Comparison of carbon and HI-Z primary collimators for the LHC phase II collimation system

A current issue with the LHC collimation system is single-diffractive, off-energy protons from the primary collimators that pass completely through the secondary collimation system and are absorbed immediately downbeam in the cold magnets of the dispersion suppressor section. Simulations suggest tha...

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Detalles Bibliográficos
Autores principales: Keller, L, Markiewicz, T, Smith, J, Assmann, R, Bracco, C, Weiler, T
Formato: info:eu-repo/semantics/article
Lenguaje:eng
Publicado: 2010
Materias:
Accelerators and Storage Rings
8: Collimators & materials for higher beam power beam
Acceso en línea:http://cds.cern.ch/record/1307579
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author Keller, L
Markiewicz, T
Smith, J
Assmann, R
Bracco, C
Weiler, T
author_facet Keller, L
Markiewicz, T
Smith, J
Assmann, R
Bracco, C
Weiler, T
author_sort Keller, L
collection CERN
description A current issue with the LHC collimation system is single-diffractive, off-energy protons from the primary collimators that pass completely through the secondary collimation system and are absorbed immediately downbeam in the cold magnets of the dispersion suppressor section. Simulations suggest that the high impact rate could result in quenching of these magnets. We have studied replacing the 60 cm primary graphite collimators, which remove halo mainly by inelastic strong interactions, with 5.25 mm tungsten, which remove halo mainly by multiple coulomb scattering and thereby reduce the rate of single-diffractive interactions that cause losses in the dispersion suppressor.
format info:eu-repo/semantics/article
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spelling cern-13075792019-09-30T06:29:59Z http://cds.cern.ch/record/1307579 eng Keller, L Markiewicz, T Smith, J Assmann, R Bracco, C Weiler, T Comparison of carbon and HI-Z primary collimators for the LHC phase II collimation system Accelerators and Storage Rings 8: Collimators & materials for higher beam power beam A current issue with the LHC collimation system is single-diffractive, off-energy protons from the primary collimators that pass completely through the secondary collimation system and are absorbed immediately downbeam in the cold magnets of the dispersion suppressor section. Simulations suggest that the high impact rate could result in quenching of these magnets. We have studied replacing the 60 cm primary graphite collimators, which remove halo mainly by inelastic strong interactions, with 5.25 mm tungsten, which remove halo mainly by multiple coulomb scattering and thereby reduce the rate of single-diffractive interactions that cause losses in the dispersion suppressor. info:eu-repo/grantAgreement/EC/FP7/227579 info:eu-repo/semantics/openAccess Education Level info:eu-repo/semantics/article http://cds.cern.ch/record/1307579 2010
spellingShingle Accelerators and Storage Rings
8: Collimators & materials for higher beam power beam
Keller, L
Markiewicz, T
Smith, J
Assmann, R
Bracco, C
Weiler, T
Comparison of carbon and HI-Z primary collimators for the LHC phase II collimation system
title Comparison of carbon and HI-Z primary collimators for the LHC phase II collimation system
title_full Comparison of carbon and HI-Z primary collimators for the LHC phase II collimation system
title_fullStr Comparison of carbon and HI-Z primary collimators for the LHC phase II collimation system
title_full_unstemmed Comparison of carbon and HI-Z primary collimators for the LHC phase II collimation system
title_short Comparison of carbon and HI-Z primary collimators for the LHC phase II collimation system
title_sort comparison of carbon and hi-z primary collimators for the lhc phase ii collimation system
topic Accelerators and Storage Rings
8: Collimators & materials for higher beam power beam
url http://cds.cern.ch/record/1307579
http://cds.cern.ch/record/1307579
work_keys_str_mv AT kellerl comparisonofcarbonandhizprimarycollimatorsforthelhcphaseiicollimationsystem
AT markiewiczt comparisonofcarbonandhizprimarycollimatorsforthelhcphaseiicollimationsystem
AT smithj comparisonofcarbonandhizprimarycollimatorsforthelhcphaseiicollimationsystem
AT assmannr comparisonofcarbonandhizprimarycollimatorsforthelhcphaseiicollimationsystem
AT braccoc comparisonofcarbonandhizprimarycollimatorsforthelhcphaseiicollimationsystem
AT weilert comparisonofcarbonandhizprimarycollimatorsforthelhcphaseiicollimationsystem

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