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TY - UNPB AU - Doleans, M. AU - Afanador, R. AU - Ball, J.A. AU - Barnhart, D.L. AU - Blokland, W. AU - Crofford, M.T. AU - DeGraff, B. AU - Hannah, B.S. AU - Howell, M.P. AU - Kim, S.-H. AU - Lee, S.W. AU - Mammosser, J.D. AU - McMahan, C.J. AU - Neustadt, T.S. AU - Saunders, J. AU - Stewart, S.E. AU - Strong, W.H. AU - Tyagi, P.V. AU - Vandygriff, D.M. TI - Plasma Processing to Improve SRF Accelerating Gradient J2 - Proc. of International Conference on RF Superconductivity (SRF2015), Whistler, BC, Canada, Sept. 13-18, 2015 AB - A new In-situ plasma processing technique is being developed at the SNS (Spallation Neutron Source) to improve the performance of the cavities in operation. The technique utilizes a reactive low-density room-temperature plasma to remove top-surface hydrocarbons. This increases the work function of the cavity surface and reduces the overall amount of electron activity; In particular it increases the field-emission onset, which enables to operate a cavity at higher accelerating gradient. Development of the basic plasma processing parameters and effect on the Niobium surface can be found elsewhere *,**. Details on the results for in-situ plasma processing of dressed cavities in the SNS HTA (horizontal test apparatus) will be reported here. PB - JACoW CY - Geneva, Switzerland ER -