Machine Performance of PAL-XFEL

Abstract

The hard XFEL operation procedure established at PAL-XFEL using e-BBA and incorporating undulator radiation spectrum analysis proved to be highly reliable and robust, and essential for the variable-gap undulators. The state-of-the-art design of the electron linear accelerator along with the reliable FEL lasing procedure has allowed reliable operation of PAL-XFEL with unprecedented stability in terms of orbit, energy, and timing; FEL position stability: 8 ~ 9% of beam size, FEL power stability: ~ 4.0% rms, FEL timing jitter: < 20 fs, which can obviously make users’ experiments more successful. And the undulator optics matching using the wire-scanner-based emittance measurement is extensively used to maximize the FEL intensity even at higher photon energy up to 14.5 keV, which is the brightest FEL at this photon energy that has ever been achieved in the world.