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Nirei, Masami; Shinohara, Akira*; Nakanishi, Takashi*; Kawamura, Seiko; Akiba, Hiroshi*; Yamamuro, Osamu*; Kofu, Maiko
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Kawakita, Yukinobu
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Hattori, Takanori
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I introduce recent developments in high-pressure techniques and their application at J-PARC. Static structures at high pressures are investigated at the BL11 PLANET beamline over a wide PT region of 0-17 GPa and 77-1300 K. The beamline optics devised for high-pressure experiments make it possible to obtain clean patterns without contaminant Bragg peaks from the surrounding materials. The obtained data allows us to obtain reliable structure and investigate subtle changes in liquid and glass structures. Dynamics of liquids are investigated at BL02 DNA or BL14 AMATERAS beamlines. I recently devised a new hybrid piston cylinder cell and sample container to obtain S(Q,E) spectra with high counting statistics and less multiple scattering up to 1 GPa. The high-quality data enables us to investigate liquid dynamics not only by conventional methods but also by mode distribution analysis (MDA), which reveals diffusion processes without assuming their number in advance. I will also present the first result of applying MDA to water at high pressures.