• Open Access

Beam-induced wakefield observation in X-band choke-mode cavities

Hao Zha, Chunguang Jing, Jiaqi Qiu, Eric E. Wisniewski, Manoel Conde, John G. Power, Darrell S. Doran, Wanming Liu, Jiaru Shi, Chen Li, Wei Gai, and Huaibi Chen
Phys. Rev. Accel. Beams 19, 081001 – Published 1 August 2016

Abstract

The X-band choke-mode structure is currently being studied as an alternative design for the accelerating structure of the compact linear collider (CLIC) main linac. The geometry of the choke-mode structure is designed to ensure the strong suppression of the beam-induced long-range transverse wakefield and therefore maintain the stability and quality of the beam in the CLIC main linac. Experiments conducted at the Argonne Wakefield Accelerator Facility are presented in this study to verify the design of the wakefield suppressor. The beam-induced radio frequency (rf) signals in a three-cell choke-mode structure were measured, and measured results show good agreement with the simulation results. The measured results also show strong damping in high-order dipolar modes with a quality factor Q of 10 to 20. The difference between the frequencies of the first and second dipole modes is about 3 GHz, which validates the special design of the cancelling dipole modes at the time of the succeeding bunch (0.5 ns).

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  • Received 11 February 2016

DOI:https://doi.org/10.1103/PhysRevAccelBeams.19.081001

This article is available under the terms of the Creative Commons Attribution 3.0 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

Hao Zha1,2,4, Chunguang Jing2,3,*, Jiaqi Qiu2,3, Eric E. Wisniewski2, Manoel Conde2, John G. Power2, Darrell S. Doran2, Wanming Liu2, Jiaru Shi1,4,†, Chen Li1,2, Wei Gai1,2, and Huaibi Chen1

  • 1Department of Engineering Physics, Tsinghua University, Beijing 100086, China
  • 2Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 3Euclid Tech labs LLC, Solon, Ohio 44139, USA
  • 4CERN, European Organization for Nuclear Research, Geneva 1211, Switzerland

  • *jingchg@anl.gov
  • shij@mail.tsinghua.edu.cn

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Vol. 19, Iss. 8 — August 2016

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