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TY - CONF AU - Tian, H. AU - Carroll, J. AU - Hall, T.D. AU - Inman, M.E. AU - Radhakrishnan, R. AU - Reece, C.E. AU - Straka, B. AU - Taylor, E.J. ED - Schaa, Volker RW ED - Pei, Guoxi ED - Chin, Yong Ho ED - Fu, Shinian ED - Zhao, Ning TI - New Progress with HF-free Chemical Finishing for Nb SRF Cavities J2 - Proc. of LINAC2018, Beijing, China, 16-21 September 2018 CY - Beijing, China T2 - Linear Accelerator Conference T3 - 29 LA - english AB - Jefferson Lab has implemented a bipolar pulsed electropolishing system for final chemical processing of niobium SRF cavities. This FARADAYIC bi-polar electropolishing (BPEP) has been applied to single cells, a 7-cell CEBAF C100 cavity, and to 9-cell TESLA-style cavities.* As a mechanistic characterization of the process emerges, the critical role played by the local current density during each cathodic pulse is becoming clear. This influences system and operational parameter refinement. We present current process parameters, removal characterization, and rf performance of the processed cavities. This is the fruit of collaborative work between Jefferson Lab and Faraday Technology, Inc. directed toward the routine commercialization and industrialization of niobium cavity processing. We also present supporting data from controlled-parameter coupon studies PB - JACoW Publishing CP - Geneva, Switzerland SP - 431 EP - 434 KW - cavity KW - SRF KW - niobium KW - controls KW - ECR DA - 2019/01 PY - 2019 SN - 2226-0366 SN - 978-3-95450-194-6 DO - DOI: 10.18429/JACoW-LINAC2018-TUPO043 UR - http://jacow.org/linac2018/papers/tupo043.pdf ER -