Nowadays the structural study of phase transition in material under high-pressure condition plays an important role in expanding the understandings of physical and chemical properties of material.  To support miscellaneous applications for high-pressure research in Thailand, an experimental setup of x-ray powder diffraction (XRPD) technique under high-pressure condition using synchrotron radiation, which is based on the station 9.1 at the SRS, is developed on the bending magnet beamline BL8 at the Siam Photon Laboratory. Monochromatic x-rays with photon energy of 9 keV is provided by a fixed-exit double crystal monochromator equipped with Ge(220) crystals. A diamond anvil cell (DAC) is used for generating high-pressure conditions in a powder sample. Quasi-hydrostatic pressure in DAC is determined by ruby fluorescent technique. In our recent study, we can record the complete diffraction pattern from the hexagonal phase of ZnO using an image plate area detector. For the improvement of diffraction intensity collected at this station, a double multilayer monochromator (DMM) and a focusing mirror are required for upgrading the existing beamline or configuring a new one.  Results from ray-tracing simulation for the proposed optics will be presented.

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