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Hattori, Takanori; Arima, Hiroshi; Sano, Asami; Utsumi, Wataru; Nagai, Takaya*; Iitaka, Toshiaki*; Kagi, Hiroyuki*; Katayama, Yoshinori; Inoue, Toru*; Yagi, Takehiko*
no journal, ,
The PLANET is the new high-pressure neutron beamline now being constructed at the intense pulsed neutron source J-PARC. This beamline aims at revealing the effect of water on dynamics of the interior of the Earth and planets by using the neutron character that is sensitive to hydrogen. The most characteristic feature of this beamline is to posses the huge 6-axis press with the maximum load of 500 ton/axis, which can simultaneously generate high-pressure and high-temperature condition of 30GPa and 2000 K. Coupled with the state-of-the-art techniques in neutron diffraction and radiography, the beamline offers the microscopic and macroscopic information of materials at high-PT condition. We stared designing at 2008 and already installed all the beamline components except those scheduled to be installed inside the experimental hutch. The huge press and detector banks have been constructed and are waiting to be installed. The installation will be finished in 2011, and the commissioning will starts at 2012.
Oikawa, Kenichi; Ohara, Takashi*; Kiyanagi, Ryoji; Kawasaki, Takuro; Tamura, Itaru; Kaneko, Koji; Nakamura, Tatsuya; Sakasai, Kaoru; Nakao, Akiko*; Hanashima, Takayasu*; et al.
no journal, ,
SENJU, named after the thousand armed Goddess of Mercy, is a single crystal time-of-flight Laue diffractometer proposed to the MLF at J-PARC. The diffractometer is dedicated for precise crystal and magnetic structure analyses under the combined extreme conditions using a small sample less than 1 
. TOF-Laue technique coupled with wide area 2D detectors enables the efficient measurements and improves the completeness of the data. A WLSF-type scintillator detector developed for iBIX was modified to meet the requirements of SENJU. Although the construction schedule has been delayed because of the earthquake, on-beam commissioning will start in 2012.
Matsubayashi, Masahito; Yasuda, Ryo; Iikura, Hiroshi; Nojima, Takehiro; Sakai, Takuro
no journal, ,
no abstracts in English
Tamura, Itaru; Arai, Masaji; Murayama, Yoji
no journal, ,
Yasuda, Ryo; Sakai, Takuro; Harada, Masahide; Matsubayashi, Masahito
no journal, ,
no abstracts in English
Yasuda, Ryo; Nojima, Takehiro; Iikura, Hiroshi; Sakai, Takuro; Matsubayashi, Masahito
no journal, ,
no abstracts in English
Harada, Masahide; Parker, J.*; Sawano, Tatsuya*; Kubo, Hidetoshi*; Tanimori, Toru*; Shinohara, Takenao; Maekawa, Fujio
no journal, ,
Harada, Masahide; Oikawa, Kenichi; Maekawa, Fujio; Meigo, Shinichiro; Futakawa, Masatoshi
no journal, ,
Maruyama, Ryuji; Yamazaki, Dai; Hayashida, Hirotoshi; Soyama, Kazuhiko
no journal, ,
We have developed neutron polarizing and non-polarizing supermirrors by using the ion beam sputtering (IBS) technique for the J-PARC/NLF. The performance of the supermirrors fabricated in the JAEA and the recent studies of the multilayer consisting of a supermirror to realize a supermirror with a higher performance are presented.
-BaTiO3 system studied by neutron and X-ray powder diffractionKiyanagi, Ryoji; Yamazaki, Tadashi*; Sakamoto, Yuma*; Kimura, Hiroyuki*; Noda, Yukio*; Oyama, Kenji*; Torii, Shuki*; Yonemura, Masao*; Zhang, J.*; Kamiyama, Takashi
no journal, ,
Endo, Hitoshi; Takano, Atsushi*
no journal, ,
To study dynamics of polymers on the molecular level, it is necessary to perform experiments in the wide spatiotemporal scale. Neutron spin echo (NSE) technique allows us to access the time scale from sub-nanosecond to sub-microsecond with the length scale from sub-nanometer to sub-micrometer with relatively little efforts. Another important feature of the neutron scattering is deuterium labeling, i.e., with neutrons as probe, contrast variation techniques based on hydrogen/deuterium replacement can be used to modify the visibility of different component in the system. In this study, the dynamic structure factors of a linear random block copolymer with deuterated and protonated monomers were measured by NSE quantitatively, and were compared with those of the fully protonated polymer with the same polymerization degree. The observed dynamic structure factors have confirmed the high measurement accuracy of the NSE spectrometer in Japan.
Sano, Asami; Kuribayashi, Takahiro*; Komatsu, Kazuki*; Yagi, Takehiko*; Otani, Eiji*
no journal, ,
Wadsleyite is a main constituent of upper part of the mantle transition zone, at 410 - 520 km depth of the earth. Since the Smyth's prediction, wadsleyite, which is one of the nominally anhydrous mineral (NAMs) have been attracted as a host of water in the mantle. Subsequent studies have also revealed that a small amount of hydrogen cause changes of some physical properties of wadsleyite dramatically. To understand the effect of hydration of wadsleyite on its physical properties, it is essential to know the position of hydrogen in the structure. In this study, we intend to determine the hydrogen position of wadsleyite by neutron powder diffraction experiment. Full Rietveld refinement with deuterium was successfully conducted, which revealed that an O-D bond is formed at the edge of the M3 octahedron between the O1...O4 (3.074 A).
Aoki, Katsutoshi; Machida, Akihiko; Honda, Mitsunori; Hattori, Takanori; Sano, Asami; Watanuki, Tetsu; Katayama, Yoshinori; Komatsu, Kazuki*; Arima, Hiroshi; Otomo, Toshiya*; et al.
no journal, ,
Rare-earth metal La forms T-site occupied fcc-LaH
and fully occupied fcc-LaH, the former is metallic and the latter is insulating. Our previous synchrotron X-ray and infrared measurements revealed that the dihydride decomposed into hydrogen-rich and hydrogen-poor phases upon compression to 11 GPa at ambient temperature; the hydrogen rich phase was identified as LaH but the hydrogen composition and occupation sites of the hydrogen-poor phase remained undetermined. The crystal structure of the hydrogen-poor phase was investigated for LaD by neutron diffraction measurement with a total diffractometer NOVA at J-PARC. The formation of NaCl-type LaD as a counterpart of LaD by the decomposition was confirmed from the diffraction profiles. First-principle enthalpy and lattice dynamic calculations have demonstrated that the NaCl-type LaH is stabilized at high pressures.
Tominaga, Taiki; Suzuki, Junichi*; Takata, Shinichi; Shinohara, Takenao; Oku, Takayuki; Nakatani, Takeshi; Inamura, Yasuhiro; Suzuya, Kentaro; Aizawa, Kazuya; Arai, Masatoshi; et al.
no journal, ,
no abstracts in English
Harjo, S.; Ito, Takayoshi*; Gong, W.; Suzuki, Hiroshi; Arima, Hiroshi*; Abe, Jun; Aizawa, Kazuya
no journal, ,
Sakai, Kenji; Oi, Motoki; Kai, Tetsuya; Watanabe, Akihiko; Sakamoto, Shinichi; Futakawa, Masatoshi
no journal, ,
A general control system of MLF consists of subsystems of integral control system, personnel protection system, server system, and so on. Its design and construction have progressed for the first proton beam injection. After finishing its construction, commissioning on operation and control of the whole MLF has started in 2007. During a short period before the first beam injection, trial operations, performance tests, and improvements of the MLF-GCS subsystems have been executed under restricted conditions. After the first beam injection in May 2008, the subsystems have been improved according to experience on the beam operations, and stable and efficient operations of the MLF-GCS have been realized. However, upgrade of the MLF-GCS is in progress now based on improvement of the target station for increment of the proton beam power, and increment of number of user apparatuses. This paper reports on the outline, commissioning, operation and upgrade of the MLF-GCS.
Ishii, Kenji; Tsutsui, Kenji; Ikeuchi, Kazuhiko*; Jarrige, I.; Mizuki, Junichiro; Hiraka, Haruhiro*; Yamada, Kazuyoshi*; Toyama, Takami*; Maekawa, Sadamichi; Ishii, Hirofumi*; et al.
no journal, ,
Kikuchi, Tatsuya; Nakajima, Kenji; Kawamura, Seiko; Inamura, Yasuhiro; Yamamuro, Osamu*; Kofu, Maiko*
no journal, ,
In generally so far, analysis of quasi-elastic neutron scattering spectra needs some mathematical models in its process, and hence the obtained result is a model dependent. Model-dependent analysis may lead misunderstandings caused by inappropriate initial models or may miss the unexpected phenomenon. Therefore, the alternative approach of analysis without any specific model is desired. In this context, we are trying to develop new method, which does not require any specific initial models. In this new approach, we can obtain new quantity, 
by using maximum entropy method (MEM). Our new approach was applied on liquid water. Obtained shows diffusion process in this system consist of three components: a slow motion, a fast motion and an intermediate motion between two. As it has been thought, the slow component is a translational motion and the fast component is a rotational motion. In contrast, the intermediate motion is discovered for the first time.
Futakawa, Masatoshi; Wanner, M.*; Haines, J.*
no journal, ,
Present status of high power spallation targets is introduced: SINQ facility at Paul Scherrer Institute, SNS facility at Oak Ridge National Laboratory, JSNS/J-PARC.
Nakatani, Takeshi; Inamura, Yasuhiro; Otomo, Toshiya*; Moriyama, Kentaro
no journal, ,
The neutron experimental instruments in J-PARC/MLF are equipped with the large area detector system which has thousands of pixels and many sample environment devices. The samples brought by the users (about ten thousand per year) are probed by the neutrons from high intensity pulsed source with the sample environment devices kept in the instruments as well as their own. These measurements produce them a large number of huge data with changing the measurement conditions in short time. And then, these data are repeatedly analyzed in multidimensional conditions at on-site or users' home laboratories. To meet this demand, we need the flexible data management system handling many users and many data. In this presentation, we will show the design and prototype of the database, especially the remote access from outside and the data backup from the instrument storages.