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Kurihara, Kazuo; Tomoyori, Katsuaki; Tamada, Taro
no journal, ,
Many of membrane proteins and protein complexes have larger molecular weight and then unit cells of their crystals have larger volume. Therefore, our group had designed the diffractometer which is able to cover such a crystal with large unit cell volume (target lattice length: 250 
). This proposal was accepted by Neutron Instrument Program Review Committee of J-PARC in September 2012. Larger unit cell volume causes a problem to separate spots closer to each other in spatial and time distribution in diffraction images. Therefore, our proposed diffractometer adopted longer camera distance (800 mm) and decoupled moderator as neutron source which has shorter pulse width. The neutron guide tube was designed to use limited surface of the decoupled moderator with high luminescence (40 mm high 
60 mm wide) whose luminosity is about 1.3 times as high as that of average of the whole surface in the wavelength range from 2.9 to 9.1 . Ellipsoidal and curved shape were introduced in the vertical and the horizontal design of the guide design, respectively, which provide maximum beam divergence of 0.8
in vertical and 0.6 in horizontal, respectively, at the sample position. According to ray-tracing simulation by McStas code, neutron flux at the sample position is estimated to be 510
/cm
/s in the wavelength range of 1.5 - 5.6 (first frame).
Oikawa, Kenichi; Harada, Masahide; Nakajima, Kenji; Kawakita, Yukinobu; Aizawa, Kazuya; Soyama, Kazuhiko
no journal, ,
NOBORU at MLF/J-PARC was constructed at BL10 in 2007 by neutron source section. The instrument have two objects; (1) design validation of Japan Spallation Neutron Source, and (2) research and develop the new equipments and techniques for high-intensity pulsed neutrons. In 2015, we are discussing to move function of NOBORU to another beam-line because of the new proposed instrument at BL10. We will propose the design study of NOBORU-II as a test port for the innovative instruments in next decade.
Kai, Tetsuya; Shinohara, Takenao; Oikawa, Kenichi; Nakatani, Takeshi; Segawa, Mariko; Hiroi, Kosuke; Su, Y. H.; Hayashida, Hirotoshi*; Parker, J. D.*; Matsumoto, Yoshihiro*; et al.
no journal, ,
no abstracts in English
Onuki, Yusuke*; Hoshikawa, Akinori*; Yoshida, Yukihiko*; Matsukawa, Ken*; Ishigaki, Toru*; Xu, P. G.
no journal, ,
no abstracts in English
Su, Y. H.; Oikawa, Kenichi; Harjo, S.; Shinohara, Takenao; Kai, Tetsuya; Harada, Masahide; Hiroi, Kosuke; Zhang, S.*; Parker, J. D.*; Sato, Hirotaka*; et al.
no journal, ,
Nakagawa, Hiroshi; Shibata, Kaoru; Yamada, Takeshi*
no journal, ,
Dynamics of protein and the water in the molecular crowding environment was observed in a DNA instrument of J-PARC/MLF. Using glycerol which was a small molecule crowding agent, the molecular crowding effect on molecular diffusion and structure fluctuation of the protein was examined. As a result of analysis, two quasi-elastic scatterings were separated derived from global diffusion and internal motion of protein. And it was found that the glycerol concentration-dependent global diffusion was correlated with the viscosity of the solvent. In addition, EISF from the internal motion was high in glycerol density, and it was suggested that protein internal motion was restricted by glycerol.
Takeda, Masayasu; Suzuki, Junichi*
no journal, ,
no abstracts in English
Shimojo, Yutaka; Suzuki, Hiroshi; Nagahori, Kazuhisa; Sasajima, Fumio
no journal, ,
no abstracts in English
Watanabe, Masao; Nojiri, Hiroyuki*
no journal, ,
Recently, neutron scattering experiments have been rapidly progressed under high magnetic field. In the J-PARC, proto-type compact pulse magnet system with high magnetic field has been developed. Magnetic field in the coil is more than 20 Tesla and pulse width is more than a few mili second in the system. Basic specifications of this system are as follows. Maximum charged voltage with capacitor is 2 kV. Maximum current in the coil is 7 kA. Repetition rate is a pulse per severa minuets. Pulse duration is several msec. In this presentation, the details of the power supply system, sample stick are shown.
Mizusawa, Mari*; Sakurai, Kenji*; Yamazaki, Dai; Takeda, Masayasu
no journal, ,
no abstracts in English
Yamauchi, Hiroki; Watanuki, Ryuta*; Chi, S.*; Fernandez-Baca, J. A.*; Kaneko, Koji; Kawasaki, Takuro; Kiyanagi, Ryoji; Hanashima, Takayasu*
no journal, ,
no abstracts in English
by atomic pair distribution functionKodama, Katsuaki; Shamoto, Shinichi; Ikeda, Kazutaka*; Otomo, Toshiya*; Takeda, Hikaru*; Isobe, Masahiko*; Ito, Masayuki*; Ueda, Yutaka*
no journal, ,
no abstracts in English
Matsuo, Tatsuhito; Arata, Toshiaki*; Oda, Toshiro*; Fujiwara, Satoru
no journal, ,
We studied the dynamics of F-actin, myosin S1 (S1), and their hydration water using quasi elastic neutron scattering (QENS). The analysis of the QENS spectra shows that the residence time of the atoms of F-actin is shorter than that of S1, and that the fraction of the "immobile" atoms is smaller for F-actin. These results suggest that more atoms fluctuate more rapidly in F-actin. The analysis of the spectra of their hydration water shows that the translational diffusion coefficient is smaller for S1 than F-actin. Whereas the residence time is similar between F-actin and S1 within the experimental errors, the rotational correlation time is smaller for F-actin. Furthermore, the translational diffusion coefficient and the rotational correlation time of the hydration water of F-actin are close to those of bulk water. These results imply that the concerted action between F-actin and its hydration water with high mobility allows F-actin to take quickly suitable conformations for S1 binding.
Fujiwara, Satoru; Matsuo, Tatsuhito; Yamada, Takeshi*; Shibata, Kaoru
no journal, ,
no abstracts in English
Inamura, Yasuhiro; Nakatani, Takeshi; Ito, Takayoshi*; Suzuki, Jiro*
no journal, ,
"Utsusemi" is the data reduction software for neutron scattering at MLF in J-PARC. The development of Utsusemi started from the software development for the chopper-type neutron inelastic measurement, which includes the device control system, data analysis and visualization. These development products were successfully utilized in actual users measurements for chopper spectrometers, while we were proceeding with developments intensively for the analysis to use effectively the event-recording data outputted from DAQ system utilized as MLF common system. By the request by the other beam lines, we separated the analysis and visualization parts from original Utsusemi to provide them as common software in MLF. In these years, not only the inelastic instruments but also many of other instruments in MLF begin to introduce this new Utsusemi to achieve more flexible analysis using event-recording method.
Hiroi, Kosuke; Shinohara, Takenao; Hayashida, Hirotoshi*; Parker, J. D.*; Oikawa, Kenichi; Harada, Masahide; Kai, Tetsuya; Su, Y. H.
no journal, ,
We have been developing an imaging technique using polarized pulsed neutron for quantitative evaluation of magnetic field in industrial equipment, e.g. an electric motor and an electric transformer, etc. In this study, we attempt to evaluate direction of a field in the gap between the rotor and the stator of a model electric motor. Magnetic imaging experiment was performed at BL10 "NOBORU" in Materials and Life science experimental Facility (MLF) of J-PARC. In this experiment, we changed the quantized axis of a neutron spin using spin-rotators and obtained polarization images with various neutron spin directions. By analyzing change in polarization depending on neutron spin direction, we successfully obtained field-direction distribution image in the model motor.
Li, B.; Feygenson, M.*; Ohara, Koji*; Zhang, Q.*; Vaknin, D.*; Yamada, Takeshi*; Miao, P.*; Kamiyama, Takashi*; Kawakita, Yukinobu
no journal, ,
Sakai, Kenji; Oi, Motoki; Watanabe, Akihiko; Kato, Yuko; Meigo, Shinichiro; Takada, Hiroshi
no journal, ,
no abstracts in English
by powder inelastic neutron scatteringKajimoto, Ryoichi; Nakamura, Mitsutaka; Kikuchi, Tatsuya; Hata, Hiroto*; Eto, Takahiro*; Sobaru, Shogo*; Okuda, Tetsuji*
no journal, ,
no abstracts in English