Vertex Tracking Region
</comment>
<constant name="VertexTrackingRegion_length" value="VertexTrackerEndcapP_zmax + VertexTrackerEndcapN_zmax "/>
<constant name="VertexTrackingRegion_zmin" value="VertexTrackingRegion_length/2.0"/>
<constant name="VertexTrackingRegion_rmax" value="VertexTrackingRegion_length/2.0"/>
<comment>Deprecated
name="VertexTrackerOuterRadius" value="VertexTrackerBarrel_rmax"
name="VertexTrackerInnerRadius" value="VertexTrackerBarrel_rmin"
name="VertexTrackerOuterBarrelLength" value="VertexTrackingRegion_length"
</comment>
<comment>
--------------------------
Tracker Detector Parameters
--------------------------
</comment>
<constant name="TrackerBarrel_rmin" value="VertexTrackerBarrel_rmax"/>
<comment> This is just inside of the potential uRWEL detector hugging the DIRC from the inside </comment>
<constant name="TrackerBarrel_rmax" value="78*cm"/>
<constant name="TrackerBarrelOuter_length" value="2600.0*mm"/>
<constant name="TrackerBarrelInner_length" value="VertexTrackingRegion_length"/>
<constant name="TrackerBarrelInner_zmax" value="TrackerBarrelInner_length/2.0"/>
<constant name="TrackerBarrelOuter_zmax" value="TrackerBarrelOuter_length/2.0"/>
<comment> Deprecated
constant name="SiliconTrackerInnerRadius" value="TrackerBarrel_rmin"
constant name="SiliconTrackerInnerBarrelLength" value="TrackerBarrelInner_length"
constant name="SiliconTrackerOuterRadius" value="TrackerBarrel_rmax"
constant name="SiliconTrackerOuterBarrelLength" value="TrackerBarrelOuter_length"
constant name="SiliconTrackerOuterBarrel_zmax" value="TrackerBarrelOuter_length/2.0"
</comment>
<comment>
--------------------------------------------
Central tracking and PID detector boundaries
--------------------------------------------
The central tracking detectors are assumed to be symmtric about the origin.
</comment>
<constant name="BarrelTracking_length" value="TrackerBarrelOuter_length"/>
<constant name="BarrelTracking_rmax" value="TrackerBarrel_rmax"/>
<constant name="BarrelTracking_zmax" value="BarrelTracking_length/2.0"/>
<constant name="BarrelTrackingAndPID_length" value="BarrelTracking_length "/>
<constant name="BarrelTrackingAndPID_rmax" value="BarrelTracking_rmax + BarrelExtraPIDThickness"/>
<constant name="CentralTracking_length" value="BarrelTracking_length + ForwardTracking_length + BackwardTracking_length"/>
<constant name="CentralTracking_rmax" value="TrackerBarrel_rmax"/>
<comment> These are used by ddsim </comment>
<constant name="tracker_region_rmax" value="Solenoid_rmax/2.0"/>
<constant name="tracker_region_zmax" value="Solenoid_length/2.0"/>
<comment>
----------------------
Calorimeter Parameters
----------------------
Note on paramaeterization
The HCal Barrel is outside of the solenoid magnet. However,
there is an option to add some HCal barrel inside the magnet but this
is turned off below.
The space for the calorimeters inside the solenoid is assumed to be fixed by
the solenoid inner diameter/length and by the central tracking and PID outer diameter/length.
Endcaps
The extra HCal endcap lengths are for offsetting the outside endcap surface (zmax) from the
end of the solenoid coils.
</comment>
<comment> these offesets could be implemented differently for clarity. </comment>
<constant name="EcalEndcapPSolenoid_offset" value="800.0*mm" />
<constant name="EcalEndcapNSolenoid_offset" value="-100.0*mm" />
<constant name="HcalEndcapPExtra_length" value="40.0*cm"/>
<constant name="HcalEndcapNExtra_length" value="0.0*cm"/>
<constant name="SolenoidYokeEndcapP_zmin" value="Solenoid_length/2.0 + Solenoid_offset + HcalEndcapPExtra_length"/>
<constant name="SolenoidYokeEndcapN_zmin" value="Solenoid_length/2.0 - Solenoid_offset + HcalEndcapNExtra_length"/>
<constant name="EcalBarrel_rmin" value="BarrelTrackingAndPID_rmax + 35.0 * mm"/>
<constant name="Barrel_rmax" value="Solenoid_rmin - 1.0 *cm "/>
<constant name="Barrel_TotalCalThickness" value="Barrel_rmax - EcalBarrel_rmin"/>
<constant name="EcalBarrel_TotalThickness" value="40.0*cm"/>
<constant name="EcalEndcapP_zmin" value="BarrelTracking_length/2.0 + ForwardTracking_length + ForwardPIDLength"/>
<constant name="EcalEndcapN_zmin" value="BarrelTracking_length/2.0 + BackwardTracking_length + BackwardPIDLength"/>
<constant name="BarrelLength" value="TrackerBarrelOuter_length + ForwardPIDLength + BackwardPIDLength" />
<constant name="Barrel_offset" value="(EcalEndcapP_zmin-EcalEndcapN_zmin)/2.0" />
<comment>
Endcaps
</comment>
<constant name="EndcapPTotalCal_length" value="(SolenoidYokeEndcapP_zmin + EcalEndcapPSolenoid_offset) - (EcalEndcapP_zmin)"/>
<constant name="EndcapNTotalCal_length" value="(SolenoidYokeEndcapN_zmin + EcalEndcapNSolenoid_offset) - (EcalEndcapN_zmin)"/>
<constant name="EndcapP_CalDivide" value="0.8"/> <comment> 0.5 means Ecal and Hcal have the same thickness </comment>
<constant name="EndcapN_CalDivide" value="1.0"/> <comment> 0.5 means Ecal and Hcal have the same thickness </comment>
<constant name="EcalEndcapP_length" value="EndcapPTotalCal_length * EndcapP_CalDivide"/>
<!--constant name="EcalEndcapN_length" value="EndcapNTotalCal_length * EndcapN_CalDivide"/-->
<constant name="EcalEndcapN_length" value="41*cm"/>
<comment> These need to be set in sync with the forward and backward detectors </comment>
<constant name="EcalEndcapP_rmin" value="200.0*mm"/>
<constant name="EcalEndcapN_rmin" value="300.0*mm"/>
<constant name="HcalEndcapP_rmin" value="EcalEndcapP_rmin"/>
<constant name="HcalEndcapN_rmin" value="EcalEndcapN_rmin"/>
<comment>
-------------------------
EM Calorimeter Parameters
-------------------------
## Note about Calormieter parameterization.
The logic goes like this:
1. The space for the calorimeter is fixed via parameterization above.
2. The layer thicknesses are fixed (first parameters below)
3. From the space/thickness the number of layers is computed.
</comment>
<constant name="CaloSides" value="12"/>
<comment>Material Thickness</comment>
<constant name="EcalSiliconThickness" value="9.00 * mm" />
<constant name="EcalCopperThickness" value="0.05 * mm" />
<constant name="EcalKaptonThickness" value="0.30 * mm" />
<constant name="EcalAir1Thickness" value="0.33 * mm" />
<constant name="EcalAir2Thickness" value="0.25 * mm" />
<constant name="EcalThinTungstenThickness" value="2.50 * mm" />
<constant name="EcalThickTungstenThickness" value="5.00 * mm" />
<comment> Layer Thickness </comment>
<constant name="EcalLayer1_thickness"
value="EcalSiliconThickness + EcalCopperThickness + EcalKaptonThickness + EcalAir1Thickness"/>
<constant name="EcalLayer2_thickness"
value="EcalThinTungstenThickness + EcalAir2Thickness + EcalSiliconThickness + EcalCopperThickness + EcalKaptonThickness + EcalAir1Thickness"/>
<constant name="EcalLayer3_thickness"
value="EcalThickTungstenThickness + EcalAir2Thickness + EcalSiliconThickness + EcalCopperThickness + EcalKaptonThickness + EcalAir1Thickness"/>
<comment> EM Barrel N Layer; same number of layers for EcalThin and EcalThick</comment>
<constant name="EcalBarrelLayers"
value="floor((EcalBarrel_TotalThickness - EcalLayer1_thickness) / (EcalLayer2_thickness + EcalLayer3_thickness))"/>
<constant name="EcalBarrelLayer1_NRepeat" value="1"/>
<constant name="EcalBarrelLayer2_NRepeat" value="EcalBarrelLayers"/>
<constant name="EcalBarrelLayer3_NRepeat" value="EcalBarrelLayers"/>
<comment> EM Barrel Thickness </comment>
<constant name="EcalBarrelThickness"
value="EcalBarrelLayer1_NRepeat*EcalLayer1_thickness + EcalBarrelLayer2_NRepeat * EcalLayer2_thickness + EcalBarrelLayer3_NRepeat * EcalLayer3_thickness"/>
<constant name="EcalBarrel_rmax" value="EcalBarrel_rmin + EcalBarrelThickness"/>
<comment> EM Endcap N Layer; same number of layers for EcalThin and EcalThick </comment>
<constant name="EcalEndcapPLayers"
value="floor((EcalEndcapP_length - EcalLayer1_thickness) / (EcalLayer2_thickness + EcalLayer3_thickness))"/>
<constant name="EcalEndcapNLayers"
value="floor((EcalEndcapN_length - EcalLayer1_thickness) / (EcalLayer2_thickness + EcalLayer3_thickness))"/>
<constant name="EcalEndcapPLayer1_NRepeat" value="1"/>
<constant name="EcalEndcapNLayer1_NRepeat" value="1"/>
<constant name="EcalEndcapPLayer2_NRepeat" value="EcalEndcapPLayers"/>
<constant name="EcalEndcapPLayer3_NRepeat" value="EcalEndcapPLayers"/>
<constant name="EcalEndcapNLayer2_NRepeat" value="EcalEndcapNLayers"/>
<constant name="EcalEndcapNLayer3_NRepeat" value="EcalEndcapNLayers"/>
<comment> EM Endcap Thickness </comment>
<constant name="EcalEndcapPThickness"
value="EcalEndcapPLayer1_NRepeat*EcalLayer1_thickness + EcalEndcapPLayer2_NRepeat*EcalLayer2_thickness + EcalEndcapPLayer3_NRepeat*EcalLayer3_thickness "/>
<constant name="EcalEndcapNThickness"
value="EcalEndcapNLayer1_NRepeat*EcalLayer1_thickness + EcalEndcapNLayer2_NRepeat*EcalLayer2_thickness + EcalEndcapNLayer3_NRepeat*EcalLayer3_thickness"/>
<constant name="EcalBarrel_length" value="CentralTracking_length + BackwardPIDLength + EcalEndcapNThickness - 10*cm"/>
<constant name="EcalBarrel_offset" value="(CentralTracking_length - EcalBarrel_length)/2.0"/>
<comment>
-------------------------------
Hadronic Calorimeter Parameters
-------------------------------
</comment>
<constant name="HcalEndcapP_length" value="100.0*cm"/>
<constant name="HcalEndcapN_length" value="75.0*cm"/>
<constant name="HcalBarrel_thickness" value="100.0*cm "/>
<constant name="HcalBarrel_rmin" value="Solenoid_rmax"/>
<constant name="HcalBarrel_rmax" value="HcalBarrel_rmin + HcalBarrel_thickness"/>
<constant name="HcalBarrelAvailThickness" value="HcalBarrel_thickness"/>
<constant name="HcalEndcapP_zmin" value="max(EcalEndcapP_zmin + EcalEndcapP_length, Solenoid_length / 2.0 + Solenoid_offset) "/>
<constant name="HcalEndcapN_zmin" value="max(EcalEndcapN_zmin + EcalEndcapN_length, Solenoid_length / 2.0 - Solenoid_offset) "/>
<constant name="HcalBarrelLength" value="HcalEndcapP_zmin + HcalEndcapN_zmin "/>
<comment> Material Thickness </comment>
<constant name="HcalSteelThickness" value="1.89 * cm"/>
<constant name="HcalPyrexThickness" value="1.10 * mm"/>
<constant name="HcalRPCGasThickness" value="1.20 * mm"/>
<constant name="HcalG10Thickness" value="3.00 * mm"/>
<constant name="HcalAirThickness" value="1.60 * mm"/>
<comment> Single Layer Thickness (for both barrel and endcap)</comment>
<constant name="HcalSingleLayerThickness"
value="HcalSteelThickness + (2 * HcalPyrexThickness) + HcalRPCGasThickness + HcalG10Thickness + HcalAirThickness"/>
<comment> Hcal Barrel Layers and computed Thickness </comment>
<constant name="HcalBarrelLayer_NRepeat" value="floor(HcalBarrelAvailThickness / HcalSingleLayerThickness)"/>
<constant name="HcalBarrelThickness" value="HcalBarrelLayer_NRepeat * HcalSingleLayerThickness"/>
<comment> Hcal Endcap Layers and computed Thickness </comment>
<constant name="HcalEndcapPLayer_NRepeat" value="floor(HcalEndcapP_length / HcalSingleLayerThickness)"/>
<constant name="HcalEndcapNLayer_NRepeat" value="floor(HcalEndcapN_length / HcalSingleLayerThickness)"/>
<constant name="HcalEndcapP_thickness" value="HcalEndcapPLayer_NRepeat * HcalSingleLayerThickness"/>
<constant name="HcalEndcapN_thickness" value="HcalEndcapNLayer_NRepeat * HcalSingleLayerThickness"/>
<comment>
----------------------
DIRC parameters
----------------------
</comment>
<constant name="DIRCLength" value="CentralTracking_length + BackwardPIDLength"/>
<constant name="DIRCOffset" value="(CentralTracking_length - DIRCLength)/2.0"/>
<comment>
-----------------------
Gaseous RICH Parameters
-----------------------
</comment>
<comment>
--------------------------
Forward Tracker Parameters
--------------------------
</comment>
<comment>
--------------------------
Forward ECal Parameters
--------------------------
</comment>
<comment>
--------------------------
Forward HCal Parameters
--------------------------
</comment>
<comment>
--------------------------
Central Ion HCal Parameters
--------------------------
</comment>
<constant name="ci_HCAL_rin" value="90 * cm"/><comment> Orginally 0, changed to not overlap solenoid </comment>
<constant name="ci_HCAL_rout" value="300 * cm"/>
<constant name="ci_HCAL_sizez" value="160 * cm"/>
<constant name="ci_HCAL_shiftz" value="5 * cm"/>
<constant name="ci_HCAL_posz" value="0 * cm"/>
<constant name="ci_HCAL_nlayers" value="20"/>
<constant name="ci_HCAL_lay_rin" value="ci_HCAL_rin"/> <comment> Orginally 80cm, changed to not overlap solenoid </comment>
<constant name="ci_HCAL_lay_rout" value="ci_HCAL_rout - 1 * cm"/>
<constant name="ci_HCAL_lay_thickness" value="2* cm"/>
<constant name="ci_HCAL_lay_gapz" value="2* cm"/>
<comment>
--------------------------
Central Ion GEM Parameters
--------------------------
</comment>
<constant name="ci_GEM_rin" value="10 * cm"/>
<constant name="ci_GEM_rout" value="95 * cm"/>
<constant name="ci_GEM_sizez" value="30 * cm"/>
<constant name="ci_GEM_shiftz" value="0 * cm"/>
<constant name="ci_GEM_posz" value="0 * cm"/>
<constant name="ci_GEM_posx" value="0 * cm"/>
<constant name="ci_GEM_nlayers" value="8"/>
</define>