CHROMATIC LHC OPTICS EFFECTS ON COLLIMATION PHASE SPACE CUTS

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The different levels of LHC collimators must be set up by respecting a strict setting hierarchy in order to guarantee the required performance and protection during the different operational machine stages. Two different subsystems establish betatron and momentum collimation for the LHC. Collimator...

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Detalles Bibliográficos
Autores principales: Bracco, C, Assmann, R W
Formato: info:eu-repo/semantics/article
Lenguaje:eng
Publicado: 2009
Materias:
Accelerators and Storage Rings
8: Collimators & materials for higher beam power beam
Acceso en línea:http://cds.cern.ch/record/1307568
Descripción
Sumario:The different levels of LHC collimators must be set up by respecting a strict setting hierarchy in order to guarantee the required performance and protection during the different operational machine stages. Two different subsystems establish betatron and momentum collimation for the LHC. Collimator betatronic phase space cuts are defined for a central on-momentum particle. However, due to the chromatic features of the LHC optics and energy deviations of particles, the different phase space cuts become coupled. Starting from the basic equation of the transverse beam dynamics, the influence of off-momentum beta-beat and dispersion on the effective collimator settings has been calculated. The results are presented, defining the allowed phase space regions from LHC collimation. The impacts on collimation-related setting tolerances and

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