Synchrotron beamline optics for X-ray powder diffraction under high-pressure conditions at the Siam Photon Laboratory

摘要

To support various applications for high-pressure research in Thailand, an ex-perimental setup for X-ray powder diffraction under high-pressure conditions using synchro-tron radiation, which is based on station 9.1 at the Daresbury Synchrotron Radiation Source,is being developed on the bending magnet beamline BL8 at the Siam Photon Laboratory.Monochromatic X-rays with a photon energy of 9 keV are provided by a fixed-exit doublecrystal monochromator equipped with Ge(220) crystals. In a recent experiment, we couldrecord a complete diffraction pattern of the hexagonal phase of ZnO using an image platearea detector. However, diffraction intensity should be improved by adding focusing optics.In this work, we propose the use of a double multilayer monochromator in combination witha focusing mirror. Results from ray-tracing simulation for the proposed optics will be pre-sented.