Decreasing the LHC impedance with a nonlinear collimation system

A two-stage nonlinear collimation system based on a pair of skew sextupoles is presented for the LHC.We show the details of the optics design and study the halo cleaning efficiency of such a system. This nonlinear collimation system would allow opening up collimator gaps, and thereby reduce the coll...

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Detalles Bibliográficos
Autores principales: Resta-López, J, Faus-Golfe, A, Zimmermann, F
Lenguaje:eng
Publicado: CERN 2007
Materias:
Accelerators and Storage Rings
Acceso en línea:https://dx.doi.org/10.5170/CERN-2007-002.199
http://cds.cern.ch/record/1045226
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author Resta-López, J
Faus-Golfe, A
Zimmermann, F
author_facet Resta-López, J
Faus-Golfe, A
Zimmermann, F
author_sort Resta-López, J
collection CERN
description A two-stage nonlinear collimation system based on a pair of skew sextupoles is presented for the LHC.We show the details of the optics design and study the halo cleaning efficiency of such a system. This nonlinear collimation system would allow opening up collimator gaps, and thereby reduce the collimator impedance, which presently limits the LHC beam intensity. Assuming the nominal LHC beam at 7 TeV, the transverse coherent tune shifts of rigid-dipole coupled-bunch modes are computed for both the baseline linear collimation system and the proposed nonlinear one. In either case, the tune shifts of the most unstable modes are compared with the stability diagrams for Landau damping.
id cern-1045226
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2007
publisher CERN
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spelling cern-10452262019-09-30T06:29:59Zdoi:10.5170/CERN-2007-002.199http://cds.cern.ch/record/1045226engResta-López, JFaus-Golfe, AZimmermann, FDecreasing the LHC impedance with a nonlinear collimation systemAccelerators and Storage RingsA two-stage nonlinear collimation system based on a pair of skew sextupoles is presented for the LHC.We show the details of the optics design and study the halo cleaning efficiency of such a system. This nonlinear collimation system would allow opening up collimator gaps, and thereby reduce the collimator impedance, which presently limits the LHC beam intensity. Assuming the nominal LHC beam at 7 TeV, the transverse coherent tune shifts of rigid-dipole coupled-bunch modes are computed for both the baseline linear collimation system and the proposed nonlinear one. In either case, the tune shifts of the most unstable modes are compared with the stability diagrams for Landau damping.CERNoai:cds.cern.ch:10452262007
spellingShingle Accelerators and Storage Rings
Resta-López, J
Faus-Golfe, A
Zimmermann, F
Decreasing the LHC impedance with a nonlinear collimation system
title Decreasing the LHC impedance with a nonlinear collimation system
title_full Decreasing the LHC impedance with a nonlinear collimation system
title_fullStr Decreasing the LHC impedance with a nonlinear collimation system
title_full_unstemmed Decreasing the LHC impedance with a nonlinear collimation system
title_short Decreasing the LHC impedance with a nonlinear collimation system
title_sort decreasing the lhc impedance with a nonlinear collimation system
topic Accelerators and Storage Rings
url https://dx.doi.org/10.5170/CERN-2007-002.199
http://cds.cern.ch/record/1045226
work_keys_str_mv AT restalopezj decreasingthelhcimpedancewithanonlinearcollimationsystem
AT fausgolfea decreasingthelhcimpedancewithanonlinearcollimationsystem
AT zimmermannf decreasingthelhcimpedancewithanonlinearcollimationsystem

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