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

2. Adele Rimoldi, Pavia University & INFN – CERN G4usersWorkshop Nov 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

3. 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

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

5. Adele Rimoldi, Pavia University & INFN – CERN G4usersWorkshop Nov 2002 5 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 Simulated dp/p (%) for an initial 20 GeV beam dp/p Beam profile Eta profile /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

6. 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

7. 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

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

9. Adele Rimoldi, Pavia University & INFN – CERN G4usersWorkshop Nov 2002 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