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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...
Autores principales: | , |
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Lenguaje: | eng |
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2009
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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 |
record_format | invenio |
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 |