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Geant4 simulations for the calorimeter prototypes

Geant4 simulations for the calorimeter prototypes. D. Di Julio, J. Cederkäll, P. Golubev, B. Jakobsson Lund University, Lund, Sweden. Outline. Simulation overview Geometry Physics list Benchmark simulations Response to gammas and protons Light collection Future work. Geometry.

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Geant4 simulations for the calorimeter prototypes

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  1. Geant4 simulations for the calorimeter prototypes D. Di Julio, J. Cederkäll, P. Golubev, B. Jakobsson Lund University, Lund, Sweden

  2. Outline • Simulation overview • Geometry • Physics list • Benchmark simulations • Response to gammas and protons • Light collection • Future work

  3. Geometry • Material: CsI • Separation distance: 0.4 mm, vacuum • 15 crystals 10x10 15x42 130 mm 10x30

  4. Physics list • For gamma: • Low energy package – Photoelectric and conversion, Rayleigh, Compton Scattering • For e- and e+ : • Low energy package for e- • Multiple scattering, ionization, Bremsstrahlung, and annihilation (for e+) • For protons • QGSP physics list

  5. Preliminary simulations • Compare with previous calculations • Performed by Thomas Zerguerras • 20 MeV gamma Large single block: 110x110x200mm3 • 5x5 array of crystals, 22x22x200mm3 • 0.1 mm between crystals, space filled with kapton

  6. 500 keV gamma • Large fraction of full energy events in center crystal • ~60% of events lie in full energy peak in center crystal • Some energy deposition in surrounding crystals

  7. 500 keV gamma On average, 1 crystal out of 15 is fired per incident gamma, 6 max width at half max ~ 1 crystal Sum spectrum for entire block, ~91% of the events lie in the full energy peak

  8. 15 MeV gamma • Energy deposited in more crystals • Number of full energy events decreases • No significant full energy peak in center crystal

  9. 15 MeV gamma ~3 crystals out of 15 fire per incident Gamma,11 at most, width increases ~3 crystals Sum spectrum for entire block, full energy peak appears, ~13% of the events lie in the full energy peak

  10. 28 MeV gamma • Large spread of energy deposition • Very few fully contained events, no full energy peak in center crystal

  11. 28 MeV gamma 4.5 crystals out of 15 fire on average, 12 at most, width ~4 crystals Full energy peak can be seen, only about ~2.5% of events lie in full energy peak

  12. 50 MeV protons • Energy deposited mostly in center crystal, little to no energy spread

  13. 180 MeV protons • Large full energy peak in central crystal • Some energy deposition in nearby crystals

  14. 180 MeV protons 1.5 crystals out of 15 fire on average, 11 at most, width ~1 crystals Sum spectrum for entire block, full energy peak appears, ~80% of the events lie in the full energy peak

  15. Light Collection • Preliminary simulations to investigate light collection • Input: • Photon emission spectrum, light yield, fast and slow time components • Need absorption length for tracking • G4LogicalBorderSurface with reflection properties of VM2000 was used for the simulations D. Motta et al. NIM A 547 (2005) 368. J.D. Valentine et al. NIM A 325 (1993) 147.

  16. Future Work • Addition of reflector between crystals • 2nd prototype geometry • Light collection in single crystals • Threshold effects

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