Design and simulation of a mirror-mitigated thermal load on Korea-4GSR hard X-ray undulator beamline optics

The “4th generation storage ring” (4GSR) in Korea is expected to be 10–100 times brighter than Pohang Light Source II, and it gives hard X-ray undulator beamline a great advantage. In PLS-II hard X-ray undulator beamline, the first crystal of a double crystal monochromator is the first optics to handle the radiated X-ray power. However, the power and power density due to the smaller X-ray beam sizes and divergences from the Korea-4GSR are too high to handle for the first crystal itself. We present how to design a hard X-ray undulator beamline to reduce the thermal load on the first crystal of the monochromator and simulation results of a mirror-mitigated thermal loads on the Korea-4GSR hard X-ray undulator beamline optics.