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Design, fabrication, and test of a parallel-coupled slow-wave high-gradient structure for short input power pulses

Weihang Gu, Hao Zha, Jiaru Shi, Yuliang Jiang, Xiancai Lin, Focheng Liu, Jian Gao, An Li, Fangjun Hu et al.

Qingzhu Li, Qiang Gao, and Huaibi Chen

  • Department of Engineering Physics, Tsinghua University, Beijing CN-100084, China and Key Laboratory of Particle and Radiation Imaging, Tsinghua University, Ministry of Education, Beijing CN-100084, China

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Phys. Rev. Accel. Beams 28, 060401 – Published 2 June, 2025

DOI: https://doi.org/10.1103/dqpb-hst9

Abstract

Tsinghua University has designed an X-band (11.424 GHz) slow-wave parallel-coupled ten-cell standing-wave accelerator structure, operated it at a high gradient with 40-ns-long rf pulses. Unexpected bead-pull results were observed during the cold testing, which we attribute to intercavity coupling. To explain these results, a multicell coupling circuit model was developed and used to analyze the data. High-power testing was conducted on the TPOT-X platform, achieving a highest gradient of 130  MV/m after 1.1×107 conditioning pulses. Compared to conventional multicavity high-gradient structures, the distributed power feeding system offers a shorter conditioning period and demonstrates the potential to achieve higher accelerating gradients under short-pulse operation.

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Phys. Rev. Accel. Beams 28, 060401– Published 2 June, 2025
  • Received 8 January 2025
  • Accepted 15 May 2025
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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.

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