SENJU, extreme environment single crystal neutron diffractometer at J-PARC

Ohara, Takashi   ; Kiyanagi, Ryoji  ; Kaneko, Koji   ; Kawasaki, Takuro   ; Oikawa, Kenichi   ; Tamura, Itaru  ; Nakao, Akiko*; Hanashima, Takayasu*; Munakata, Koji*; Moyoshi, Taketo*

SENJU, a TOF-Laue single crystal neutron diffractometer at the BL18 of MLF/J-PARC, was designed for precise crystal and magnetic structure analyses under multiple extreme environments such as low-temperature, high-pressure and high-magnetic field, and also capable of taking diffraction measurements of small single crystals, less than 1.0 mm in volume. Just after the launch of SENJU in March 2012, we newly installed and/or upgraded some sample environment devices. The most popular sample environment device on SENJU is the 4 K cryostat with a fixed-chi type 2-axes goniometer. We adopted piezo-rotators to rotate the sample crystal under vacuumed and cryo conditions. A longitudinal magnet was recently installed on SENJU. The lowest temperature was 1.42 K and the maximum magnetic field was 6.85 T. In this presentation, we will show the current status of sample environment devices for SENJU such as cryostat, magnet and other devices.