Trapped Mode Study For A Rotatable Collimator Design For The LHC Upgrade

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A rotatable collimator is proposed for the LHC phase II collimation upgrade. When the beam crosses the collimator, it will excite trapped modes that can contribute to the beam energy loss and power dissipation on the vacuum chamber wall. Transverse trapped modes can also generate transverse kicks on the beam and may thus affect the beam quality. In this paper, the parallel eigensolver code Omega3P is used to search for all the trapped modes below 2 GHz in two collimator designs, one with rectangular and the other with circular vacuum chamber. It is found that the longitudinal trapped modes in ... continued below

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3 pages

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Xiao, Liling; Ng, Cho-Kuen; Smith, Jeffery Claiborne & Caspers, Fritz June 23, 2009.

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A rotatable collimator is proposed for the LHC phase II collimation upgrade. When the beam crosses the collimator, it will excite trapped modes that can contribute to the beam energy loss and power dissipation on the vacuum chamber wall. Transverse trapped modes can also generate transverse kicks on the beam and may thus affect the beam quality. In this paper, the parallel eigensolver code Omega3P is used to search for all the trapped modes below 2 GHz in two collimator designs, one with rectangular and the other with circular vacuum chamber. It is found that the longitudinal trapped modes in the circular vacuum chamber design may cause excessive heating. Adding ferrite tiles on the circular vacuum chamber wall can strongly damp these trapped modes. We will present and discuss the simulation results.

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3 pages

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  • Contributed to Particle Accelerator Conference (PAC 09), Vancouver, BC, Canada, 4-8 May 2009

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  • Report No.: SLAC-PUB-13649
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 958059
  • Archival Resource Key: ark:/67531/metadc934620

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  • June 23, 2009

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  • Nov. 13, 2016, 7:26 p.m.

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  • Aug. 1, 2017, 11:31 a.m.

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Xiao, Liling; Ng, Cho-Kuen; Smith, Jeffery Claiborne & Caspers, Fritz. Trapped Mode Study For A Rotatable Collimator Design For The LHC Upgrade, article, June 23, 2009; United States. (digital.library.unt.edu/ark:/67531/metadc934620/: accessed January 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.