Author: Gonnella, D.
Paper Title Page
TUPO058 Cool Down Studies for the LCLS-II Project 470
 
  • M. Ge, M. Liepe
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
  • D. Gonnella
    SLAC, Menlo Park, California, USA
  • J. Sears
    Cornell University, Ithaca, New York, USA
  
  The qual­ity fac­tor of the ni­tro­gen-doped SRF cav­i­ties for the LCLS-II pro­ject are strongly im­pacted by cool down speed. A suf­fi­ciently fast cool down speed can pro­duce large ther­mal gra­di­ent across a cav­ity and suf­fi­ciently expel mag­netic flux when the cav­ity wall passes from the nor­mal-con­duct­ing to the su­per­con­duct­ing state. How­ever, in­stru­men­ta­tion in LCLS-II pro­duc­tion cry­omod­ules has been kept at a min­i­mum, and ad­di­tional in­for­ma­tion dur­ing the cool down of the mod­ules is there­fore de­sir­able. In this work, we study if and how RF data can be used dur­ing cav­ity cool-down to de­ter­mine the tran­si­tion speeds of the in­di­vid­ual cav­i­ties in the LCLS-II linac.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO058  
About • paper received ※ 19 September 2018       paper accepted ※ 20 September 2018       issue date ※ 18 January 2019  
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