Amplitude Linearizers for PEP-II 1.2 MW Klystrons and LLRF Systems

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The PEP-II B-factory has aggressive current increases planned for luminosity through 2008. At 2.2A (HER) on 4A (LER) currents, we estimate that longitudinal growth rates will be comparable to the damping rates currently achieved in the existing low level RF and longitudinal feedback systems. Prior to having a good non-linear time domain model [1] it was postulated that klystron small signal gain non-linearity may be contributing to measured longitudinal growth rates being higher than linearly predicted growth rates. Five prototype klystron amplitude modulation linearizers have been developed to explore improved linearity in the LLRF system. The linearizers operate at 476 ... continued below

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3 pages

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Van Winkle, D.; Browne, J.; Fox, J.D.; Mastorides, T.; Rivetta, C.; Teytelman, D. et al. July 18, 2006.

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The PEP-II B-factory has aggressive current increases planned for luminosity through 2008. At 2.2A (HER) on 4A (LER) currents, we estimate that longitudinal growth rates will be comparable to the damping rates currently achieved in the existing low level RF and longitudinal feedback systems. Prior to having a good non-linear time domain model [1] it was postulated that klystron small signal gain non-linearity may be contributing to measured longitudinal growth rates being higher than linearly predicted growth rates. Five prototype klystron amplitude modulation linearizers have been developed to explore improved linearity in the LLRF system. The linearizers operate at 476 MHz with 15 dB dynamic range and 1 MHz linear control bandwidth. Results from lab measurements and high current beam tests are presented. Future development plans, conclusions from beam testing and ideas for future use of this linearization technique are presented.

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3 pages

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  • Presented atEPAC 2006Edinburgh, Scotland, , 6/26/2006-6/30/2006

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  • Report No.: SLAC-PUB-11945
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 887070
  • Archival Resource Key: ark:/67531/metadc885586

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  • July 18, 2006

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 9, 2016, 3:17 p.m.

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Van Winkle, D.; Browne, J.; Fox, J.D.; Mastorides, T.; Rivetta, C.; Teytelman, D. et al. Amplitude Linearizers for PEP-II 1.2 MW Klystrons and LLRF Systems, article, July 18, 2006; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc885586/: accessed May 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.