Publications
Publication Information
| Title | Evidence of increased radio-frequency losses in CEBAF cavities from the fundamental power coupler cold window |
| Authors | Frank Marhauser, Gianluigi Ciovati |
| JLAB number | JLAB-ACC-21-3480 |
| LANL number | (None) |
| Other number | DOE/OR/23177-5300 |
| Document Type(s) | (Journal Article) |
| Category: | SRF Technology |
| Associated with EIC: | No |
| Supported by Jefferson Lab LDRD Funding: | No |
| Funding Source: | Nuclear Physics (NP) |
|
Journal Compiled for Physical Review Accelerators and Beams Volume 24 Page(s) 092001 Refereed | |
| Publication 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. |
| Experiment Numbers: | other |
| Group: | SRF Research & Dev |
| Document: | |
| DOI: | https://doi.org/10.1103/PhysRevAccelBeams.24.092001 |
| Accepted Manuscript: | ZG10175_rev.pdf |
| Supporting Documents: | |
| Supporting Datasets: | |