Beam-Gas Inelastic scattering in CEPC partial double ring

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Presentation transcript:

Beam-Gas Inelastic scattering in CEPC partial double ring Sha Bai CEPC AP meeting 2016-04-22

CEPC beam loss effect on beam lifetime

Beam-Gas Inelastic scattering We have to deal with two effects: Bremsstrahlung scattering, where the particle emits a photon (and the nucleus is left unexcited). Inelastic scattering from an electron of the atom in which the momentum transfer excites the atom. Bremsstrahlung scattering at the nucleus: The total differential cross section is given by the sum of both contributions: Inelastic scattering off the electrons of the residual gas atom:

Beam-Gas Inelastic scattering generated events Generator model: particles energy change but direction no change. Generate 100000 particles ~ energy spread

Lost particles statistic Events generated in each ~1m region , tracking for one turn in SAD Lost particles statistic in ~200m Paticles lost little near IP region Most particles lost in upstream Put in detector to do next analysis

Conclusions and Prospects Beam-Gas Inelastic scattering events are generated and lost particles information got after tracking in SAD. With 1.7cm radius beam pipe aperture in final doublet, the lost particles after tracking in one turn upstream of IP1 are quite little near IP region. Put lost particles in the detector and do simulation.