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TY - UNPB AU - Giaccone, B. AU - Berrutti, P. AU - Martinello, M. ED - Schaa, Volker RW TI - Plasma Processing to Reduce Field Emission in LCLS-II 1.3 GHz SRF Cavities J2 - Proc. of IPAC2020, Caen, France, 10-15 May 2020 CY - Caen, France T2 - International Particle Accelerator Conference T3 - 11 LA - english AB - 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. PB - JACoW Publishing CP - Geneva, Switzerland ER -