Operation Status of 80 MW Klystron and 200 MW Modulator for P AL- XFEL

The construction of Pohang Accelerator Laboratory X-ray Free Electron Laser(P Al-xfel)was completed by the end of 2015. Acceleration modules used in the 4th generation electronic acceleration are 51 modules including Hard X-ray and Soft X-ray. Among the high power pulse power devices used as energy source for accelerating electrons in the 4th generation linear accelerator, the beam is being supplied to the user in 30 Hz, 4uS, SLED tune mode of the 49sets module installed in the hard X-ray. The PAL-XFEL needs a highly stable electron beam. The very stable beam voltage of a klystron-modulator is essential to provide the stable acceleration field for an electron beam. Thus, the modulator system for the XFEL requires less than 50 ppm beam voltage stability. To get this high stability on the modulator system, the inverter type HVPS is a pivot component. And the modulator needs lower noise and more smart system. The commissioning began in April 2016, and the lasing of the hard X-ray FEL was achieved on end of 2016. Beginning to provide users with beams from 2017, we will present the operating status of the Klystron-modulator when providing beams to users in 2018.