Present status of the synchrotron of the Wakasa Wan Energy Research Center

The accelerator complex at the Wakasa Wan Energy Research Center (WERC) consists of a 5 MV Schenckel type tandem accelerator and a 200 MeV proton synchrotron. Using this system, the element analysis, medical, biological and material sciences are performed. In the 2015 fiscal year of the period from May 11, 2015 to April 1, 2016, experimental time amounted 2051 hours. The percentage of experiment time using the synchrotron was 49.7%. Also we report development of LLRF system. In our system, the phase noise superimposed on RF causes to excite phase oscillation of beam bunch. The problem of the system is that the frequency multiplier which 10 multiplies the frequency generated by DDS amplifies phase noise. In the improvement plan, DDS directly generates RF frequency to eliminate the frequency multiplier. On the other hand, a signal to detect the cavity voltage must be produced by up-conversion. The detail design is reported. Also, calibration of cavity voltage using beam is reported. (author)