Publications
Publication Information
| Title | Method for In-Situ and In-Operando Cavity Loaded Q-Extraction in SRF Accelerators | ||
| Authors | Frank Marhauser | ||
| JLAB number | JLAB-ACC-20-3198 | ||
| LANL number | (None) | ||
| Other number | DOE/OR/23177-4976 | ||
| Document Type(s) | (Journal Article) | ||
| Category: | SRF Technology |
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| Associated with EIC: | No | ||
| Supported by Jefferson Lab LDRD Funding: | No | ||
| Funding Source: | Nuclear Physics (NP) | ||
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Journal Compiled for Physical Review Special Topics AB Volume 24 Page(s) 032001 Refereed | |||
| Publication Abstract: | A novel method has been developed that allows extracting the loaded quality factor of particle accelerating radio frequency cavities at any time during beam operation from acquired control system process parameters without the need of additional measurement equipment. Concurrently it assesses the attenuation in a cavities' power transmission line to correct inaccuracies of measured forward and reflected power levels. The mathematical formalism is described and is specifically derived for cryogenically cooled superconducting cavities and for which the loaded quality factor can be equated with the external quality factor of the input power coupler. The described method has been applied for 418 superconducting cavities in operation at the Continuous Electron Beam Accelerator Facility at the Thomas Jefferson National Accelerator Facility. The validation of the method as well as its beneficial use as a diagnostic tool is demonstrated for a finite number of examples utilizing process variables archived during a time period in the past when the linac beam current was ramped up. The method is in the process to be implemented in the machines control system for an in-situ and in-operando evaluation of the power coupler's external quality factor. | ||
| Experiment Numbers: | other | ||
| Group: | SRF Research & Dev | ||
| Document: | |||
| DOI: | https://doi.org/10.1103/PhysRevAccelBeams.24.032001 | ||
| Accepted Manuscript: | PhysRevAccelBeams.24.032001.pdf | ||
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