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Multipactoring zone map of an rf input coupler and its application to high beam current storage rings

Tetsuo Abe*, Tatsuya Kageyama, Kazunori Akai, Kiyokazu Ebihara, Hiroshi Sakai, and Yasunao Takeuchi

  • Accelerator Laboratory, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan

  • *Electronic address: tetsuo.abe@kek.jp
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Phys. Rev. ST Accel. Beams 9, 062002 – Published 20 June, 2006

DOI: https://doi.org/10.1103/PhysRevSTAB.9.062002

Abstract

Multipactoring phenomena in a radio frequency (rf) input coupler, which could cause serious problems during accelerator operation, are described based on electrodynamics with the superposition state of the input and reflected waves in the coupler. Since the reflection coefficient varies widely with the beam loading in the case of high beam current storage rings, multipactoring zones should be represented in the two-dimensional space of the input rf power and the reflection coefficient. Based on this map, we have performed a simulation study for normal-conducting rf accelerating cavities and developed a method to operate an rf cavity with multipactoring problems so as to minimize the influence of multipactoring.

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Phys. Rev. ST Accel. Beams 9, 062002– Published 20 June, 2006
  • Received 16 November 2005
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