title: SENJU: a new time-of-flight single-crystal neutron diffractometer at J-PARC.
abstract: SENJU is a new single-crystal time-of-flight neutron diffractometer installed at BL18 at the Materials and Life Science Experimental Facility of the Japan Accelerator Research Complex (J-PARC). The diffractometer was designed for precise crystal and magnetic structure analyses under multiple extreme sample environments such as low temperature, high pressure and high magnetic field, and for diffraction measurements of small single crystals down to 0.1 mm3in volume. SENJU comprises three choppers, an elliptical shape straight supermirror guide, a vacuum sample chamber and 37 scintillator area detectors. The moderator-to-sample distance is 34.8 m, and the sample-to-detector distance is 800 mm. The wavelength of incident neutrons is 0.4-4.4 Å (first frame). Because short-wavelength neutrons are available and the large solid angle around the sample position is covered by the area detectors, a large reciprocal space can be simultaneously measured. Furthermore, the vacuum sample chamber and collimator have been designed to produce a very low background level. Thus, the measurement of a small single crystal is possible. As sample environment devices, a newly developed cryostat with a two-axis (ω and φ axes) goniometer and some extreme environment devices,e.g.a vertical-field magnet, high-temperature furnace and high-pressure cell, are available. The structure analysis of a sub-millimetre size (0.1 mm3) single organic crystal, taurine, and a magnetic structure analysis of the antiferromagnetic phase of MnF2have been performed. These results demonstrate that SENJU can be a powerful tool to promote materials science research.
authors.affiliation: Neutron Science Section, J-PARC Center, Japan Atomic Energy Agency , 2-4 Shirakata, Tokai, Ibaraki 319-1195, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Ohhara
authors.affiliation: Neutron Science Section, J-PARC Center, Japan Atomic Energy Agency , 2-4 Shirakata, Tokai, Ibaraki 319-1195, Japan.
authors.forename: Ryoji
authors.initials: R
authors.lastname: Kiyanagi
authors.affiliation: Neutron Science Section, J-PARC Center, Japan Atomic Energy Agency , 2-4 Shirakata, Tokai, Ibaraki 319-1195, Japan.
authors.forename: Kenichi
authors.initials: K
authors.lastname: Oikawa
authors.affiliation: Neutron Science Section, J-PARC Center, Japan Atomic Energy Agency , 2-4 Shirakata, Tokai, Ibaraki 319-1195, Japan.
authors.forename: Koji
authors.initials: K
authors.lastname: Kaneko
authors.affiliation: Neutron Science Section, J-PARC Center, Japan Atomic Energy Agency , 2-4 Shirakata, Tokai, Ibaraki 319-1195, Japan.
authors.forename: Takuro
authors.initials: T
authors.lastname: Kawasaki
authors.affiliation: Neutron Science Section, J-PARC Center, Japan Atomic Energy Agency , 2-4 Shirakata, Tokai, Ibaraki 319-1195, Japan.
authors.forename: Itaru
authors.initials: I
authors.lastname: Tamura
authors.affiliation: Research Center for Neutron Science and Technology, Comprehensive Research Organization for Science and Society , IQBRC Building, 162-1 Shirakata, Tokai, Ibaraki 319-1106, Japan.
authors.forename: Akiko
authors.initials: A
authors.lastname: Nakao
authors.affiliation: Research Center for Neutron Science and Technology, Comprehensive Research Organization for Science and Society , IQBRC Building, 162-1 Shirakata, Tokai, Ibaraki 319-1106, Japan.
authors.forename: Takayasu
authors.initials: T
authors.lastname: Hanashima
authors.affiliation: Research Center for Neutron Science and Technology, Comprehensive Research Organization for Science and Society , IQBRC Building, 162-1 Shirakata, Tokai, Ibaraki 319-1106, Japan.
authors.forename: Koji
authors.initials: K
authors.lastname: Munakata
authors.affiliation: Research Center for Neutron Science and Technology, Comprehensive Research Organization for Science and Society , IQBRC Building, 162-1 Shirakata, Tokai, Ibaraki 319-1106, Japan.
authors.forename: Taketo
authors.initials: T
authors.lastname: Moyoshi
authors.affiliation: Research Center for Neutron Science and Technology, Comprehensive Research Organization for Science and Society , IQBRC Building, 162-1 Shirakata, Tokai, Ibaraki 319-1106, Japan.
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Kuroda
authors.affiliation: Institute of Multidisciplinary Research for Advanced Materials, Tohoku University , 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Kimura
authors.affiliation: Institute of Multidisciplinary Research for Advanced Materials, Tohoku University , 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan.
authors.forename: Terutoshi
authors.initials: T
authors.lastname: Sakakura
authors.affiliation: Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan; Neutron Science Division, Korea Atomic Energy Research Institute, 111 Daedeok-Daero 989 Beon-Gil, Yuseong-Gu, Daejeon, Republic of Korea.
authors.forename: Chang-Hee
authors.initials: CH
authors.lastname: Lee
authors.affiliation: Institute of Materials Science, University of Tsukuba , 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan.
authors.forename: Miwako
authors.initials: M
authors.lastname: Takahashi
authors.affiliation: Institute of Materials Science, University of Tsukuba , 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan.
authors.forename: Ken-Ichi
authors.initials: KI
authors.lastname: Ohshima
authors.affiliation: Department of Pharmacy, Showa Pharmaceutical University , 3-3165 Higashi-Tamagawagakuen, Machida, Tokyo 194-8543, Japan.
authors.forename: Tamiko
authors.initials: T
authors.lastname: Kiyotani
authors.affiliation: Neutron Science Section, J-PARC Center, Japan Atomic Energy Agency, 2-4 Shirakata, Tokai, Ibaraki 319-1195, Japan; Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan.
authors.forename: Yukio
authors.initials: Y
authors.lastname: Noda
authors.affiliation: Neutron Science Section, J-PARC Center, Japan Atomic Energy Agency, 2-4 Shirakata, Tokai, Ibaraki 319-1195, Japan; European Spallation Source ESS AB, PO Box 176, SE-221 00, Lund, Sweden.
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Arai
keywords: MLF/J-PARC; extreme sample environments; sub-millimetre crystals; time-of-flight Laue-type single-crystal neutron diffractometer