High-Current Effects in The PEP-II Storage Rings

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High beam currents in PEP-II have been a challenge for vacuum system and ring components. For the {approx} 1 cm long bunches peak currents exceed 100 A and modest impedance can give rise to voltage spikes and discharges. During the last two runs, difficulties arose from rf seals at the 'flex flanges' in the HER. High temperatures were seen and the seals turned out to be severely damaged by discharges. In the LER, the horizontal stripline kickers of the bunch-by-bunch feedback system experiences breakdown at high bunch current-Macor pins installed for mechanical stability turned out to be a weak spot ... continued below

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3 pages

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Wienands, U.; Sullivan, M.K.; Akre, R.; Cheng, W.; Colocho, W.; DeBarger, S. et al. June 19, 2009.

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High beam currents in PEP-II have been a challenge for vacuum system and ring components. For the {approx} 1 cm long bunches peak currents exceed 100 A and modest impedance can give rise to voltage spikes and discharges. During the last two runs, difficulties arose from rf seals at the 'flex flanges' in the HER. High temperatures were seen and the seals turned out to be severely damaged by discharges. In the LER, the horizontal stripline kickers of the bunch-by-bunch feedback system experiences breakdown at high bunch current-Macor pins installed for mechanical stability turned out to be a weak spot causing discharges. Finally, in the HER an experiment to shorten the ion-clearing gap in the beam revealed signs of ion-induced instability indicating that the HER has been operating quite close to the stability limit. The effects shown here are relevant to future high-intensity electron and positron rings like SuperB and PEP-X.

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3 pages

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  • Journal Name: Conf.Proc.C0806233:WEPP041,2008; Conference: EPAC'08, 11th European Particle Accelerator Conference, 23-27 June 2008, Genoa, Italy

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  • Report No.: SLAC-PUB-13677
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 957417
  • Archival Resource Key: ark:/67531/metadc935268

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  • June 19, 2009

Added to The UNT Digital Library

  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 15, 2016, 3:28 p.m.

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Wienands, U.; Sullivan, M.K.; Akre, R.; Cheng, W.; Colocho, W.; DeBarger, S. et al. High-Current Effects in The PEP-II Storage Rings, article, June 19, 2009; United States. (digital.library.unt.edu/ark:/67531/metadc935268/: accessed December 11, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.