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H8 Muon Testbeam Simulation

Detailed simulation of 20 GeV muons in H8 testbeam, comparing Geant4 data, handling electronic noise, evaluating extra hits, and planning future validations.

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H8 Muon Testbeam Simulation

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  1. H8 Muon Testbeam Simulation and the Physics Validation in Geant4 Adele Rimoldi, Pavia University & INFN – CERN G4usersWorkshop Nov 2002 CERN - 14 November, 2002

  2. The simulation is also a support • For testing/tuning other programs • There are some additional activities connected with the Geant4 Simulation for the Muons in H8 • T.Baroncelli, F.Petrucci (Rome III) CALIB reconstruction, autocalibration, physics events • F.Cerutti (CERN), A.Policicchio (Cosenza) effects of secondaries on the pattern recognition algorithms in the reconstruction with CALIB & MUONBOX Adele Rimoldi, Pavia University & INFN – CERN G4usersWorkshop Nov 2002

  3. H8 Testbeam Simulation • Geant4/data comparisons in the H8 testbeam • Geometry • With or without material (Fe o Al) in front to the muon chambersextra hits presence from interaction between tracks and material can interfere with the reconstruction • Beam Description • Noise and (preliminary) simulation of electronic response  Detailed simulation Adele Rimoldi, Pavia University & INFN – CERN G4usersWorkshop Nov 2002

  4. amdb_simrec.H8.2002 Fe or Al in front of BIL chamber 15º 37 cm from first BIL multilayer 4950 cm 20 cm H8 Geometry Adele Rimoldi, Pavia University & INFN – CERN G4usersWorkshop Nov 2002

  5. Simulated dp/p (%) for an initial 20 GeV beam Eta profile Beam profile dp/p /Generator/SingleParticle/EtaRange 0.258 0.0049 /Generator/SingleParticle/PhiRange 90. 90. /Generator/SingleParticle/P_Range 20 20 /Generator/SingleParticle/MeanVertex 0 -230 0 /Generator/SingleParticle/SigmaVertex 29 0 29 H8 testbeam • detailed simulation • 20 GeV muons with the H8 dp/p • Use of electromagnetic processes, well simulated by Geant4 • cut-off on energy deposited, 700eV • H8 threshold equivalent (60mV and 25 e- of primary ionization) • Track vertices gaussian distributed with respect to the nominal position • Beam opening angle gaussian distributed with sigma +0.06rad Adele Rimoldi, Pavia University & INFN – CERN G4usersWorkshop Nov 2002

  6. Extra hits • electronic noise simulation responsible of 50% of extra hits per event (uncorrelated noise) • random hits generated in the MDT chambers and added to the tack hits • correlated noise (Physics) simulation • additional effect first electronic response evaluation • if two hits are recorded in the same MDT tube only the one with lower drift time is retained Adele Rimoldi, Pavia University & INFN – CERN G4usersWorkshop Nov 2002

  7. H8 testbeam Simulation • data/G4 comparisons • Events extra hits content • number of extra hits per event measurement (for each layer (multilayer) of each chamber) • extra hits distribution next to the true track • Data • 10Kevt from August testbeam H8 • daq-1_tbmuon_0010907.run Al, no magnetic field • daq-1_tbmuon_0010913.run Fe, no magnetic field • daq-1_tbmuon_0010917.run no field, no material • Geant4 • 10* *6evt no magnetic field with complete physics list (AtlasPhysicsList) no material or with Fe o Al • 180 Gev • 20 Gev Adele Rimoldi, Pavia University & INFN – CERN G4usersWorkshop Nov 2002

  8. Fraction of events with extra hits 2002 Adele Rimoldi, Pavia University & INFN – CERN G4usersWorkshop Nov 2002 preliminary

  9. Plans • Review all the results by the next H8 Workshop • CERN: 5-6 December • Plan the studies to be done in Geant4 with the combined setup • Already taken data in the last summer testbeam with muon chambers, tilecal and pixels • Plan future studies for G4 validation • It is time to ask for special setups with materials Adele Rimoldi, Pavia University & INFN – CERN G4usersWorkshop Nov 2002

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