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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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Yokokura, Kenji; Moriyama, Shinichi; Kobayashi, Takayuki; Hasegawa, Koichi; Suzuki, Sadaaki; Hiranai, Shinichi; Sato, Fumiaki; Suzuki, Takashi; Fujii, Tsuneyuki
no journal, ,
no abstracts in English
Kobayashi, Takayuki; Moriyama, Shinichi; Yokokura, Kenji; Hasegawa, Koichi; Suzuki, Sadaaki; Hiranai, Shinichi; Sato, Fumiaki; Suzuki, Takashi; Wada, Kenji; Fujii, Tsuneyuki
no journal, ,
Developments of reliable transmission lines and antennas are important to high power and long pulse operations of electron cyclotron resonance heating (ECH) systems. Design study of an antenna concept, which has a reliable cooling and driving structure to alter wave injection angle in poloidal direction only by a linear motion of a mirror, is under way. For an effective current drive and an electron heating by ECH, a toroidal injection angle (
) should be optimized for each objective of the experiment. In this study, an available range of was evaluated. Due to a difference of the reflecting position on the movable mirror toward depth of a port for each 
, the available is limited for small . By a numerical calculation, it was found that 0 
20 was available for = 0 by this antenna assuming the JT-60U ECH port. Therefore toroidal injection angle can be optimized for each experiment.
Ohara, Takashi; Kusaka, Katsuhiro*; Hosoya, Takaaki; Kurihara, Kazuo; Tomoyori, Katsuaki*; Niimura, Nobuo*; Tanaka, Ichiro*; Suzuki, Jiro*; Nakatani, Takeshi; Otomo, Toshiya*; et al.
no journal, ,
For a single crystal diffractometer, a data reduction software which extracts a HKLF list from the raw data is one of the most important components. We are now developing a new data reduction software for a new single crystal neutron diffractometer, "IBARAKI Biological Crystal Diffractometer (iBIX)", which is now constructing at the MLF of J-PARC.
Suzuki, Jiro*; Kajimoto, Ryoichi; Ohara, Takashi; Yonemura, Masao*; Aoyagi, Tetsuo; Manabe, Atsushi*; Nakatani, Takeshi; Otomo, Toshiya*; Kawabata, Setsuya*
no journal, ,
Manyo-Lib is a framework of software designed for data analysis for neutron scattering experiment. It is one of the fundamental software used in J-PARC/MLF. Manyo-Lib consists of class libraries of C++ and Python interfaces that wrap the class libraries. The purpose of Manyo-lib is to offer operators for analysis, data containers, distributed computing environment, common data formats necessary to analyzing experiment data generated by various scattering equipments and various research regions. We are going to use NeXus as our common file format.
Kobayashi, Takayuki; Moriyama, Shinichi; Yokokura, Kenji; Shimono, Mitsugu; Hasegawa, Koichi; Sawahata, Masayuki; Suzuki, Sadaaki; Terakado, Masayuki; Hiranai, Shinichi; Igarashi, Koichi; et al.
no journal, ,
In JT-60SA, 7 MW of electron cyclotron heating and current drive will be performed with four units of 110 GHz and five units of 140 GHz electron cyclotron range of frequency (ECRF) systems. Transmission lines will be connected into four upper outer ports where quasi-optical antennas will be installed. Two types of antenna systems are being considered. One is a conventional type rotation antenna and the other is a new concept antenna which can control incident angle by a linearly driven mirror. Those antennas are now being evaluated from the view points of cooling structure, the range of incident angle and beam width. In addition, 1.5 MW for 1 s oscillation was carried out by one gyrotron of JT-60U ECRF system. Moreover, the present 110 GHz gyrotron will be improved which aims at the development of JT-60SA gyrotron. In this presentation, current status of design study for JT-60SA ECRF system and the latest results of the JT-60U ECRF system will be presented.
Suzuki, Sadaaki; Sato, Fumiaki; Hiranai, Shinichi; Suzuki, Takashi; Terakado, Masayuki; Kobayashi, Takayuki; Isayama, Akihiko; Moriyama, Shinichi
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
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
