High pressure experiments using high-intensity pulsed neutron at "TAKUMI" in J-PARC

Abe, Jun; Arima, Hiroshi; Hattori, Takanori   ; Komatsu, Kazuki*; Sano, Asami   ; Arakawa, Masashi*; Okuchi, Takuo*; Kagi, Hiroyuki; Fukazawa, Hiroshi; Utsumi, Wataru

The Engineering Materials Diffractometer "TAKUMI" has been constructed in the Materials and Life Science Experimental Facility (MLF) of J-PARC. TAKUMI is the neutron powder diffractometer which intended to estimate stress in engineering components. The optical system and the sample stage of TAKUMI are well adapted to high-pressure experiments. In order to confirm the feasibility of high-pressure neutron diffraction at TAKUMI, we have performed a number of R&Ds using a Paris-Edinburgh Press and a Palm cubic anvil cell. As results, diffraction patterns coming from small samples embedded in these high-pressure devices have been obtained. In addition, in situ neutron diffraction of ice at high-pressure and low-temperature conditions ( 1 GPa, 20 K) has been performed. Recently, the further R&Ds have been done; optimization of materials such as anvil and pressure medium, developments of focusing mirror, reduction of background and contamination noise.