STI Publications - View Publication Form #16745
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Publication Information
| Title | Evidence of increased radio-frequency losses in CEBAF cavities from the fundamental power coupler cold window | ||||
| Abstract | High radio-frequency (rf) losses measured for cavities in original CEBAF cryomodules, compared to the losses measured in single-cavity tests, have been a long-standing issue related to their performance. We summarize experimental evidence of increased rf losses in CEBAF cavities arising from the fundamental power coupler cold window and waveguide, respectively. Cryogenic rf tests were done on cavities tested in vertical cryostats as well as inside cryomodules in the accelerator tunnel. The cold window metallization losses were assessed combining numerical results with measured data obtained with an existing waveguide resonator setup. The results showed that the cold window metallization losses can increase the cavity RF heat load at 2.07 K by up to 86%, depending on the standing-wave pattern in the fundamental power coupler waveguide, and that such losses are reduced if the distance between the waveguide and the cavity cells is increased. | ||||
| Author(s) | Frank Marhauser, Gianluigi Ciovati | ||||
| Publication Date | September 2021 | ||||
| Category | SRF Technology | ||||
| Document Type | Journal Article | ||||
| Primary Institution | Thomas Jefferson National Accelerator Facility, Newport News | ||||
| Affiliation | Accelerator Ops, R&D / Inst for SRF Sci & Tech / SRF Research & Dev | ||||
| Funding Source | Nuclear Physics (NP) | ||||
| Proprietary? | No | ||||
| This publication conveys | Technical Science Results | ||||
| Document Numbers |
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| Associated with an experiment | No | ||||
| Associated with EIC | No | ||||
| Supported by Jefferson Lab LDRD Funding | No |
Journal Article
| Journal Name | Physical Review Accelerators and Beams |
| Refereed | Yes |
| Volume | 24 |
| Issue | |
| Page(s) | 092001 |
Attachments/Datasets/DOI Link
| Document(s) |
PRAB_windowlosses1.pdf
(STI Document)
ZG10175_rev.pdf
(Accepted Manuscript)
PhysRevAccelBeams.24.092001.pdf
(Accepted Manuscript)
PhysRevAccelBeams.24.092001.pdf
(Accepted Manuscript)
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| DOI Link | |
| Dataset(s) | (none) |
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