Field emission mitigation studies in LCLS-II cavities via in situ plasma processing
arXiv:2009.05081 · doi:10.1103/PhysRevAccelBeams.24.022002
Abstract
Field emission is one of the factors that can limit the performance of superconducting radio frequency cavities. In order to reduce possible field emission in LCLS-II (Linac Coherent Light Source II), we are developing plasma processing for 1.3 GHz 9-cell cavities. Plasma processing can be applied in situ in the cryomodule to mitigate field emission related to hydrocarbon contamination present on the cavity surface. In this paper, plasma cleaning was applied to single cell and 9-cell cavities, both clean and contaminated; the cavities were cold tested before and after plasma processing in order to compare their performance. It was proved that plasma cleaning does not negatively affect the nitrogen doping surface treatment; on the contrary, it preserves the high quality factor and quench field. Plasma processing was also applied to cavities with natural field emission or artificially contaminated. It was found that this technique successfully removes carbon-based contamination from the cavity iris and that it is able to remove field emission in a naturally field emitting cavity. Vacuum failure experiments were simulated on four cavities, and in some cases plasma processing was able to achieve an increase in performance.
arXiv comment10 pages, 10 figures
References in corpus (5)
- The Superconducting TESLA Cavities
- Nitrogen and argon doping of niobium for superconducting radio frequency cavities: a pathway to highly efficient accelerating structures
- Effect of interstitial impurities on the field dependent microwave surface resistance of niobium
- Analysis of RF losses and material characterization of samples removed from a Nb3Sn-coated superconducting RF cavity
- Low RF power plasma ignition and detection for in-situ cleaning of 1.3 GHz 9-cell cavities