Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 169, Issue 6, Pages -Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1945-7111/ac7354
Keywords
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Funding
- US Department of Energy Thomas Jefferson National Accelerator Facility
- U.S. Department of Energy, Office of Science, Office of Nuclear Physics [DE-AC05-06OR23177]
- U.S. Department of Energy [DE-AC05-06OR23177]
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In this study, a finite element model was developed to investigate the electrochemical polishing mechanisms of niobium in superconducting radio-frequency cavities. It was found that a low temperature coolant with intermediate flow rate can improve the polishing effect.
Niobium (Nb) used in superconducting radio-frequency cavities requires smooth surface to achieve optimal performance. In this work, a finite element model that coupled electrochemistry, heat transfer, and fluid dynamics was developed to investigate the electrochemical polishing mechanisms of Nb, using experimentally measured polarization results of coupon samples as validations. The current and potential distribution, oxide growth kinetics of Nb in a complex cavity geometry was investigated as a function of temperature and coolant flow. A low temperature coolant with intermediate flow rate was found to reduce surface current and ensure oxide uniformity. These results could shed light on the design of future particle accelerators. (C) 2022 The Electrochemical Society (ECS). Published on behalf of ECS by IOP Publishing Limited.
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