Speaker
Takeyoshi Goto
(High Energy Accelerator Research Organization)
Description
Electropolishing (EP) is used for the surface treatment of Nb cavities used in superconducting accelerators. The electrolyte for Nb material EP is a mixture of hydrofluoric acid and sulfuric acid, which makes EP work in Nb cavities very expensive. In this study, the development of a new EP method for Nb cavity using fluoride salts and organic solvents will be reported. The organic solvents with high flash point and high relative permittivity, such as ethylene glycol and formamide were chosen. It was found that an electrolyte solution of ammonium fluoride dissolved in ethylene glycol (2 M) could be used for mirror finish
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Author
Takeyoshi Goto
(High Energy Accelerator Research Organization)
