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Levinsen, Y.I.

Paper Title Page
TUPEB072 Beam-gas Loss Rates in the LHC 1686
 
  • Y.I. Levinsen, R. Appleby, H. Burkhardt
    CERN, Geneva
 
 

We report on first observations and detailed simulations of beam gas rates in the LHC. For the simulations, a comprehensive tool has been set up to simulate in a few hours the expected beam gas losses when pressure maps, collimator settings, and/or beam optics changes. The simulation includes both elastic and inelastic scattering, with subsequent multiturn tracking of proton residues. This provides amongst others a more realistic collimator loss distributions from elastic interactions than what was previously available.

 
TUPEB073 Dependence of Background Rates on Beam Separation in the LHC 1689
 
  • Y.I. Levinsen, R. Appleby, H. Burkhardt, S.M. White
    CERN, Geneva
 
 

Background and loss rates vary when beams are brought into collisions in the LHC and when the beam separation is varied during luminosity scans. We report on the first observations in the early LHC operation. The observed effects are analyzed and compared with models and simulation.