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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 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 • Track length per unit volume and time: cm/cm3/s = cm–2s-1 • Fluence • Time Integrated Flux: cm–2
Rack Loc3 Rack Loc4 Rack Loc1 Rack Loc2
Gas Pressure Estimates 1015 molec./m3 after some weeks of running
Origin of Muon Halo • LHC Project Note 273 LHC Project Note 273 Origin of muon halo
old (static) estimate
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
Conclusions • Simulation work finished • Some re-weighting of contributions needed: • pp/ArAr/PbPb/pPb • halo/beam-gas