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TY - CONF AU - Furuta, F. AU - Ge, M. AU - Gruber, T. AU - Hall, T.D. AU - Inman, M.E. AU - Kaufman, J.J. AU - Koufalis, P.N. AU - Liepe, M. AU - Radhakrishnan, R. AU - Sears, J. AU - Snyder, S.T. AU - Taylor, E.J. ED - Koscielniak, Shane ED - Satogata, Todd ED - Schaa, Volker RW ED - Thomson, Jana TI - HF Free Bipolar Electro-Polishing Studies on Niobium SRF Cavities at Cornell With Faraday Technology J2 - Proc. of IPAC2018, Vancouver, BC, Canada, April 29-May 4, 2018 C1 - Vancouver, BC, Canada T2 - International Particle Accelerator Conference T3 - 9 LA - english AB - Cornell's SRF group and Faraday Technology have been collaborating on two phase-II SBIR projects. One of them is the development and commissioning of a 9-cell scale HF free Bipolar Electro-Polishing (BEP) system. Faraday Technology has upgraded their 1.3 GHz single-cell BEP system for hosting 9-cell cavities. Initial commissioning of the new system was done with a three single-cell cavity string, and high a gradient of 40MV/m was demonstrated during the RF tests at Cornell. After this success with the test string, the 9-cell cavity was processed with the new system at Faraday and RF test was performed at Cornell. Here we report detailed results from these 9-cell scale HF free BEP studies. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2443 EP - 2446 KW - cavity KW - SRF KW - niobium KW - MMI KW - radio-frequency DA - 2018/06 PY - 2018 SN - 978-3-95450-184-7 DO - 10.18429/JACoW-IPAC2018-WEPMF037 UR - http://jacow.org/ipac2018/papers/wepmf037.pdf ER -