<?xml version="1.0" encoding="UTF-8"?>
<!--DOCTYPE HDDS>
Hall D Geometry Data Base: Start counter
*****************************************
version 1.0: Initial version -rtj
version 1.1: Fix some problems with the start Detector -cam
Length and center were wrong in the previous version.
version 2.0: template file, start counter parameters calculated
DO NOT EDIT THIS FILE !!! W. Boeglin January 09
<HDDS specification="v1.0" xmlns="http://www.gluex.org/hdds">
-->
<section name = "StartCntr"
version = "4"
date = "2009-02-04"
author = "W. Boeglin"
top_volume = "STRT"
specification = "v1.0">
<!-- Origin of StartCntr is on the axis of the cylinder
at the upstream limit of the sensitive region. -->
<composition name="StartCntr">
<posXYZ volume="startCntr" X_Y_Z="0.0 0.0 0.0" />
</composition>
<composition name="startCntr" envelope="STRT">
<mposPhi volume="STRC" ncopy="40" Phi0="4.500000" R_Z="0.0 0.0"
impliedRot="true">
<sector value="1" step="1" />
</mposPhi>
<posXYZ volume="STIS" />
<posXYZ volume="STOS" />
<posXYZ volume="STWR" />
<posXYZ volume="startCntrSupport" X_Y_Z="0.0 0.0 -70.000000" />
</composition>
<composition name="startCntrSupport" envelope="TARM">
<posXYZ volume="STLG" />
</composition>
<tubs name="TARM" Rio_Z="6.921336 8.927521 140.000000" material="Aluminum"
comment="target region support arm" />
<tubs name="STLG" Rio_Z="7.300000 7.800000 140.000000" material="Plexiglas"
comment="start counter light guides" />
<pgon name="STRT" segments="40" material="Air"
comment="start counter assembly">
<polyplane Rio_Z="6.911305 8.937551 -140.010000" />
<polyplane Rio_Z="6.911305 8.937551 49.990000" />
<polyplane Rio_Z="6.907519 8.937551 50.051907" />
<polyplane Rio_Z="6.884555 8.914588 50.427356" />
<polyplane Rio_Z="6.838703 8.899456 50.674755" />
<polyplane Rio_Z="6.804705 8.865458 50.858193" />
<polyplane Rio_Z="6.672943 8.788006 51.276087" />
<polyplane Rio_Z="6.639577 8.774437 51.349302" />
<polyplane Rio_Z="6.491236 8.671805 51.674808" />
<polyplane Rio_Z="6.289760 8.568142 52.003585" />
<polyplane Rio_Z="6.262290 8.547713 52.048412" />
<polyplane Rio_Z="5.856563 8.283648 52.627850" />
<polyplane Rio_Z="5.484013 7.957603 53.159908" />
<polyplane Rio_Z="0.675656 3.149246 60.026953" />
<polyplane Rio_Z="2.335460 2.335460 61.189160" />
</pgon>
<pgon name="STOS" segments="40" material="LowDensityROHACELL"
comment="start counter outer support">
<polyplane Rio_Z="7.924428 8.456067 0.000000" />
<polyplane Rio_Z="7.924428 8.456067 50.000000" />
<polyplane Rio_Z="7.923435 8.456067 50.016243" />
<polyplane Rio_Z="7.890127 8.422759 50.560825" />
<polyplane Rio_Z="7.878096 8.418789 50.625737" />
<polyplane Rio_Z="7.787734 8.328426 51.113290" />
<polyplane Rio_Z="7.747106 8.304544 51.242145" />
<polyplane Rio_Z="7.618775 8.176214 51.649157" />
<polyplane Rio_Z="7.531787 8.116030 51.840036" />
<polyplane Rio_Z="7.385770 7.970014 52.160440" />
<polyplane Rio_Z="7.232536 7.856057 52.410496" />
<polyplane Rio_Z="7.092192 7.715713 52.639516" />
<polyplane Rio_Z="6.887991 7.537002 52.931146" />
<polyplane Rio_Z="1.511294 2.160305 60.609865" />
<polyplane Rio_Z="1.946787 1.946787 60.914801" />
</pgon>
<pgon name="STRC" segments="1" profile="-4.500000 9.000000" material="Scintillator"
sensitive="true" comment="start counter scintillator">
<polyplane Rio_Z="7.322573 7.623501 0.000000" />
<polyplane Rio_Z="7.322573 7.623501 50.000000" />
<polyplane Rio_Z="7.322011 7.623501 50.009194" />
<polyplane Rio_Z="7.292758 7.594248 50.487477" />
<polyplane Rio_Z="7.285948 7.592000 50.524220" />
<polyplane Rio_Z="7.203756 7.509808 50.967688" />
<polyplane Rio_Z="7.180759 7.496290 51.040625" />
<polyplane Rio_Z="7.056895 7.372426 51.433472" />
<polyplane Rio_Z="7.007656 7.338360 51.541516" />
<polyplane Rio_Z="6.854363 7.185067 51.877886" />
<polyplane Rio_Z="6.767627 7.120563 52.019427" />
<polyplane Rio_Z="6.599181 6.952118 52.294306" />
<polyplane Rio_Z="6.483595 6.850960 52.459379" />
<polyplane Rio_Z="1.022298 1.389662 60.258921" />
<polyplane Rio_Z="1.268803 1.268803 60.431526" />
</pgon>
<pgon name="STIS" segments="40" material="HighDensityROHACELL"
comment="start counter support cylinder">
<polyplane Rio_Z="6.921336 7.318561 0.000000" />
<polyplane Rio_Z="6.921336 7.318561 50.000000" />
<polyplane Rio_Z="6.920594 7.318561 50.012136" />
<polyplane Rio_Z="6.894419 7.292386 50.440086" />
<polyplane Rio_Z="6.885430 7.289420 50.488586" />
<polyplane Rio_Z="6.814070 7.218059 50.873612" />
<polyplane Rio_Z="6.783714 7.200216 50.969889" />
<polyplane Rio_Z="6.681486 7.097988 51.294114" />
<polyplane Rio_Z="6.616491 7.053020 51.436732" />
<polyplane Rio_Z="6.498644 6.935174 51.695324" />
<polyplane Rio_Z="6.384152 6.850028 51.882158" />
<polyplane Rio_Z="6.268270 6.734146 52.071260" />
<polyplane Rio_Z="6.115697 6.600619 52.289157" />
<polyplane Rio_Z="0.691387 1.176308 60.035876" />
<polyplane Rio_Z="1.016774 1.016774 60.263714" />
</pgon>
<pgon name="STWR" segments="40" material="Cellulose"
comment="start counter wrapping tape">
<polyplane Rio_Z="7.633501 7.683655 0.000000" />
<polyplane Rio_Z="7.633501 7.683655 50.000000" />
<polyplane Rio_Z="7.633407 7.683655 50.001532" />
<polyplane Rio_Z="7.601368 7.651616 50.525370" />
<polyplane Rio_Z="7.600233 7.651241 50.531494" />
<polyplane Rio_Z="7.505448 7.556456 51.042908" />
<polyplane Rio_Z="7.501615 7.554203 51.055064" />
<polyplane Rio_Z="7.347171 7.399759 51.544898" />
<polyplane Rio_Z="7.338964 7.394082 51.562906" />
<polyplane Rio_Z="7.128896 7.184014 52.023858" />
<polyplane Rio_Z="7.114440 7.173263 52.047448" />
<polyplane Rio_Z="6.853878 6.912701 52.472647" />
<polyplane Rio_Z="6.834614 6.895841 52.500159" />
<polyplane Rio_Z="1.276995 1.338222 60.437262" />
<polyplane Rio_Z="1.318079 1.318079 60.466029" />
</pgon>
<!-- The following elements describe an early rendition of the GlueX
detector simulated using a fast Monte Carlo program MCFast. They
are retained for future reference, do not rely on their values. -->
<parameters name="startCntr_pars" type="mcfast">
<real name="rmin" value="10.00" comment="inner radius"
unit="cm" />
<real name="rmax" value="10.20" comment="outer radius"
unit="cm" />
<real name="z0" value="72.5" comment="z of midplane"
unit="cm" />
<real name="zlen" value="50.0" comment="length of cntr"
unit="cm" />
</parameters>
<parameters name="startCntrLayer_pars" type="mcfast">
<int name="det" value="1" comment="num of mother" />
<real name="zlen" value="50.0" comment="length of layer"
unit="cm" />
<real name="cell_height" value="0.2" comment="thickness"
unit="cm" />
<int name="nwires" value="25" comment="segmentation" />
<int name="ID_readout" value="-1" />
<int name="ID_cathode" value="1" />
<real name="phi0" value="0." comment="offset to wire 1"
unit="cm" />
<real name="stereo_offset" value="0." comment="where is phi0"
unit="cm" />
<real name="eff_hit" value="0.96" comment="hit efficiency"
unit="cm" />
<real name="eff_dedx" value="0.96" comment="dE/dx efficiency"
unit="cm" />
<real name="siga" value="0.04" comment="xy resolution"
unit="cm" />
<real name="sigb" value="0.00" comment="?? resolution"
unit="cm" />
<real name="sigc" value="0.00" comment="?? resolution"
unit="cm" />
</parameters>
<parameters name="startCntrOffset_pars" type="mcfast">
<int name="det" value="1" comment="num of mother" />
<real name="cell_offset" value="0.0" comment="offset in phi"
unit="cm" />
<real name="sag" value="0.0" comment="sagitta of wire"
unit="cm" />
<real_array name="offset" values="0.0 0.0 0.0" comment="not used"
unit="cm" />
<real_array name="dircos" values="0.0 0.0 0.0" comment="not used"
unit="cm" />
</parameters>
<mcfast model="Drift" template="db/drift.db" parameters="startCntr_pars">
<int name="num" value="1" />
<string name="name" value="STRT" />
<!-- for mcfast model the start counter as a vertex drift chamber -->
<int name="num_anode" value="3" comment="anode layers" />
<int name="num_cathode" value="0" />
<reference name="material" value="Scintillator" />
<real_array name="thick_boun" comment="inner outer upstream downstream
window thicknesses" values=" 0.20 0.05 0.20 0.20"
unit="cm" />
<reference_vector name="mat_boun">
<reference_data value="Mylar" comment="inner window material" />
<reference_data value="Mylar" comment="outer window material" />
<reference_data value="Mylar" comment="upstream window matl" />
<reference_data value="Mylar" comment="downstream window matl" />
</reference_vector>
<mcfast model="LayerDRFAno" template="db/drift_layer.db"
parameters="startCntrLayer_pars">
<int name="lyr" value="1" comment="layer number" />
<real name="radius" value="10.1" comment="central radius"
unit="cm" />
<real name="stereo_tau" value="-0.10" comment="twist angle tau"
unit="cm" />
</mcfast>
<mcfast model="LayerDRFAno" template="db/drift_layer.db"
parameters="startCntrLayer_pars">
<int name="lyr" value="2" comment="layer number" />
<real name="radius" value="10.3" comment="central radius"
unit="cm" />
<real name="stereo_tau" value="0.0" comment="twist angle tau"
unit="cm" />
</mcfast>
<mcfast model="LayerDRFAno" template="db/drift_layer.db"
parameters="startCntrLayer_pars">
<int name="lyr" value="3" comment="layer number" />
<real name="radius" value="10.5" comment="central radius"
unit="cm" />
<real name="stereo_tau" value="+0.10" comment="twist angle tau"
unit="cm" />
</mcfast>
<mcfast model="OffsetDRFAno" template="db/drift_offset.db"
parameters="startCntrOffset_pars">
<int name="lyr" value="1" comment="layer number" />
</mcfast>
<mcfast model="OffsetDRFAno" template="db/drift_offset.db"
parameters="startCntrOffset_pars">
<int name="lyr" value="2" comment="layer number" />
</mcfast>
<mcfast model="OffsetDRFAno" template="db/drift_offset.db"
parameters="startCntrOffset_pars">
<int name="lyr" value="3" comment="layer number" />
</mcfast>
</mcfast>
</section>
<!-- </HDDS> -->