Electropolishing parameters study for surface smoothening of low-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e562" altimg="si9.svg"><mml:mi>β</mml:mi></mml:math> 650 MHz five-cell niobium superconducting radio frequency cavity

Electropolishing (EP) has become a standard procedure for treating the inner surfaces of superconducting radio-frequency (SRF) cavities composed of pure niobium. In this study, a new EP facility was employed for the surface treatment of both 1.3 GHz and 3.9 GHz single-cell cavities at the Wuxi Platform. The stable “cold EP” mode was successfully implemented on this newly designed EP facility. By integrating the cold EP process with a two-step baking approach, a maximum accelerating gradient exceeding 40 MV/m was achieved in 1.3 GHz single-cell cavities. Additionally, an update to this EP facility involved the design of a special cathode system for small-aperture structures, facilitating the cold EP process for 3.9 GHz single-cell cavities. Ultimately, a maximum accelerating gradient exceeding 25 MV/m was attained in the 3.9 GHz single-cell cavities after undergoing the cold EP treatment. The design and commissioning of the EP device, as well as the electropolishing and vertical test results of the single-cell cavities, will be detailed herein. These methods and experiences are also transferable to multi-cell cavities and elliptical cavities of other frequencies.

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Electropolishing parameters study for surface smoothening of low-β 650 MHz five-cell niobium superconducting radio frequency cavity

Cited by 2 publications

References 8 publications

Enhancing the Q-Factor of a Practical Qubit Niobium Three-Dimensional λ/4-Resonator Through Surface Treatment

Enhancing the Q-Factor of a Practical Qubit Niobium Three-Dimensional λ/4-Resonator Through Surface Treatment

Investigation of Electropolishing for High-Gradient 1.3 GHz and 3.9 GHz Niobium Cavities

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