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Simulation Framework and XML Detector Description for the CMS Experiment

Simulation Framework and XML Detector Description for the CMS Experiment.

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Simulation Framework and XML Detector Description for the CMS Experiment

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  1. Simulation Framework and XML Detector Description for the CMS Experiment ARCE Pedro1,2, BANERJEE Sunanda3, BOCCALI Tomasso4, CASE Michael5, De ROECK Albert2, LARA Vicente2, LIENDL Martin2,6, NIKITENKO Alexander7, SCHRODER Matthias2, STRAESSNER Arno2, Van LINGEN Frank2, WELLISCH Hans-Peter2, WENZEL Hans8 1CIEMAT, Madrid, Spain, 2CERN, Geneva, Switzerland, 3Tata Institute, Bombay, India, 4INFN Bari, Italy, 5UC Davis, USA, 6HEPHY, Vienna, Austria, 7Imperial College, UK, 8Fermilab, Chicago, USA (for the CMS Collaboration) ACAT 2002, Moscow, 23th June 2002 CMS GEANT4 Sim. & Detector Desc.Pedro Arce(CERN/CIEMAT)

  2. Outline • GEANT4 simulation framework (OSCAR) • OSCAR – IGUANA Visualisation • OSCAR Physics comparison • GEANT4 Performance comparison • DDD scope • Basic aspects and architecture • Document structuring • Summary CMS GEANT4 Sim. & Detector Desc.Pedro Arce(CERN/CIEMAT)

  3. CMS Simulation & Reconstruction User Analysis User Analysis ORCA FAMOS CMSIM OODB ZebraFZ CMSjet OSCAR FAMOS CMSIM Ntuple Monte-Carlo generator Monte-Carlo generator CMS GEANT4 Sim. & Detector Desc.Pedro Arce(CERN/CIEMAT)

  4. GEANT4 Simulation (OSCAR) Geometry: • All geometry up-to-date • Currently moving to geometry in XML database, common to Simulation/Reconstruction/Visualisation • Detailed checking in progress CMS Overlap Detection Tool GEANT4 expects: (a) Daughters of the same mother must not intersect each other (b) Daughters of the same mother must be fully contained in their mother (c) some refinements of the above in case of replication and parameterisation If these conditions hold for every mother-volume and the first level of daughters therein, the geometry is OK! CMS GEANT4 Sim. & Detector Desc.Pedro Arce(CERN/CIEMAT)

  5. Shoot geantinos CMS GEANT4 Sim. & Detector Desc.Pedro Arce(CERN/CIEMAT)

  6. View of CMS muon system Sliced view of CMS barrel detectors CMS GEANT4 Sim. & Detector Desc.Pedro Arce(CERN/CIEMAT)

  7. OSCAR Primary generator: • CMS particle gun: • Scan in , , energy • Random in , , energy • Interface with HEPEVT ASCII files • Interface with PYTHIA ntuples Persistency: • Hits • Primary generator particles • Selected tracks • Using Objectivity, moving to ROOT CMS GEANT4 Sim. & Detector Desc.Pedro Arce(CERN/CIEMAT)

  8. OSCAR - IGUANA • Interactive visualisation is done with IGUANA (see poster in this Conference) • Visualise any GEANT4 Geometry • Select by logical volumes / by individual copies / by category • Show volume/object details/properties • Picking, slicing • GEANT4 command line • A wizard to guide through OSCAR settings • Integrated with overlap detection • Adding other extensions is trivial (e.g. GUIs like overlap detection) • Visualise Tracks • Visualise magnetic field • 2D plane that can be rotated • Field direction as an arrow • Field intensity as colour CMS GEANT4 Sim. & Detector Desc.Pedro Arce(CERN/CIEMAT)

  9. OSCAR - IGUANA Overlap detection Example extension (a trivial wizard) Queried from plug-in database, loaded on request and bound to IGUANA G4 Run Manager Control of arbitrary GEANT4 tree Correlated Picking IGUANA viewer displaying OpenInventor scene CMS GEANT4 Sim. & Detector Desc.Pedro Arce(CERN/CIEMAT)

  10. CMS magnetic field in IGUANA CMS GEANT4 Sim. & Detector Desc.Pedro Arce(CERN/CIEMAT)

  11. OSCAR Physics: • Electromagnetic processes needed at LHC • Hadronic processes needed at LHC CMS Physics Technical Design Report is planned to be written using OSCAR (due december 2004) OSCAR milestone June 2003: “Reproduce the physics results of the GEANT3 simulation with the same performance” CMS GEANT4 Sim. & Detector Desc.Pedro Arce(CERN/CIEMAT)

  12. GEANT4/GEANT3 simu. + ORCA reco. CMS central tracker Single  events CMS GEANT4 Sim. & Detector Desc.Pedro Arce(CERN/CIEMAT)

  13. GEANT4/GEANT3 simu. + ORCA reco. CMS muon system Single  events phi_sim - phi_rec eta_sim - eta_rec Pt_sim - Pt_rec CMS GEANT4 Sim. & Detector Desc.Pedro Arce(CERN/CIEMAT)

  14. GEANT4/GEANT3 ECAL comparisons CMS GEANT4 Sim. & Detector Desc.Pedro Arce(CERN/CIEMAT)

  15. OSCAR Time Performance Full events in full CMS > 10000 events without crashing - H, tte, Z - All CMS geometry - 3D TOSCA magnetic field - Production and tracking cuts as in CMSIM - geant4.4.0.ref02 - Pentium III 850 Mhz, 640 Mb CMS GEANT4 Sim. & Detector Desc.Pedro Arce(CERN/CIEMAT)

  16. H in all CMS (10 Events) - CMSIM (442828 tracks) No Tracks Initial track energy • OSCAR (427136 tracks) MeV - CMSIM (442828 tracks) No Tracks Track length • OSCAR (427136 tracks) MeV CMS GEANT4 Sim. & Detector Desc.Pedro Arce(CERN/CIEMAT) mm

  17. Time performance - H (10 events) CMSIM: 439k tracks 318 seconds OSCAR: 400k tracks 583 seconds (1.83) - tte (10 events) CMSIM: 1809k tracks 919 seconds OSCAR: 1159k tracks 2125 seconds (2.31) - Z (10 events) CMSIM: 1105k tracks 480 seconds OSCAR: 941k tracks 1240 seconds (2.58) No GEANT4 optimization done yet! CMS GEANT4 Sim. & Detector Desc.Pedro Arce(CERN/CIEMAT)

  18. CMS GEANT4 Sim. & Detector Desc.Pedro Arce(CERN/CIEMAT)

  19. CMS GEANT4 Sim. & Detector Desc.Pedro Arce(CERN/CIEMAT)

  20. CMS GEANT4 Sim. & Detector Desc.Pedro Arce(CERN/CIEMAT)

  21. CMS GEANT4 Sim. & Detector Desc.Pedro Arce(CERN/CIEMAT)

  22. CMS GEANT4 Sim. & Detector Desc.Pedro Arce(CERN/CIEMAT)

  23. CMS GEANT4 Sim. & Detector Desc.Pedro Arce(CERN/CIEMAT)

  24. CMS GEANT4 Sim. & Detector Desc.Pedro Arce(CERN/CIEMAT)

  25. CMS GEANT4 Sim. & Detector Desc.Pedro Arce(CERN/CIEMAT)

  26. CMS GEANT4 Sim. & Detector Desc.Pedro Arce(CERN/CIEMAT)

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