Neutron powder diffraction under high pressure using the engineering materials diffractometer "TAKUMI"

Abe, Jun; Hattori, Takanori   ; Sano, Asami   ; Arima, Hiroshi; Fukazawa, Hiroshi; Harjo, S.   ; Ito, Takayoshi; Aizawa, Kazuya  ; Utsumi, Wataru; Komatsu, Kazuki*; Arakawa, Masashi*; Kagi, Hiroyuki*; Okuchi, Takuo*

The Engineering Materials Diffractometer TAKUMI designed to solve many problems in materials science and engineering including investigations of stresses and crystallographic structures within engineering components was developed at J-PARC. In addition, TAKUMI is suitable for high-pressure experiments. High-pressure devices (Paris-Edinburgh press, palm cubic anvil press and Diamond Anvil Cell) were developed for in situ neutron powder diffraction experiments under high pressures. However, to apply a these high-pressure devices to neutron diffraction, research and development is needed. Issues to be resolved selecting materials, modifying the diffraction window and reducing BKG.