Longitudinal Wakefield Study in SLAC Rotatable Collimator Design for the LHC Phase II Upgrade

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SLAC proposed a rotatable collimator design for the LHC Phase II collimation upgrade. There are 20 facet faces on each cylindrical jaw surface and two jaws are rotatable in order to introduce a clean surface in case of a beam hitting a jaw during operation. When the beam crosses the collimator, it will excite broad-band and narrow-band modes. The longitudinal modes can contribute to beam energy loss and power dissipation on the vacuum chamber wall. In this paper, the parallel finite element eigensolver Omega3P is used to search for all the longitudinal trapped modes in the SLAC collimator design. The ... continued below

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Xiao, Liling; /SLAC; Lundgren, Steven; /SLAC; Markiewicz, Thomas; /SLAC et al. August 25, 2010.

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SLAC proposed a rotatable collimator design for the LHC Phase II collimation upgrade. There are 20 facet faces on each cylindrical jaw surface and two jaws are rotatable in order to introduce a clean surface in case of a beam hitting a jaw during operation. When the beam crosses the collimator, it will excite broad-band and narrow-band modes. The longitudinal modes can contribute to beam energy loss and power dissipation on the vacuum chamber wall. In this paper, the parallel finite element eigensolver Omega3P is used to search for all the longitudinal trapped modes in the SLAC collimator design. The power dissipation generated by the beam in collimators with different vacuum chamber and RF contact designs is discussed. It is found that a wider RF foil connecting the jaw and the vacuum flange can reduce efficiently the beam heating caused by the longitudinal modes.

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  • Journal Name: Conf.Proc.C100523:TUPEC079,2010; Conference: 1st International Particle Accelerator Conference: IPAC'10, 23-28 May 2010, Kyoto, Japan

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  • Report No.: SLAC-PUB-14164
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 992959
  • Archival Resource Key: ark:/67531/metadc1015489

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  • August 25, 2010

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  • Oct. 14, 2017, 8:36 a.m.

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  • Nov. 3, 2017, 1:27 p.m.

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Xiao, Liling; /SLAC; Lundgren, Steven; /SLAC; Markiewicz, Thomas; /SLAC et al. Longitudinal Wakefield Study in SLAC Rotatable Collimator Design for the LHC Phase II Upgrade, article, August 25, 2010; [California]. (digital.library.unt.edu/ark:/67531/metadc1015489/: accessed June 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.