Present Status of RF System for Medical Proton Synchrotron

The 200MeV proton synchrotron of circumference of 9.54m is being developed for medical radiotherapy. The rf system has been carried out with a wide bandwidth of frequency sweeping from 2.0MHz to 17.8MHz. The rf cavity is designed of a compact dimension and a high acceleration gradient. The high power test of the rf system has been successfully performed and maximal acceleration gradient of 60kV/m has been achieved. The experiments with rf feedback control system tracking to the exciting current of bending magnets are being studied In this paper, the recent progress of the rf system and test results will be presented in detail.