SIMULATION OF GEM DETECTORS IN CMS. Sunanda Banerjee, HENPP, SINP Supratik Mukhopadhyay, ANPD, SINP Nayana Majumdar, ANPD, SINP
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1 SIMULATION OF GEM DETECTORS IN CMS Sunanda Banerjee, HENPP, SINP Supratik Mukhopadhyay, ANPD, SINP Nayana Majumdar, ANPD, SINP
2 India-CMS Meeting, SINP 2 GEMs for CMS A CMS GEM End-cap system has been proposed Improved rate capability in the high eta region Robust and redundant tracking capability Improved momentum resolution and trigger efficiency considering long-term operation
3 India-CMS Meeting, SINP 3 GEM End-cap GE1/1 in YE1 nose GE2/1 on back of YE1
4 India-CMS Meeting, SINP 4 Integration studies GE1/1 positioning in YE1 nose Integration studies show there is enough space to insert overlapping sandwiches of two Triple- GEM detectors (Super- Chambers)
5 India-CMS Meeting, SINP 5 Engineering drawing Two versions for straight and pivoting superchambers Most of the details are already there including electronics and cooling sub-systems Changes being made regularly Shown segmentation has six h sectors We expect new versions incorporating eight and ten sectors
6 India-CMS Meeting, SINP 6 Simulation goal To develop GEANT and CMSSW tools for full simulation of GEM system within CMS upgrade Geometry Simulation Geometry, DetID, DIGI Geometry, long term support Standalone Simulation Garfield/GEANT4 based for understanding the detector performance and response Direct link with the digitization task Digitization Follows upon digi geometry task Creation of necessary producers, digitization models, and data Formats Simulation Validation and Tuning Sample creation, basic validation of SimHits, rechits etc. Standard plots for comparing response in data and simulation (standalone and the CMSSW) Liaison to the Test Beam data analysis effort
7 India-CMS Meeting, SINP 7 Starting point Engineering design for the detectors. Engineering design for integration. Started off in mid Existing mf.xml was found to be a rather complicated affair 72 pages of postscript file No algorithm Hard-coding all around the place Information of all the detectors in one place Streamlining was the need of the day.
8 India-CMS Meeting, SINP 8 Mf.xml
9 India-CMS Meeting, SINP 9 Present form Old mf.xml has been modified to a very great extent and split to make the scheme transparent and maintainable. The new files are csc.xml, gemf.xml, mf.xml, mfshield.xml and rpcf.xml.
10 India-CMS Meeting, SINP 10 Constants <?xml version="1.0"?> <DDDefinition xmlns=" xmlns:xsi=" xsi:schemalocation=" "> <ConstantsSection label="gemf.xml" eval="true"> <Constant name="dztot" value="50.820*cm"/> <Constant name="rpos" value="(1338*mm+[dztot])"/> <Constant name="dzs1" value="6.8804*cm"/> <Constant name="dzs2" value="8.4832*cm"/> <Constant name="dzs3" value="5.3262*cm"/>
11 India-CMS Meeting, SINP 11 Materials <MaterialSection label="gemf.xml"> <CompositeMaterial name="m_rdout_brd" density="1.79*g/cm3" symbol=" " method="mixture by weight"> <MaterialFraction fraction=" "> <rmaterial name="materials:g10"/> </MaterialFraction> <MaterialFraction fraction=" "> <rmaterial name="materials:copper"/> </MaterialFraction> </CompositeMaterial> <CompositeMaterial name="m_kapton_cu" density="1.24*g/cm3" symbol=" " method="mixture by weight"> <MaterialFraction fraction="0.9836"> <rmaterial name="materials:kapton"/> </MaterialFraction> <MaterialFraction fraction="0.0164"> <rmaterial name="materials:copper"/> </MaterialFraction> </CompositeMaterial>
12 India-CMS Meeting, SINP 12 Solids <SolidSection label="gemf.xml"> <Tubs name="ge11" rmin="1.3*m " rmax="2.51*m " dz="4.5*cm " startphi="0*deg" deltaphi="360*deg"/> <Trd1 name="gb11" dz="52.850*cm" dy1="7.600*mm" dy2="7.600*mm" dx1="17.227*cm" dx2="26.483*cm" /> <Trd1 name="ga11" dz="52.850*cm" dy1="4.500*mm" dy2="4.500*mm" dx1=" 9.411*cm" dx2="15.573*cm" /> <Trd1 name="gaax" dz="52.850*cm" dy1="4.000*mm" dy2="4.000*mm" dx1=" 8.910*cm" dx2="15.072*cm" /> <Trd1 name="gtax" dz="52.850*cm" dy1="0.500*mm" dy2="0.500*mm" dx1=" 8.910*cm" dx2="15.072*cm" /> <Trd1 name="gmax" dz="51.976*cm" dy1="5.500*mm" dy2="5.500*mm" dx1="16.312*cm" dx2="25.390*cm" />
13 India-CMS Meeting, SINP 13 Logical volumes <LogicalPartSection label="gemf.xml"> <LogicalPart name="ge11p" category="unspecified"> <rsolid name="ge11"/> <rmaterial name="materials:me_free_space"/> </LogicalPart> <LogicalPart name="ge11n" category="unspecified"> <rsolid name="ge11"/> <rmaterial name="materials:me_free_space"/> </LogicalPart> <LogicalPart name="ga11" category="unspecified"> <rsolid name="ga11"/> <rmaterial name="materials:aluminium"/> </LogicalPart>
14 India-CMS Meeting, SINP 14 Positioning <PosPartSection label="gemf.xml"> <PosPart copynumber="1"> <rparent name="mf:me1ringp"/> <rchild name="gemf:ge11p"/> <Translation x="0*fm" y="0*fm" z="5.686*m" /> </PosPart> <PosPart copynumber="1"> <rparent name="mf:me1ringn"/> <rchild name="gemf:ge11n"/> <Translation x="0*fm" y="0*fm" z="5.686*m" /> </PosPart> <PosPart copynumber="1"> <rparent name="gemf:ga11"/> <rchild name="gemf:gaax"/> <Translation x="0*fm" y="-0.5*mm" z="0*fm" /> </PosPart>
15 India-CMS Meeting, SINP 15 Algorithms <Algorithm name="muon:ddgemangular"> <rparent name="gemf:ge11p"/> <String name="childname" value="gb11"/> <String name="rotnamespace" value="gemf"/> <Numeric name="n" value="18"/> <Numeric name="startcopyno" value="2"/> <Numeric name="incrcopyno" value="2"/> <Numeric name="invert" value="0"/> <Numeric name="stepangle" value="20*deg"/> <Numeric name="startangle" value="0*deg"/> <Numeric name="rposition" value="[rpos]"/> <Numeric name="zoffset" value="+34.80*mm"/> </Algorithm>
16 India-CMS Meeting, SINP 16 How to Packages being used for validation at present: cmsrel CMSSW_6_0_1_PostLS1v2_patch2 cd CMSSW_6_0_1_PostLS1v2_patch2/src/ cmsenv cvs co -r V DataFormats/MuonDetId cvs co -r V Geometry/CMSCommonData cvs co -r V Geometry/ForwardCommonData cvs co -r V Geometry/HcalCommonData cvs co -r V Geometry/MuonCommonData cvs co -r V Geometry/MuonNumbering cvs co -r V Geometry/MuonSimData cvs co -r V SimG4CMS/Calo cvs co -r V SimG4CMS/Muon cvs co -r V SimG4CMS/ShowerLibraryProducer cvs co -r V SimG4Core/Application cvs co -r V Geometry/CommonDetUnit cvs co -r V Geometry/GEMGeometry cvs co -r V Geometry/GEMGeometryBuilder cvs co -r V Geometry/Records cvs co -r V d RPCGEM/GEMValidation UserCode/RPCGEM/GEMValidation cvs co -r V SimMuon/GEMDigitizer cvs co -r V DataFormats/GEMDigi scram b -j 8
17 India-CMS Meeting, SINP 17 How to Detailed instructions about the validation code can be found at nsinstructionscmssw Location of the GEM simulation twiki mulation Generation of the reconstruction geometry root file: cmsrun \ $CMSSW_RELEASE_BASE/src/Fireworks/Geometry/python/dump SimGeometry_cfg.py Viewing the geometry: cmsshow --sim-geom-file=cmssimgeom-14.root
18 India-CMS Meeting, SINP 18 Reconstruction geometry Four GEM stations Volume RFAX8 Chimneys and detector volumes
19 India-CMS Meeting, SINP 19 Reconstruction Geometry GEM detector envelopes Overlapped super-chambers GEM detector volume and gas volume of a sector Engineering design has been implemented. Algorithms have been developed and used to conveniently place different components. Initial reconstructions have already been carried out using the reconstruction geometry (current tag ). Several other details are being implemented. Updates will be implemented when available in the form of engineering drawings.
20 India-CMS Meeting, SINP 20 Present status The simulation geometry for GEM exists only for GE11. The constants used in the geometry definition are still not up-to-date and some details are missing in GE11 description. Several issues were found initially in the geometry description many of them have already been taken care of and the corrected codes have been committed to the CVS and the tag set has been published Geometry/MuonCommonData V Geometry/GEMGeometry V Reconstruction geometry for GEM has been created and initial validation attempts have been successful.
21 India-CMS Meeting, SINP 21 Future activities We are working on filling in the details as provided in the engineering designs. Geometry updates and availability of new engineering designs will be implemented as soon as they are available. GEM Geometry in CMSSW twiki will be edited and maintained as and when necessary.
22 India-CMS Meeting, SINP 22 THANK YOU ALL!
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