Present status of J-PARC Ring RF systems

The rapid cycling synchrotron (RCS) radio frequency accelerating systems have been prepared for the beam commissioning scheduled in the middle of September 2007. Installations of cavities, power supplies and amplifiers were carried out. Also, the systems have been checked for the combined operations. For the main synchrotron (50 GeV-MR) accelerating systems, the high power examinations and final adjustments are ongoing. Installations are planned for September 2007. Here, we report on various issues that had been found and solved during the examination and installation period.