Speaker
Description
Superconducting Radio Frequency (SRF) technology is a key component in many particle accelerators operating in a continuous wave, or high duty cycle, mode. The on-line performance of SRF cavities can be negatively impacted by the gradual reduction in the accelerating gradient that can be attained within a reasonable field emission level. Conventional cleaning procedures are both time- and resource-exhaustive as they are done ex-situ. Plasma processing is an emerging in-situ method of cleaning which chemically removes hydrocarbon-based field emitters through plasma. An R&D program is underway at TRIUMF with the goal to develop fundamental power coupler (FPC) driven plasma processing of the installed 1.3 GHz nine-cell cavities in the ARIEL 30 MeV SRF e-LINAC. Processing recipes have been systematically studied in single-cell and multi-cell cavities off-line. The single-cell studies involved varying the input parameters and testing the effectiveness of the treatment through RGA analysis, while the multi-cell tests focused on understanding ignition behaviors when using the TM₀₁₀ passband. The progress on these developments will be reported.
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