Specifying HOM-Power Extraction in a High Average Current Short Bunch Length SRF Environment

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High average current, short bunch length beams in superconducting cavities can excite significant amounts of higher-order mode (HOM) power. The fraction that is dissipated in the cavity walls is of primary relevance as it can potentially limit the peak and average current due to the finite cryogenic capacity. A model has been developed which estimates the amount of power dissipated on the walls based on the dependence of the cavity's quality factor Q on frequency, due to BCS losses, and an analytic expression for the cavity impedance in the high frequency limit. Specifications for the HOM power extraction efficiency are ... continued below

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250 Kilobytes pages

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Merminga, L.; Krafft, G.; Leemann, C.; Sundelin, R. & Bisognano, J. August 1, 2000.

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High average current, short bunch length beams in superconducting cavities can excite significant amounts of higher-order mode (HOM) power. The fraction that is dissipated in the cavity walls is of primary relevance as it can potentially limit the peak and average current due to the finite cryogenic capacity. A model has been developed which estimates the amount of power dissipated on the walls based on the dependence of the cavity's quality factor Q on frequency, due to BCS losses, and an analytic expression for the cavity impedance in the high frequency limit. Specifications for the HOM power extraction efficiency are derived so that the cryogenic load due to the HOM excitation is of similar magnitude as the load due to the accelerating fields.

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250 Kilobytes pages

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  • Linac 2000, Monterey, CA (US), 08/21/2000--08/25/2000

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  • Report No.: JLAB-ACP-00-04
  • Report No.: DOE/ER/40150-1786
  • Report No.: JLAB-ACC-00-10
  • Grant Number: AC05-84ER40150
  • Office of Scientific & Technical Information Report Number: 769186
  • Archival Resource Key: ark:/67531/metadc720787

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  • August 1, 2000

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  • Sept. 29, 2015, 5:31 a.m.

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  • Feb. 5, 2016, 8:31 p.m.

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Merminga, L.; Krafft, G.; Leemann, C.; Sundelin, R. & Bisognano, J. Specifying HOM-Power Extraction in a High Average Current Short Bunch Length SRF Environment, article, August 1, 2000; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc720787/: accessed November 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.