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Miura, Daisuke*; Kumada, Takayuki; Sekine, Yurina; Motokawa, Ryuhei; Nakagawa, Hiroshi; Oba, Yojiro; Ohara, Takashi; Takata, Shinichi; Hiroi, Kosuke; Morikawa, Toshiaki*; et al.
Journal of Applied Crystallography, 54(2), p.454 - 460, 2021/04
Times Cited Count：1 Percentile：16.63(Chemistry, Multidisciplinary)We developed a spin-contrast-variation neutron powder diffractometry technique that extracts the structure factor of hydrogen atoms, namely, the contribution of hydrogen atoms to a crystal structure factor. Crystals of L-glutamic acid were dispersed in a dpolystyrene matrix containing 4-methacryloyloxy-2,2,6,6,-tetramethyl-1-piperidinyloxy (TEMPO methacrylate) to polarize their proton spins dynamically. The intensities of the diffraction peaks of the sample changed according to the proton polarization, and the structure factor of the hydrogen atoms was extracted from the proton-polarization dependent intensities. This technique is expected to enable analyses of the structures of hydrogen-containing materials that are difficult to determine with conventional powder diffractometry.
Nakajima, Kenji; Kawakita, Yukinobu; Ito, Shinichi*; Abe, Jun*; Aizawa, Kazuya; Aoki, Hiroyuki; Endo, Hitoshi*; Fujita, Masaki*; Funakoshi, Kenichi*; Gong, W.*; et al.
Quantum Beam Science (Internet), 1(3), p.9_1 - 9_59, 2017/12
The neutron instruments suite, installed at the spallation neutron source of the Materials and Life Science Experimental Facility (MLF) at the Japan Proton Accelerator Research Complex (J-PARC), is reviewed. MLF has 23 neutron beam ports and 21 instruments are in operation for user programs or are under commissioning. A unique and challenging instrumental suite in MLF has been realized via combination of a high-performance neutron source, optimized for neutron scattering, and unique instruments using cutting-edge technologies. All instruments are/will serve in world-leading investigations in a broad range of fields, from fundamental physics to industrial applications. In this review, overviews, characteristic features, and typical applications of the individual instruments are mentioned.
Oguri, Hidetomo; Hasegawa, Kazuo; Ito, Takashi; Chishiro, Etsuji; Hirano, Koichiro; Morishita, Takatoshi; Shinozaki, Shinichi; Ao, Hiroyuki; Okoshi, Kiyonori; Kondo, Yasuhiro; et al.
Proceedings of 11th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.389 - 393, 2014/10
no abstracts in English
Takeda, Masayasu; Yamazaki, Dai; Soyama, Kazuhiko; Maruyama, Ryuji; Hayashida, Hirotoshi; Asaoka, Hidehito; Yamazaki, Tatsuya; Kubota, Masato; Aizawa, Kazuya; Arai, Masatoshi; et al.
Chinese Journal of Physics, 50(2), p.161 - 170, 2012/04
Kobayashi, Takayuki; Terakado, Masayuki; Sato, Fumiaki; Yokokura, Kenji; Shimono, Mitsugu; Hasegawa, Koichi; Sawahata, Masayuki; Suzuki, Sadaaki; Hiranai, Shinichi; Igarashi, Koichi; et al.
Plasma and Fusion Research (Internet), 4, p.037_1 - 037_10, 2009/08
Electron cyclotron (EC) heating and current drive (CD) are key tools to control fusion plasma especially for effective electron heating and for suppression of neoclassical tearing mode (NTM). Recently, developments of a high power gyrotron and a power modulation technique have been successfully achieved on JT-60U ECRF system in order to enhance the system performance. Stable gyrotron oscillation with oscillation power of 1.5 MW for 1 s was demonstrated in 2007, for the first time. Then temperature rise of cavity and collector has been investigated. It has been shown that the longer pulse operation with 1.5 MW by an improved 110 GHz gyrotron is possible. In addition, modulated ECCD in synchronized with NTM rotation has been performed with the oscillation power of 0.8 MW and the frequency around 5 kHz. The synchronizing system has worked very well and it has played an essential role in NTM suppression experiments on JT-60U.
Moriyama, Shinichi; Kobayashi, Takayuki; Isayama, Akihiko; Terakado, Masayuki; Sawahata, Masayuki; Suzuki, Sadaaki; Yokokura, Kenji; Shimono, Mitsugu; Hasegawa, Koichi; Hiranai, Shinichi; et al.
Nuclear Fusion, 49(8), p.085001_1 - 085001_7, 2009/07
Times Cited Count：21 Percentile：61.43(Physics, Fluids & Plasmas)In the gyrotron development in JT-60U ECRF system, output power of 1.5 MW for 1 s has been achieved at 110 GHz. It is the world highest power oscillation 
1 s. In addition to the carefully designed cavity and collector in view of thermal stress, an RF shield for the adjustment bellows, and a low-dielectric-loss DC break enabled this achievement. Power modulation technique by anode voltage control was improved to obtain high modulation frequency and 5 kHz has been achieved for NTM stabilizing experiments. Long pulse demonstration of 0.4 MW, 30 s injection to the plasma has been achieved with real time control of anode/cathode-heater. It has been confirmed that the temperature of cooled components were saturated and no evidence of damage were found. An innovative antenna having wide range of beam steering capability with linearly-moving-mirror concept has been designed for long pulse. Beam profile and mechanical strength analyses shows the feasibility of the antenna.
Yokokura, Kenji; Shimono, Mitsugu; Hasegawa, Koichi; Sawahata, Masayuki; Suzuki, Sadaaki; Terakado, Masayuki; Hiranai, Shinichi; Igarashi, Koichi; Sato, Fumiaki; Wada, Kenji; et al.
JAEA-Technology 2008-065, 98 Pages, 2008/10
JAEA-Technology-2008-065.pdf:38.83MB
Construction of the JT-60SA (super advanced) is planned as an upgrade of JT-60U as the satellite tokamak in ITER broader approach and as the national centralized tokamak facility program in Japan. The present JT-60U will be disassembled and the JT-60SA will be constructed at the same location in the JT-60 tours hall. The disassembly work will be planned in the period from 2009 to 2011. In this report, disassembly of the radio frequency heating system of JT-60U in the amplifier rooms and heating power supply building is studied on (1) object for disassembly, (2) work plan, (3) estimation of materials amount, (4) procedure.
Moriyama, Shinichi; Kobayashi, Takayuki; Isayama, Akihiko; Terakado, Masayuki; Sawahata, Masayuki; Suzuki, Sadaaki; Yokokura, Kenji; Shimono, Mitsugu; Hasegawa, Koichi; Hiranai, Shinichi; et al.
Proceedings of 22nd IAEA Fusion Energy Conference (FEC 2008) (CD-ROM), 8 Pages, 2008/10
In the gyrotron development in JT-60U ECRF system, output power of 1.5 MW for 1 s has been achieved at 110 GHz. It is the world highest power oscillation 1 s. In addition to the carefully designed cavity and collector in view of thermal stress, an RF shield for the adjustment bellows, and a low-dielectric-loss DC break enabled this achievement. Power modulation technique by anode voltage control was improved to obtain high modulation frequency and 5 kHz has been achieved for NTM stabilizing experiments. Long pulse demonstration of 0.4 MW, 30 s injection to the plasma has been achieved with real time control of anode/cathode-heater. It has been confirmed that the temperature of cooled components were saturated and no evidence of damage were found. An innovative antenna having wide range of beam steering capability with linearly-moving-mirror concept has been designed for long pulse. Beam profile and mechanical strength analyses shows the feasibility of the antenna.
Saito, Kimiaki; Kinase, Sakae; Suzuki, Toshikazu*; Nakano, Takashi*; Sato, Yuichi*; Ishigure, Nobuhito*; Iwai, Satoshi*
Hoken Butsuri, 42(1), p.38 - 52, 2007/03
The expert committee on development and utilization of phantoms had activities from April, 2004 to March, 2006 sponsored by the Japan Health Physics Society. The purpose of the committee was to accumulate and share the latest information concerning phantoms and related technical issues, and to discuss how and for what phantoms should be utilized in future. The committee had twelve meetings and one symposium. Many people took part in the activity including the committee members, observers and other participants; we had a certain number of lectures covering versatile topics and chances to discuss essential problems including sophistication and standardization of phantoms. Some parts of the information we obtained in this activity have been presented in the articles in series.
observed by neutron diffraction measurementsArai, Shigeki; Chatake, Toshiyuki*; Ohara, Takashi; Kurihara, Kazuo; Tanaka, Ichiro*; Suzuki, Nobuhiro*; Fujimoto, Zui*; Mizuno, Hiroshi*; Niimura, Nobuo
Nucleic Acids Research, 33(9), p.3017 - 3024, 2005/05
Times Cited Count：93 Percentile：82.84(Biochemistry & Molecular Biology)It has long been suspected that the structure and function of a DNA duplex can be strongly dependent on its degree of hydration. By neutron diffraction experiments, we have succeeded in determining most of the hydrogen (H) and deuterium (D) atomic positions in the d(CCATTAATGG) duplex. Moreover, the D positions in 27 DO molecules have been determined. In particular, the complex water network in the minor groove has been observed in detail. By a combined structural analysis using 2.0 Å resolution X-ray and 3.0 Å resolution neutron data, it is clear that the spine of hydration is built up, not only by a simple hexagonal hydration pattern (as reported in prior X-ray studies), but also by many other water bridges hydrogen-bonded to the DNA strands. The complexity of the hydration pattern in the minor groove is derived from an extraordinary variety of orientations displayed by the water molecules.
Onizawa, Takashi; ; ; ;
JNC TN9450 2001-005, 245 Pages, 2001/08
JNC-TN9450-2001-005.pdf:5.11MB
FBR structural materials tests have been preformed in New Technology Development Group. Many valuable relaxation data in this report will be used for material examination of FBR in the future. Contents of the data sheet are as follows; (1)Material: SUS304, SUS316, SUS321, 316FR, 2.25Cr-1Mo Steel, Mod.9Cr-1Mo Steel, 9Cr-2Mo Steel, INCONEL718 (2)Test environment: In air (3)Test temperature: 400
C to 650C (4)Test method: According to JIS and FBR Metallic Materials Test Method (5)Number of data: Total 343. These data are the printouts of "the structural material data processing system, SMAT".
; Shingu, Kazuki*; Takahashi, Eiichiro*; Nakajima, Toshihide*; Yamashita, Mitsugu*; ;
PNC TJ7187 97-002, 586 Pages, 1997/11
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Ohara, Takashi; Kurihara, Kazuo; Kusaka, Katsuhiro*; Hosoya, Takaaki*; Tanaka, Ichiro*; Niimura, Nobuo*; Otomo, Toshiya*; Suzuki, Jiro*; Nakatani, Takeshi
no journal, ,
no abstracts in English
Takeda, Masayasu; Yamazaki, Dai; Maruyama, Ryuji; Hayashida, Hirotoshi; Soyama, Kazuhiko; Yamazaki, Tatsuya; Hirano, Tatsumi*; Oikawa, Kenichi; Tamura, Itaru; Sakasai, Kaoru; et al.
no journal, ,
no abstracts in English
Terakado, Masayuki; Kobayashi, Takayuki; Sato, Fumiaki; Sawahata, Masayuki; Suzuki, Sadaaki; Shimono, Mitsugu; Hiranai, Shinichi; Igarashi, Koichi; Suzuki, Takashi; Wada, Kenji; et al.
no journal, ,
no abstracts in English
Yokokura, Kenji; Moriyama, Shinichi; Kobayashi, Takayuki; Hasegawa, Koichi; Suzuki, Sadaaki; Hiranai, Shinichi; Sato, Fumiaki; Suzuki, Takashi; Fujii, Tsuneyuki
no journal, ,
no abstracts in English
Takeda, Masayasu; Yamazaki, Dai; Soyama, Kazuhiko; Maruyama, Ryuji; Hayashida, Hirotoshi; Asaoka, Hidehito; Yamazaki, Tatsuya; Kubota, Masato; Aizawa, Kazuya; Arai, Masatoshi; et al.
no journal, ,
Nakatani, Takeshi; Inamura, Yasuhiro; Ito, Takayoshi; Ohara, Takashi; Kawakita, Yukinobu; Otomo, Toshiya*; Suzuki, Jiro*; Muto, Suguru*; Kojima, Kenji*; Clarke, M.*
no journal, ,
In this year, we are developing the following three items in the software framework "IROHA" which is the standard software for J-PARC/MLF computing environment. First, the experimental metadata are managed by the MLF database, which is available for the multi-dimensional data analysis environment. Second, the automatic experimental software is called "Experiment Scheduler", which is collaborated with ISIS. And third, the digital and analog signals are acquired as general event with "TRIGNET" which is the event recording system for the variation of the external fields. We present the detail of these items and the remote data analysis environment which we will introduce next year.
Kobayashi, Takayuki; Moriyama, Shinichi; Yokokura, Kenji; Hasegawa, Koichi; Suzuki, Sadaaki; Hiranai, Shinichi; Sato, Fumiaki; Suzuki, Takashi; Fujii, Tsuneyuki
no journal, ,
no abstracts in English
Sato, Fumiaki; Suzuki, Sadaaki; Hasegawa, Koichi; Yokokura, Kenji; Hiranai, Shinichi; Suzuki, Takashi; Kobayashi, Takayuki; Seki, Masami; Moriyama, Shinichi; Fujii, Tsuneyuki
no journal, ,
no abstracts in English
