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High-gradient breakdown studies of an X-band Compact Linear Collider prototype structure

Xiaowei Wu, Jiaru Shi, Huaibi Chen, Jiahang Shao, Tetsuo Abe, Toshiyasu Higo, Shuji Matsumoto, and Walter Wuensch
Phys. Rev. Accel. Beams 20, 052001 – Published 8 May 2017

Abstract

A Compact Linear Collider prototype traveling-wave accelerator structure fabricated at Tsinghua University was recently high-gradient tested at the High Energy Accelerator Research Organization (KEK). This X-band structure showed good high-gradient performance of up to 100MV/m and obtained a breakdown rate of 1.27×108 per pulse per meter at a pulse length of 250 ns. This performance was similar to that of previous structures tested at KEK and the test facility at the European Organization for Nuclear Research (CERN), thereby validating the assembly and bonding of the fabricated structure. Phenomena related to vacuum breakdown were investigated and are discussed in the present study. Evaluation of the breakdown timing revealed a special type of breakdown occurring in the immediately succeeding pulse after a usual breakdown. These breakdowns tended to occur at the beginning of the rf pulse, whereas usual breakdowns were uniformly distributed in the rf pulse. The high-gradient test was conducted under the international collaboration research program among Tsinghua University, CERN, and KEK.

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  • Received 13 October 2016

DOI:https://doi.org/10.1103/PhysRevAccelBeams.20.052001

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Accelerators & Beams

Authors & Affiliations

Xiaowei Wu1,2, Jiaru Shi1,2,4,*, Huaibi Chen1,2, Jiahang Shao1,2, Tetsuo Abe3, Toshiyasu Higo3, Shuji Matsumoto3, and Walter Wuensch4

  • 1Department of Engineering Physics, Tsinghua University, Beijing CN-100084, China
  • 2Key Laboratory of Particle and Radiation Imaging, Tsinghua University, Ministry of Education, Beijing CN-100084, China
  • 3KEK, High Energy Accelerator Research Organization, Tsukuba 305-0801, Japan
  • 4The European Organization for Nuclear Research, Geneva CH-1211, Switzerland

  • *shij@mails.tsinghua.edu.cn

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Vol. 20, Iss. 5 — May 2017

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