Improvement of the Assembly between Cavity Flanges and the BCP Facility at IMP

The Buffered Chemical Polishing(BCP),consisting of one volume of 40%HF,one volume of 65%HNO_(3) and two volumes of 85%H_(3)PO_(4),has been considered as a popular method for etching the inner surfaces of niobium cavities after its fabrication,especially for lowβ(β<0.3)cavities.