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- W4226335946 abstract "Jefferson Lab began a plasma processing program start-ing in the spring of 2019. Plasma processing is a common technique for removing hydrocarbons from surfaces, which increases the work function and reduces the sec-ondary emission coefficient. Unlike helium processing which relies on ion bombardment of the field emitters, plasma processing uses free oxygen produced in the plasma to break down the hydrocarbons on the surface of the cavity. The residuals of the hydrocarbons in the form of water, carbon monoxide and carbon dioxide are re-moved from the cryomodule as part of the process gas flow. The initial focus of the effort is processing C100 cavities by injecting RF power into the HOM coupler ports. We will then start investigating processing of C50 cavities by introducing RF into the fundamental power coupler. The plan is to start processing cryomodules in the CEBAF tunnel in the mid-term future, with a goal of improving the operational gradients and the energy mar-gin of the linacs. This work will describe the systems and methods used at JLAB for processing cavities using an argon oxygen gas mixture. Before and after plasma pro-cessing results will also be presented." @default.
- W4226335946 created "2022-05-05" @default.
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- W4226335946 date "2022-04-06" @default.
- W4226335946 modified "2023-09-27" @default.
- W4226335946 title "In Situ Plasma Processing of Superconducting Cavities at Jefferson Lab" @default.
- W4226335946 doi "https://doi.org/10.48550/arxiv.2204.02903" @default.
- W4226335946 hasPublicationYear "2022" @default.
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