Shanghai Soft X-ray Free Electron Laser Test Facility (SXFEL-TF) has been fulfilled the construction assignments and passed the acceptance check at Shanghai Institute of Applied Physics (SINAP), Chinese Academy of Sciences. The stability of microwave system is one of the major factors to get better beam performance. It is mainly determined by klystron and modulators power supply. The beam voltage stability of pulse modulator, which is the cathode voltage source of the microwave amplifier, is directly affecting the microwave amplitude and phase. The requirement of the microwave stability is 0.04% (rms) for amplitude and 0.05% (rms) for phase tolerance. This paper shows the design considerations of stability improvement and suitable upgrade scheme of the controller for Shanghai SXFEL pulse modulator.
展开▼
