The Performance of the J-PARC high-pressure neutron diffractometer PLANET revealed by the commissioning

Hattori, Takanori   ; Sano, Asami   ; Shioya, Masahiro; Yamada, Akihiro*; Arima, Hiroshi*; Inoue, Toru*; Inamura, Yasuhiro  ; Ito, Takayoshi*; Komatsu, Kazuki*; Kagi, Hiroyuki*; Nagai, Takaya*; Iitaka, Toshiaki*; Utsumi, Wataru; Katayama, Yoshinori; Yagi, Takehiko*

The PLANET is the world's first neutron beamline specialized for high-pressure and high-temperature experiments. The most characteristic feature is the capability to investigate the state of the matter at high-pressure and high-temperatures up to 20 GPa and 2000 K with the multi-anvil high-pressure apparatus. The construction was started in 2008, and the beamline was commissioned in the last spring. The performance revealed by the commissioning will be introduced. The resolution of the diffraction pattern (d/d = 0.6%) was found to be almost equal to the designed value (0.5%). The elimination of the background from the sample surrounding materials, which is the most important feature of the high-pressure experiments, was found to be accomplished with the use of the severe incident collimator and radial receiving collimator system. The beamline is used by project members since this autumn and will be opened for general users in the next April.