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TY - UNPB AU - Tian, H. ED - Schaa, Volker RW ED - He, Yuan ED - Li, Lu ED - Zhao, Ning TI - Progress with Bipolar HF-free EP and other VEP of Niobium Cavities J2 - Proc. of SRF2017, Lanzhou, China, July 17-21, 2017 C1 - Lanzhou, China T2 - International Conference on RF Superconductivity T3 - 18 LA - english AB - In collaboration with Faraday Technologies and KEK, JLab has been developing HF-free EP of Nb cavities via pulse-reversed electropolishing using several different HF-free electrolytes. Bench-scale process analytics have yielded a systematic way of characterizing the processes, identifying effective polishing parameters, and are guiding application to single and multi-cell cavities. JLab has developed a low-cost pulse control technique and implemented it in a vertical EP processing tool integrated into the JLab cleanroom suite. The polishing process dynamics for different electrolytes, the implementation in the JLab tool, and the effectiveness in application to single cell and multi-cell cavities will be reviewed. VEP development work at Cornell includes both HF-free EP and the HF-based electrolyte using novel cathode and stirring configuration. PB - JACoW CP - Geneva, Switzerland ER -