Author: Ganey, T.D.
Paper Title Page
MOYE5 In Situ Plasma Processing of Superconducting Cavities at JLab 22
 
  • T. Powers, N.C. Brock, T.D. Ganey
    JLab, Newport News, Virginia, USA
  
  Jef­fer­son Lab has an on­go­ing R&D pro­gram in plasma pro­cess­ing which is close to going into pro­duc­tion pro­cess­ing in the CEBAF ac­cel­er­a­tor. Plasma pro­cess­ing is a com­mon tech­nique for re­mov­ing hy­dro­car­bons from sur­faces, which in­creases the work func­tion and re­duces the sec­ondary 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 ini­tial focus of the ef­fort was pro­cess­ing C100 cav­i­ties by in­ject­ing RF power into the HOM cou­pler ports. Re­sults from pro­cess­ing cry­omod­ule in the cry­omod­ule test bunker as well as ver­ti­cal test re­sults will be pre­sented. We plan to start pro­cess­ing cry­omod­ules in the CEBAF tun­nel within the next year. The goal will be to im­prove the op­er­a­tional gra­di­ents and the en­ergy mar­gin 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 pro­cess­ing re­sults will also be pre­sented.  
slides icon Slides MOYE5 [2.679 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-MOYE5  
About • Received ※ 01 August 2022 — Revised ※ 08 August 2022 — Accepted ※ 11 August 2022 — Issue date ※ 01 October 2022
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