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Journal Articles

Electron heat diffusivity in radially-bounded ergodic region of toroidal plasma

Kanno, Ryutaro*; Nunami, Masanori*; Satake, Shinsuke*; Matsuoka, Seikichi; Takamaru, Hisanori*

Nuclear Fusion, 58(1), p.016033_1 - 016033_7, 2018/01

 Times Cited Count:0 Percentile:0.01(Physics, Fluids & Plasmas)

The electron heat transport in a torus plasma which involves a radially-bounded ergodic region, where flux surfaces are partially destroyed by perturbative magnetic fields, is studied. In this paper, we have demonstrated that the radial heat conduction by the particles' parallel motion is reduced by trapped particles.

Journal Articles

Development of a drift-kinetic simulation code for estimating collisional transport affected by RMPs and radial electric field

Kanno, Ryutaro*; Nunami, Masanori*; Satake, Shinsuke*; Matsuoka, Seikichi; Takamaru, Hisanori*

Contributions to Plasma Physics, 56(6-8), p.592 - 597, 2016/08

 Times Cited Count:2 Percentile:15.21(Physics, Fluids & Plasmas)

A drift-kinetic $$delta f$$ simulation code is developed for estimating collisional transport in quasi-steady state of toroidal plasma affected by resonant magnetic perturbations and radial electric field. In this paper, validity of the code is confirmed through several test calculations. It is found that radial electron flux is reduced by positive radial-electric field, although radial diffusion of electron is strongly affected by chaotic field-lines under an assumption of zero electric field.

Journal Articles

Progress report of Japanese simulation research projects using the high-performance computer system Helios in the International Fusion Energy Research Centre

Ishizawa, Akihiro*; Idomura, Yasuhiro; Imadera, Kenji*; Kasuya, Naohiro*; Kanno, Ryutaro*; Satake, Shinsuke*; Tatsuno, Tomoya*; Nakata, Motoki*; Nunami, Masanori*; Maeyama, Shinya*; et al.

Purazuma, Kaku Yugo Gakkai-Shi, 92(3), p.157 - 210, 2016/03

The high-performance computer system Helios which is located at The Computational Simulation Centre (CSC) in The International Fusion Energy Research Centre (IFERC) started its operation in January 2012 under the Broader Approach (BA) agreement between Japan and the EU. The Helios system has been used for magnetised fusion related simulation studies in the EU and Japan and has kept high average usage rate. As a result, the Helios system has contributed to many research products in a wide range of research areas from core plasma physics to reactor material and reactor engineering. This project review gives a short catalogue of domestic simulation research projects. First, we outline the IFERC-CSC project. After that, shown are objectives of the research projects, numerical schemes used in simulation codes, obtained results and necessary computations in future.

Journal Articles

Turbulence spectra, transport, and $$E$$$$times$$$$B$$ flows in helical plasmas

Watanabe, Tomohiko*; Nunami, Masanori*; Sugama, Hideo*; Satake, Shinsuke*; Matsuoka, Seikichi*; Ishizawa, Akihiro*; Maeyama, Shinya; Tanaka, Kenji*

Proceedings of 24th IAEA Fusion Energy Conference (FEC 2012) (CD-ROM), 8 Pages, 2012/10

Journal Articles

Resonant X-ray diffraction study of multipole ordering in the ferromagnetic compound CePd$$_3$$S$$_4$$

Michimura, Shinji*; Inami, Toshiya; Matsuoka, Eiichi*; Watahiki, Masanori*; Tanigaki, Katsumi*; Onodera, Hideya*

Journal of the Physical Society of Japan, 81(4), p.044711_1 - 044711_5, 2012/04

 Times Cited Count:4 Percentile:35.45(Physics, Multidisciplinary)

Resonant X-ray diffraction experiments on CePd$$_3$$S$$_4$$ were performed at the Ce-$$L$$$$_{3}$$ absorption edge to study the states of quadrupolar ordering below the ferromagnetic transition temperature $$T_{rm C}$$ = 6.3 K. The magnetic structure of CePd$$_3$$S$$_4$$ was reported as a canted ferromagnetic structure with a canting angle of 51$$^circ$$. It has therefore been pointed out that the complex magnetic structure arises from the simultaneous ordering of quadrupole moments. We observed the azimuthal angle dependence of the diffraction intensity of the two forbidden reflections 003 and 104 reflections for both $$pi$$-$$pi$$' and $$pi$$-$$sigma$$' scattering processes. The results revealed that $$O$$$$_2$$$$^{0}$$-type antiferroquadrupolar ordering coexists with magnetic ordering. We infer that the magnetic structure of CePd$$_3$$S$$_4$$ is not a canted structure but a ferrimagnetic structure and that the quadrupole moment is also a primary-order parameter.

JAEA Reports

Final report on the surface-based investigation (phase I) at the Mizunami Underground Laboratory project

Saegusa, Hiromitsu; Seno, Yasuhiro; Nakama, Shigeo; Tsuruta, Tadahiko; Iwatsuki, Teruki; Amano, Kenji; Takeuchi, Ryuji; Matsuoka, Toshiyuki; Onoe, Hironori; Mizuno, Takashi; et al.

JAEA-Research 2007-043, 337 Pages, 2007/03

JAEA-Research-2007-043.pdf:28.14MB

The Mizunami Underground Laboratory (MIU) Project is a comprehensive research project investigating the deep underground environment within crystalline rock being conducted by Japan Atomic Energy Agency at Mizunami City in Gifu Prefecture, central Japan. This report summarizes the results of the Surface-based Investigation Phase, identifies future issues and provides direction for research to be conducted during Construction Phase and Operation Phase. The results compiled in this report will be utilized for the technical knowledge base on geological disposal of HLW, and can be used to enhance the technical basis for waste disposal in general and for development of government regulations.

Journal Articles

Development of superconducting proton linac for ADS

Ouchi, Nobuo; Akaoka, Nobuo*; Asano, Hiroyuki*; Chishiro, Etsuji; Namekawa, Yuya*; Suzuki, Hiroyuki*; Ueno, Tomoaki*; Noguchi, Shuichi*; Kako, Eiji*; Ouchi, Norihito*; et al.

Proceedings of 4th International Workshop on the Utilisation and Reliability of High Power Proton Accelerators, p.175 - 183, 2005/11

no abstracts in English

Journal Articles

RF property of the prototype cryomodule for ADS superconducting linac

Kako, Eiji*; Noguchi, Shuichi*; Ouchi, Norihito*; Shishido, Toshio*; Akaoka, Nobuo*; Kobayashi, Hideki*; Ouchi, Nobuo; Ueno, Tomoaki*; Hara, Hiroshi*; Matsuoka, Masanori*; et al.

Proceedings of 9th European Particle Accelerator Conference (EPAC 2004) (CD-ROM), p.1042 - 1044, 2004/07

no abstracts in English

Journal Articles

Cryogenic performance of the prototype cryomodule for ADS superconducting linac

Ouchi, Norihito*; Kako, Eiji*; Noguchi, Shuichi*; Shishido, Toshio*; Tsuchiya, Kiyosumi*; Akaoka, Nobuo*; Kobayashi, Hideki*; Ouchi, Nobuo; Ueno, Tomoaki*; Hara, Hiroshi*; et al.

Proceedings of 9th European Particle Accelerator Conference (EPAC 2004), p.1033 - 1035, 2004/00

no abstracts in English

Journal Articles

R&D status of superconducting proton linear accelerator for ADS at JAERI

Ouchi, Nobuo; Akaoka, Nobuo*; Asano, Hiroyuki*; Chishiro, Etsuji; Hasegawa, Kazuo; Takeda, Osamu; Yoshikawa, Hiroshi; Matsuoka, Masanori*; Otani, Toshihiro*; Kako, Eiji*; et al.

Proceedings of 11th International Conference on Nuclear Engineering (ICONE-11) (CD-ROM), 6 Pages, 2003/04

no abstracts in English

Journal Articles

Cold test of 600MHz superconducting cryomodule for high intensity proton linac

Ouchi, Nobuo; Akaoka, Nobuo*; Asano, Hiroyuki*; Chishiro, Etsuji; Hasegawa, Kazuo; Takeda, Osamu*; Yoshikawa, Hiroshi; Matsuoka, Masanori*; Otani, Toshihiro*; Kako, Eiji*; et al.

Proceedings of 21st International Linear Accelerator Conference, p.488 - 490, 2003/00

Development of a superconducting proton linac is in progress in collaboration with KEK. In order to demonstrate cavity performance and to study stable accelerating field in a pulsed operation, a 600MHz superconducting cryomodule has been fabricated. The cryomodule includes two 5-cell superconducting cavities of $$beta$$=0.6 and is designed to perform 2K operation. Cold tests of the cryomodule have been performed at the temperature of 4K and 2K. In the tests, heat leak to the cavities, loaded quality factors, tuning sensitivities, frequency shifts against helium vessel pressure and Lorentz force detuning of the cavities were measured. Most of the measured data agreed with their design values, except for the heat leak and the Lorentz force detuning. As the preliminary horizontal test of the cryomodule, high power RF test has been also performed, where the surface peak fields of 10 and 16 MV/m were achieved in CW and pulsed operation, respectively. Now, the optimization of the RF control system is in progress to demonstrate stable accelerating field in a pulsed operation.

Journal Articles

Development of superconducting cavities at JAERI

Ouchi, Nobuo; Kusano, Joichi; Akaoka, Nobuo*; Mizumoto, Motoharu; Inoue, Hitoshi*; Noguchi, Shuichi*; Saito, Kenji*; Takeda, O.*; Murai, T.*; Kijima, Y.*; et al.

KEK Proceedings 99-25, p.33 - 37, 2000/02

no abstracts in English

Journal Articles

Present status of R&D for the superconducting proton linac at JAERI

Mizumoto, Motoharu; Kusano, Joichi; Hasegawa, Kazuo; Ouchi, Nobuo; Oguri, Hidetomo; Ichihara, Masahiro; Tomisawa, Tetsuo; Ito, Takashi; Chishiro, Etsuji*; Ikegami, Masanori*; et al.

KEK Proceedings 99-25, p.3 - 5, 2000/02

no abstracts in English

Journal Articles

Development of superconducting linac for the KEK/JAERI joint project

Ouchi, Nobuo; Mizumoto, Motoharu; Kusano, Joichi; Chishiro, Etsuji; Hasegawa, Kazuo; Akaoka, Nobuo*; Saito, Kenji*; Noguchi, Shuichi*; Kako, Eiji*; Inoue, Hitoshi*; et al.

Proceedings of 20th International Linac Conference (CD-ROM), 1 Pages, 2000/00

no abstracts in English

Journal Articles

Development of superconducting cavity for high power proton acceleration; Characteristics of multi-cell cavities

Kusano, Joichi; Ouchi, Nobuo; Akaoka, Nobuo*; Takeda, O.*; Matsuoka, Masanori*; Saito, Kenji*; Noguchi, Shuichi*; Inoue, Hitoshi*; Mukugi, Ken*; Mizumoto, Motoharu

Proceedings of 25th Linear Accelerator Meeting in Japan, p.317 - 319, 2000/00

no abstracts in English

Journal Articles

High energy negative-ion based neutral beam injection system for JT-60U

Kuriyama, Masaaki; ; Araki, Masanori; ; Hanada, Masaya; Inoue, Takashi; Kawai, Mikito; Kazawa, Minoru; *; ; et al.

Fusion Engineering and Design, 26, p.445 - 453, 1995/00

 Times Cited Count:41 Percentile:95.66(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Beam direct converter with varying magnetic field

Matsuoka, Mamoru; Araki, Masanori; Mizuno, Makoto

Fusion Technology, 26, p.1296 - 1303, 1994/12

no abstracts in English

Journal Articles

Construction of a 500keV/negative-ion-based NBI system for JT-60U

Kuriyama, Masaaki; ; Araki, Masanori; ; Hanada, Masaya; Inoue, Takashi; Kawai, Mikito; Kazawa, Minoru; *; ; et al.

15th IEEE/NPSS Symp. on Fusion Engineering,Vol. 1, 0, p.470 - 473, 1993/00

no abstracts in English

JAEA Reports

A Review of JAERI R&D activities on the negative-ion-based neutral beam injection system

Ohara, Yoshihiro; Akiba, Masato; Araki, Masanori; Dairaku, Masayuki; Hanada, Masaya; Inoue, Takashi; Kojima, Hiroaki; Kuriyama, Masaaki; *; Matsuoka, Mamoru; et al.

JAERI-M 90-154, 119 Pages, 1990/09

JAERI-M-90-154.pdf:3.06MB

no abstracts in English

Journal Articles

Beam stops of JT-60 neutral beam injector

Kuriyama, Masaaki; Araki, Masanori; Horiike, Hiroshi; Matsuda, Shinzaburo; Matsuoka, Mamoru; Ohara, Yoshihiro; Okumura, Yoshikazu; Shibanuma, Kiyoshi; Shirakata, Hirofumi; Tanaka, Shigeru

Fusion Engineering and Design, 9, p.237 - 243, 1989/00

no abstracts in English

26 (Records 1-20 displayed on this page)