Latest Development of Electropolishing Optimization for 650 MHz Niobium Cavity

2024/01/26 by Vijay Chouhan, Chouhan, V., D. Bice +33
Physics and Astronomy · #Accelerator Physics (physics.acc-ph) #FOS: Physical sciences #Gyrotron and Vacuum Electronics Research

paper · pdf · doi:10.48550/arxiv.2401.15157

openalex publication_date 2024/01/26 · openalex created_date 2024/02/02 · openalex updated_date 2026/08/01

Abstract

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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