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TY - CPAPER AU - Furuta, F. AU - Elmore, B. AU - Ge, G.M. AU - Gruber, T. AU - Hall, T.D. AU - Hayano, H. AU - Hoffstaetter, G.H. AU - Ida, Y.I. AU - Inman, M.E. AU - Krebs, D.K. AU - Nii, K.N. AU - Saeki, T. AU - Sears, J. AU - Snyder, S.T. AU - Taylor, E.J. TI - Vertical Electropolishing Studies at Cornell J2 - Proc. of International Conference on RF Superconductivity (SRF2015), Whistler, BC, Canada, Sept. 13-18, 2015 AB - Vertical Electro-Polishing (VEP) has been developed and applied on various SRF R&Ds at Cornell as primary surface process of Nb. Recent achievements had been demonstrated with nitrogen doped high-Q cavities for LCLS-II. Five 9-cell cavities processed with VEP and nitrogen doping at Cornell showed the high average Qo value of 3.0·10¹⁰ at 16MV/m, 2K, during vertical test. this achievement satisfied the required cavity specification values of LCLS-II(2.7·10¹⁰ at 16MV/m, 2K). We will report the details of these achievements and new VEP collaboration projects between Cornell and companies. PB - JACoW CY - Geneva, Switzerland SP - 364 EP - 367 KW - cavity KW - cathode KW - SRF KW - niobium KW - target DA - 2015/12 PY - 2015 SN - 978-3-95450-178-6 DO - 10.18429/JACoW-SRF2015-MOPB093 UR - http://srf2015.vrws.de/papers/mopb093.pdf ER -