The superconducting medium beta prototype for radioactive beam acceleration at TRIUMF

A 106.08 MHz superconducting quarter wave resonator, based on the bulk niobium technology developed at LNL for low beta heavy ion linacs, has been designed, constructed and tested in a collaboration between INFN-LNL and TRIUMF. This /spl beta/=0.072 cavity is the medium /spl beta/ prototype for the superconducting heavy ion linac of ISAC-II, the future extension to the present ISAC radioactive beam facility. The extension will also include /spl beta/=0.042 and /spl beta/=0.105 sections. Cavity, design characteristics and test results will be reported.