Speaker
Description
In this study, we conduct plasma processing experiments to improve performance of hydrocarbon contaminated mid-T baked cavities. Field emission (FE) is one of the main factors that limit performance of superconducting radiofrequency (SRF) cavities. To mitigate the impact of FE, we conducted experimental research on a dedicated medium-temperature (mid-T) baked 1.3 GHz single-cell cavity equipped with two higher order mode (HOM) couplers. Our study initiated with the cleaning of carbon-based permanent marker stains, followed by cleaning ethanol contamination. The first experiment was time-consuming but yielded an intuitive result: after around 105 hours of plasma cleaning with RF power input through a HOM couplers, the area covered by marker stains was significantly reduced. The second experiment utilized an ethanol/neon gas mixture to excite plasma within the cavity, enabling ethanol deposition on the cavity surface, followed by plasma processing. The results showed significant changes in the cavity performance before and after processing. This study demonstrates that plasma processing can restore cavity performance while maintaining the high-Q characteristics of mid-T baked SRF cavities and significantly reduce FE.
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