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Simulation of energy depositions in PSD for 7 Be+ 9 Be reaction

Simulation of energy depositions in PSD for 7 Be+ 9 Be reaction. Problem with SHIELD code. Identification of spectators. Use of Dpmjet model. Energy depositions in PSD from spectators and nonspectators. Discussion on PSD trigger. 1. 158 GeV/c SHIELD model. Energy deposition in PSD for:.

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Simulation of energy depositions in PSD for 7 Be+ 9 Be reaction

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  1. Simulation of energy depositions in PSD for 7Be+9Be reaction • Problem with SHIELD code. • Identification of spectators. • Use of Dpmjet model. • Energy depositions in PSD from spectators and nonspectators. • Discussion on PSD trigger. 1

  2. 158 GeV/c SHIELD model. Energy deposition in PSD for: Serious problem!! Non-spectators spectators Edep in all modules Edep in small modules Spectators+ nonspectators Most of spectators deposit energy in small modules 2

  3. How the spectators are selected 3

  4. Be7 + Be9 @ 158 AGeV Shield UrQMD All Spectators Spectators protons neutrons fragments 4

  5. Be7 + Be9 @ 158 AGeV Shield Dpmjet All Spectators Spectators protons neutrons fragments 5

  6. Strong difference in the deposited energy for the spectators generated with different codes (Shield, Dpmjet, UrQMD) 6

  7. Edep on the PSD surface, w/o magnetic field Be7 + Be9 @ 158 AGeV Be9 + Be9 @ 158 AGeV Shield ?? Dpmjet UrQMD Li7 + Be9 @ 158 AGeV Shield 7

  8. Be7 + Be9 @ 40 AGeV Dpmjet generator (0.3 cm Be9 target) Geant4 – transport code Magnetic field is applied Vacuum between target and PSD PSD is located at 23 m from the target 8

  9. 40 AGeV spectators 9

  10. 40 AGeV nonspectators 10

  11. 40 AGeV Edep in all modules Edep in small modules Energy in PSD Energy on PSD surface spectators nonpectators all 11

  12. Be7 + Be9 @ 80 AGeV Dpmjet generator (0.3 cm Be9 target) Geant4 – transport code Magnetic field is applied Vacuum between target and PSD PSD is located at 23 m from the target 12

  13. 80 AGeV spectators 13

  14. 80 AGeV nonspectators 14

  15. 80 AGeV Edep in all modules Edep in small modules Energy in PSD Energy on PSD surface spectators nonpectators all 15

  16. Be7 + Be9 @ 158 AGeV Dpmjet generator (0.3 cm Be9 target) Geant4 – transport code Magnetic field is applied Vacuum between target and PSD PSD is located at 23 m from the target 16

  17. 158 AGeV spectators 17

  18. 158 AGeV nonspectators 18

  19. 158 AGeV Edep in all modules Edep in small modules Energy in PSD Energy on PSD surface spectators nonpectators all 19

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