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First plasma processing trial of a quarter-wave resonator cryomodule at the Facility for Rare Isotope Beams

Walter Hartung, Wei Chang, Yoo-Lim Cheon, Kyle Elliott, Sang-Hoon Kim, Taro Konomi, Patrick Tutt, Yuting Wu, and Ting Xu

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Phys. Rev. Accel. Beams 29, 012003 – Published 29 January, 2026

DOI: https://doi.org/10.1103/psx7-jp78

Abstract

Studies of plasma processing for reduction of field emission in quarter-wave resonator (QWR) cryomodules are underway at the Facility for Rare Isotope Beams (FRIB), where a total of 104 QWRs are presently in operation. Driving the plasma with a higher-order mode allows for less mismatch at the fundamental power coupler and higher plasma density. The first plasma processing trial for FRIB QWRs in a cryomodule was conducted in January 2024. In-bunker cold tests of the cryomodule showed a significant reduction in field emission x-rays after plasma processing.

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Phys. Rev. Accel. Beams 29, 012003– Published 29 January, 2026
  • Received 30 July 2025
  • Accepted 3 December 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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