Suppression of Beam-Ion Instability in Electron Rings with Multi-Bunch Train Beam Fillings

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The ion-caused beam instability in the future light sources and electron damping rings can be serious due to the high beam current and ultra-small emittance of picometer level. One simple and effective mitigation of the instability is a multi-bunch train beam filling pattern which can significantly reduce the ion density near the beam, and therefore reduce the instability growth rate up to two orders of magnitude. The suppression is more effective for high intensity beams with low emittance. The distribution and the field of trapped ions are benchmarked to validate the model used in the paper. The wake field of ... continued below

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20 pages

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Wang, L.; Cai, Y.; Raubenheimer, T.O.; /SLAC; Fukuma, H. & /KEK, Tsukuba August 18, 2011.

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The ion-caused beam instability in the future light sources and electron damping rings can be serious due to the high beam current and ultra-small emittance of picometer level. One simple and effective mitigation of the instability is a multi-bunch train beam filling pattern which can significantly reduce the ion density near the beam, and therefore reduce the instability growth rate up to two orders of magnitude. The suppression is more effective for high intensity beams with low emittance. The distribution and the field of trapped ions are benchmarked to validate the model used in the paper. The wake field of ion-cloud and the beam-ion instability is investigated both analytically and numerically. We derived a simple formula for the build-up of ion-cloud and instability growth rate with the multi-bunch-train filling pattern. The ion instabilities in ILC damping ring, SuperKEKB and SPEAR3 are used to compare with our analyses. The analyses in this paper agree well with simulations.

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20 pages

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  • Journal Name: Phys.Rev.ST Accel.Beams 14:084401,2011; Journal Volume: 14; Journal Issue: 8

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  • Report No.: SLAC-PUB-14387
  • Grant Number: AC02-76SF00515
  • DOI: 10.1103/PhysRevSTAB.14.084401 | External Link
  • Office of Scientific & Technical Information Report Number: 1022509
  • Archival Resource Key: ark:/67531/metadc840877

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  • August 18, 2011

Added to The UNT Digital Library

  • May 19, 2016, 3:16 p.m.

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  • Dec. 2, 2016, 1:27 p.m.

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Wang, L.; Cai, Y.; Raubenheimer, T.O.; /SLAC; Fukuma, H. & /KEK, Tsukuba. Suppression of Beam-Ion Instability in Electron Rings with Multi-Bunch Train Beam Fillings, article, August 18, 2011; United States. (digital.library.unt.edu/ark:/67531/metadc840877/: accessed September 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.