here is the compact XML description for a simple 100 layer W-Scint stack
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<lccdd xmlns:compact="http://www.lcsim.org/schemas/compact/1.0"
xmlns:xs="http://www.w3.org/2001/XMLSchema-instance"
xs:noNamespaceSchemaLocation="http://www.lcsim.org/schemas/compact/1.0/compact.xsd">
<info name="clichcalstack"
title="hcal stack for CLIC leakage tests"
author="Marcel Stanitzki"
url="NONE"
status="development"
version="$Id: compact.xml,v 1.1 2007/09/17 22:10:42 lima Exp $">
</info>
<define>
<constant name="cm" value="10"/>
<!-- world -->
<constant name="world_side" value="5000*cm" />
<constant name="world_x" value="world_side" />
<constant name="world_y" value="world_side" />
<constant name="world_z" value="world_side" />
<!-- tracking region -->
<constant name="tracking_region_radius" value="126.5*cm"/>
<constant name="tracking_region_zmax" value="100.*cm"/>
</define>
<materials>
<material name="TungstenDens23">
<D value="17.7" unit="g/cm3"/>
<fraction n="0.925" ref="W"/>
<fraction n="0.066" ref="Ni"/>
<fraction n="0.009" ref="Fe"/>
</material>
<material name="TungstenDens24">
<D value="17.8" unit="g/cm3"/>
<fraction n="0.93" ref="W"/>
<fraction n="0.061" ref="Ni"/>
<fraction n="0.009" ref="Fe"/>
</material>
<material name="TungstenDens25">
<D value="18.2" unit="g/cm3"/>
<fraction n="0.950" ref="W"/>
<fraction n="0.044" ref="Ni"/>
<fraction n="0.006" ref="Fe"/>
</material>
</materials>
<detectors>
<detector id="1" name="HCAL" type="TestBeamCalorimeter" readout="HCALCalorimeterHits" insideTrackingVolume="false">
<dimensions x="100.0 * cm" y="100.0 * cm" />
<position z="3500" />
<layer repeat="100">
<slice material= "TungstenDens24" thickness= "2.0*cm" />
<slice material= "Polystyrene" thickness= "0.50*cm" sensitive= "yes" />
<slice material= "G10" thickness= "0.25*cm" />
</layer>
</detector>
</detectors>
<!-- Sensitive Detector readout segmentation -->
<readouts>
<readout name="HCALCalorimeterHits">
<segmentation type="GridXYZ" gridSizeX="1.0*cm" gridSizeY="1.0*cm" />
<id>system:8,layer:16,barrel:3,x:32:-16,y:-16</id>
</readout>
</readouts>
<fields>
</fields>
</lccdd>
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This derives from TBCern1006_01 made by Jeremy
A few important things to note
- There is tracking region, where the stack should not get into
- All coordinates refer to the center, so placing e.g. z-200cm with a 100cm deep stack, means, it actually extends from 150 cm to 250 cm
- When reading back the layer number, they are inverted (bug report has been made), so the layer closest to the beam is e.g layer 100 in a 100 layer stack