Transverse feedback systems for the PEP-II B-factory

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Growth rates of coherent beam oscillations are faster than the natural damping mechanisms for the parameters of the PEP-II B-factory storage rings at nominal currents, even with damping of cavity higher order modes (HOM`s). With 165 8 bunches separated by 4.2 ns, and a large current of up to 3A (2.14 A nominal in the low energy ring), many coupled-bunch modes are excited by the resistive wall impedance and cavity higher order mode impedance. Fastest growth times of transverse rigid-bunch modes of approximately 300 ps are expected, two orders of magnitude faster than the radiation damping time. We will provide ... continued below

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6 p.

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Corlett, J.N.; Barry, W.; Byrd, J.M.; Lambertson, G.; Johnson, J. & Fahmie, M. October 1, 1995.

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Description

Growth rates of coherent beam oscillations are faster than the natural damping mechanisms for the parameters of the PEP-II B-factory storage rings at nominal currents, even with damping of cavity higher order modes (HOM`s). With 165 8 bunches separated by 4.2 ns, and a large current of up to 3A (2.14 A nominal in the low energy ring), many coupled-bunch modes are excited by the resistive wall impedance and cavity higher order mode impedance. Fastest growth times of transverse rigid-bunch modes of approximately 300 ps are expected, two orders of magnitude faster than the radiation damping time. We will provide broadband, bunch-by-bunch feedback to suppress this coherent motion of the beam. Experience gained with a prototype system, installed and successfully operating at the LBNL Advanced Light Source (ALS), has been used extensively in developing the design of the PEP-II systems.

Physical Description

6 p.

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INIS; OSTI as DE96004323

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  • CEIBA95: international workshop on collective effects and impedance for B-factories, Tsukuba (Japan), 12-17 Jun 1995

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  • Other: DE96004323
  • Report No.: LBL--37781
  • Report No.: CBP-Note--156;CONF-9506279--7
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 199210
  • Archival Resource Key: ark:/67531/metadc667674

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  • October 1, 1995

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  • June 29, 2015, 9:42 p.m.

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  • April 5, 2016, 12:10 p.m.

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Corlett, J.N.; Barry, W.; Byrd, J.M.; Lambertson, G.; Johnson, J. & Fahmie, M. Transverse feedback systems for the PEP-II B-factory, article, October 1, 1995; California. (digital.library.unt.edu/ark:/67531/metadc667674/: accessed December 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.