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1 Introduction Four superconducting QWR cavities will be used in HI-13 tandem accelerator upgrade project (BRIF). These niobium coated cavities will be produced by CIAE. Up to now, a niobium sputtering
1 Introduction Four superconducting QWR cavities will be used in HI-13 tandem accelerator upgrade project (BRIF). These niobium coated cavities will be produced by CIAE. Up to now, a niobium sputtering