Comparison of Carbon and Hi-Z Primary Collimators for the LHC Phase II Collimation System

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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.

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3 pages

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Keller, Lewis; /SLAC; Markiewicz, Thomas; /SLAC; Smith, Jeffrey; /SLAC et al. October 31, 2011.

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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.

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3 pages

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  • 1st International Particle Accelerator Conference: IPAC'10, 23-28 May 2010, Kyoto, Japan

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  • Report No.: SLAC-PUB-14178
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 1028683
  • Archival Resource Key: ark:/67531/metadc836377

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  • October 31, 2011

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  • May 19, 2016, 3:16 p.m.

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  • Nov. 22, 2016, 11:06 p.m.

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Keller, Lewis; /SLAC; Markiewicz, Thomas; /SLAC; Smith, Jeffrey; /SLAC et al. Comparison of Carbon and Hi-Z Primary Collimators for the LHC Phase II Collimation System, article, October 31, 2011; United States. (digital.library.unt.edu/ark:/67531/metadc836377/: accessed December 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.