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Update on ALICE Radiation Environment

Update on ALICE Radiation Environment. Blahoslav Pastircak Andreas Morsch. Radiation Sources. Particle production at the IP Beam losses at injection Beam-gas Interaction. Radiation Units. Absorbed Dose 1Gy = 1J/kg = 100 rad Flux

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Update on ALICE Radiation Environment

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  1. Update on ALICE Radiation Environment Blahoslav Pastircak Andreas Morsch

  2. Radiation Sources • Particle production at the IP • Beam losses at injection • Beam-gas Interaction

  3. Radiation Units • Absorbed Dose • 1Gy = 1J/kg = 100 rad • Flux • Track length per unit volume and time: cm/cm3/s = cm–2s-1 • Fluence • Time Integrated Flux: cm–2

  4. Rack Loc3 Rack Loc4 Rack Loc1 Rack Loc2

  5. Running Scenario (TP)

  6. Gas Pressure Estimates 1015 molec./m3 after some weeks of running

  7. Origin of Muon Halo • LHC Project Note 273 LHC Project Note 273 Origin of muon halo

  8. old (static) estimate

  9. Contributions from Radiation Sources • Current estimate • 10 % contribution from beam-gas • However, optimistic for beam-gas interaction in central ALICE and pessimistic for beam halo • In any case we don’t expect a higher contribution from beam-gas than from pp alone • 1% contribution from misinjected beam

  10. Dose Map ALICE Central

  11. Dose Map ALICE Backward

  12. Neutron Fluence ALICE Central

  13. Neutron Fluence ALICE Backwd

  14. Charged Fluence ALICE Central

  15. Charged Fluence ALICE Backwd

  16. Dose Map

  17. Neutron Fluence

  18. Results

  19. Conclusions • Simulation work finished • Some re-weighting of contributions needed: • pp/ArAr/PbPb/pPb • halo/beam-gas

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