A Proposal for a New HOM Absorber in a Straight Section of the PEP-II Low Energy Ring

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Attainment of high luminosity in storage ring colliders necessitates increasing stored currents and reducing bunch lengths. Consequently, intense beam fields will scatter more power into higher order modes from beam line sources such as collimators, masks and tapers. This power penetrates into sensitive components such as a bellows, causing undesirable heating and limits machine performance. To overcome this limitation we propose incorporating ceramic absorbers in the vicinity of the bellows to damp beam induced modes while preserving a matched impedance to the beam. This is accomplished with an absorber configuration which damps TE dipole and quadrupole traveling waves while preserving ... continued below

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4 pages

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Weathersby, S.; Kosovsky, M.; Kurita, N.; Novokhatski, A.; Seeman, J.af SLAC & /SLAC, SSRL June 30, 2005.

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Attainment of high luminosity in storage ring colliders necessitates increasing stored currents and reducing bunch lengths. Consequently, intense beam fields will scatter more power into higher order modes from beam line sources such as collimators, masks and tapers. This power penetrates into sensitive components such as a bellows, causing undesirable heating and limits machine performance. To overcome this limitation we propose incorporating ceramic absorbers in the vicinity of the bellows to damp beam induced modes while preserving a matched impedance to the beam. This is accomplished with an absorber configuration which damps TE dipole and quadrupole traveling waves while preserving TM monopole propagation. A scattering parameter analysis is presented utilizing properties of commercial grade ceramics and indicates a feasible solution.

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4 pages

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  • Report No.: SLAC-PUB-11268
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 881137
  • Archival Resource Key: ark:/67531/metadc876409

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  • June 30, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 6, 2016, 4:54 p.m.

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Weathersby, S.; Kosovsky, M.; Kurita, N.; Novokhatski, A.; Seeman, J.af SLAC & /SLAC, SSRL. A Proposal for a New HOM Absorber in a Straight Section of the PEP-II Low Energy Ring, article, June 30, 2005; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc876409/: accessed August 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.