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Chromatic LHC Optics Effects on Collimation Phase Space Cuts

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
Lenguaje:eng
Publicado: 2009
Materias:
Acceso en línea:http://cds.cern.ch/record/1207341
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author Bracco, C
Assmann, R
author_facet Bracco, C
Assmann, R
author_sort Bracco, C
collection CERN
description 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 the choice of an optimized LHC optics are discussed.
id cern-1207341
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2009
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spelling cern-12073412019-09-30T06:29:59Zhttp://cds.cern.ch/record/1207341engBracco, CAssmann, RChromatic LHC Optics Effects on Collimation Phase Space CutsAccelerators and Storage RingsThe 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 the choice of an optimized LHC optics are discussed.CERN-ATS-2009-033oai:cds.cern.ch:12073412009-09-17
spellingShingle Accelerators and Storage Rings
Bracco, C
Assmann, R
Chromatic LHC Optics Effects on Collimation Phase Space Cuts
title Chromatic LHC Optics Effects on Collimation Phase Space Cuts
title_full Chromatic LHC Optics Effects on Collimation Phase Space Cuts
title_fullStr Chromatic LHC Optics Effects on Collimation Phase Space Cuts
title_full_unstemmed Chromatic LHC Optics Effects on Collimation Phase Space Cuts
title_short Chromatic LHC Optics Effects on Collimation Phase Space Cuts
title_sort chromatic lhc optics effects on collimation phase space cuts
topic Accelerators and Storage Rings
url http://cds.cern.ch/record/1207341
work_keys_str_mv AT braccoc chromaticlhcopticseffectsoncollimationphasespacecuts
AT assmannr chromaticlhcopticseffectsoncollimationphasespacecuts