Author: Berrutti, P.
Paper Title Page
Plasma Processing to Reduce Field Emission in LCLS-II 1.3 GHz SRF Cavities  
  • B. Giaccone, P. Berrutti, M. Martinello
    Fermilab, Batavia, Illinois, USA
  • B. Giaccone
    IIT, Chicago, Illinois, USA
  A collaboration between FNAL, SLAC and ORNL is working to develop plasma processing for 1.3GHz LCLS-II cavities. Key strength of this technique is that it can be applied in situ inside the cryomodule to mitigate field emission due to hydrocarbon contamination. A new method that uses Higher Order Modes has been developed at FNAL for plasma ignition and plasma transfer inside the 9-cell cavity. Plasma processing has been applied to multiple single cell and 9-cell cavities showing positive results; its effectiveness is discussed in terms of Q and Radiation vs E performance before and after processing.  
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