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LSO ECAL Geant4 Simulation

An introduction to Geant4 simulation, developed to prepare for LSO crystal testbeam. Preliminary results comparing G4 Full and G4 Flash simulations are provided, along with a discussion on deposited energy and processing time.

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LSO ECAL Geant4 Simulation

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  1. LSO ECAL Geant4 Simulation C. Cecchi - S. Germani - P. Lubrano INFN Perugia

  2. Geant4 Simulation: Intro • Geant4 Full simulation • Developed to prepare LSO crystals testbeam • Geometry: • Up to now the geometry is a NxN projective xtals/modules Matrix • No real BaBar ECAL geometry • No realistic SuperB Fwd ECAL geometry • Geant4 Flash Simulation • All very very preliminary! • Run just once • Need to understad many things • Geometry • Same as G4 Full LSO G4 Simulation

  3. Geometry • Projective Xtals: • 2.5x2.5 cm Front • 2.88x2.88 cm Back • 20 cm Depth (~17 X0) • Dead Material • BaBar style • CMS style • Matrix: • 3x3 Xtals module • 7x7 module matrix • Beam • 50 MeV to 9 GeV • , e- LSO G4 Simulation

  4. Deposited Energy Fit Tested Asymmetrical Gauss function to fit the distribution of the Fraction of Deposited Energy (Edep/Ebeam): • P1 : most probable value (mpv) • P2+xP3 : running sigma 0.5 GeV 2.0 GeV 9.0 GeV LSO G4 Simulation

  5. Edep changing configurations Edep mpv Edep mean Edep sigma Edep rms LSO G4 Simulation

  6. Processing Time LSO G4 Simulation

  7. Edep G4 Full vs G4 Flash Beam 200 MeV Beam 2 GeV Beam 2 GeV Beam 200 MeV LSO G4 Simulation

  8. Edep G4 Full vs G4 Flash Beam 5 GeV Ore the results are from a test performed just to see what happens The deposited energy has a very strange behaviour wh have to understand Beam 5 GeV LSO G4 Simulation

  9. Edep mean LSO G4 Simulation

  10. Conclusions • The geometry used has been developed with the beam test i mind and has been used just to comapre results • All the results are more than preliminary: just a test • G4Flash seems to be quite fast • Do not know the effect of higher gemetrical complexity on performance LSO G4 Simulation

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