Latest Development of Electropolishing Optimization for 650 MHz Niobium Cavity

(2) Argonne National Laboratory); A. Cravatta (1); A. Netepenko (1); B. Guilfoyle (2); D. Bice (1); D. Burk (1); F. Furuta (1); G. V. Eremeev (1); G. Wu (1); H. Park (1)

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Latest Development of Electropolishing Optimization for 650 MHz Niobium Cavity

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arxiv 2401.15157 v1 pith:RMWX7SCN submitted 2024-01-26 physics.acc-ph

V. Chouhan (1) , D. Bice (1) , D. Burk (1) , S. Chandrasekaran (1) , A. Cravatta (1) , P. Dubiel (1) , G. V. Eremeev (1) , F. Furuta (1)

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O. Melnychuk (1) A. Netepenko (1) M. K. Ng (1) J. Ozelis (1) H. Park (1) T. Ring (1) G. Wu (1) B. Guilfoyle (2) M. P. Kelly (2) T. Reid (2) (the PIP-II Collaboration) ((1) Fermi National Accelerator Laboratory (2) Argonne National Laboratory)

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keywords surfacecavitycavitiesniobiumsmoothelectropolishingparametersaccelerating

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Electropolishing (EP) of 1.3 GHz niobium superconducting RF cavities is conducted to achieve a desired smooth and contaminant-free surface that yields good RF performance. Achieving a smooth surface of a large-sized elliptical cavity with the standard EP conditions was found to be challenging. This work aimed to conduct a systematic parametric EP study to understand the effects of various EP parameters on the surface of 650 MHz niobium cavities used in the Proton Improvement Plan-II (PIP-II) linear accelerator. Parameters optimized in this study provided a smooth surface of the cavities. The electropolished cavity showed significantly a higher accelerating gradient meeting baseline requirement and qualified for further surface treatment to improve the cavity quality factor.

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