RF SUPERCONDUCTING EXPERIMENTS OF 1.5GHz Nb CAVITY

The project of RF superconducting cavities have been started at Peking University since 1988 and the progress has been obtained. The peparation and procedure for RF super-conducting experiments at low temperature are described in detail. RF superconducting experiments, microwave measurements, phase lock technique, the surface treatment of cavity, computer simulation for cavity design, control, data acquire and processing with computer are summaried. So far, an accelerating field of 8.6MV/m was abtained with CW mode and Q₀ of 6.5×10⁸, 2.25K.