Report on first plasma processing trial for a FRIB quarter-wave resonator cryomodule
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arXiv
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866908797411262464 |
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| author | Hartung, Walter Chang, Wei Cheon, Yoo-Lim Elliott, Kyle Kim, Sang-Hoon Konomi, Taro Tutt, Patrick Wu, Yuting Xu, Ting |
| author_facet | Hartung, Walter Chang, Wei Cheon, Yoo-Lim Elliott, Kyle Kim, Sang-Hoon Konomi, Taro Tutt, Patrick Wu, Yuting Xu, Ting |
| contents | Plasma processing has been shown to help mitigate degradation of the performance of superconducting radio-frequency cavities, providing an alternative to removal of cryomodules from the accelerator for refurbishment. Studies of plasma processing for quarter-wave resonators (QWRs) and half-wave resonators (HWRs) are underway at the Facility for Rare Isotope Beams (FRIB), where a total of 324 such resonators are presently in operation. Plasma processing tests were done on several QWRs using the fundamental power coupler (FPC) to drive the plasma, with promising results. Driving the plasma with a higher-order mode allows for less mismatch at the FPC and higher plasma density. The first plasma processing trial for FRIB QWRs in a cryomodule was conducted in January 2024. Cold tests of the cryomodule showed a significant reduction in field emission X-rays after plasma processing. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_06732 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Report on first plasma processing trial for a FRIB quarter-wave resonator cryomodule Hartung, Walter Chang, Wei Cheon, Yoo-Lim Elliott, Kyle Kim, Sang-Hoon Konomi, Taro Tutt, Patrick Wu, Yuting Xu, Ting Accelerator Physics Plasma processing has been shown to help mitigate degradation of the performance of superconducting radio-frequency cavities, providing an alternative to removal of cryomodules from the accelerator for refurbishment. Studies of plasma processing for quarter-wave resonators (QWRs) and half-wave resonators (HWRs) are underway at the Facility for Rare Isotope Beams (FRIB), where a total of 324 such resonators are presently in operation. Plasma processing tests were done on several QWRs using the fundamental power coupler (FPC) to drive the plasma, with promising results. Driving the plasma with a higher-order mode allows for less mismatch at the FPC and higher plasma density. The first plasma processing trial for FRIB QWRs in a cryomodule was conducted in January 2024. Cold tests of the cryomodule showed a significant reduction in field emission X-rays after plasma processing. |
| title | Report on first plasma processing trial for a FRIB quarter-wave resonator cryomodule |
| topic | Accelerator Physics |
| url | https://arxiv.org/abs/2511.06732 |