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TY - CPAPER AU - Tyagi, P.V. AU - Afanador, R. AU - DeGraff, B. AU - Doleans, M. AU - Hannah, B.S. AU - Howell, M.P. AU - Kim, S.-H. AU - Mammosser, J.D. AU - McMahan, C.J. AU - Saunders, J. AU - Stewart, S.E. TI - Surface Studies of Plasma Processed Nb Samples J2 - Proc. of International Conference on RF Superconductivity (SRF2015), Whistler, BC, Canada, Sept. 13-18, 2015 AB - Contaminants present at top surface of superconducting radio frequency (SRF) cavities can act as field emitters and restrict the cavity accelerating gradient. A room temperature in-situ plasma processing technology for SRF cavities aiming to clean hydrocarbons from inner surface of cavities has been recently developed at the Spallation Neutron Source (SNS). Surface studies of the plasma processed Nb samples by Secondary ion mass spectrometry (SIMS) and Scanning Kelvin Probe (SKP) showed that the NeO2 plasma processing is very effective to remove carbonaceous contaminants from top surface and improves the surface work function by 0.5 to 1.0 eV. PB - JACoW CY - Geneva, Switzerland SP - 438 EP - 442 KW - plasma KW - cavity KW - vacuum KW - SRF KW - ion DA - 2015/12 PY - 2015 SN - 978-3-95450-178-6 DO - 10.18429/JACoW-SRF2015-MOPB115 UR - http://srf2015.vrws.de/papers/mopb115.pdf ER -