Relativistic downshift frequency effects on ECE measurements of electron temperature and density in torus plasmas

Sato, Masayasu; Isayama, Akihiko; Inagaki, Shigeru*; Nagayama, Yoshio*; Kawahata, Kazuo*; Iwama, Naofumi*

Europhysics Conference Abstracts (CD-ROM), 29C, 4 Pages, 2005/00

http://epsppd.epfl.ch/Tarragona/pdf/P4_090.pdf

no abstracts in English

Nonperturbative effects of energetic ions on Alfvn eigenmodes

Todo, Yasushi*; Nakajima, Noriyoshi*; Shinohara, Koji; Takechi, Manabu; Ishikawa, Masao; Yamamoto, Satoshi*

Proceedings of 20th IAEA Fusion Energy Conference (FEC 2004) (CD-ROM), 8 Pages, 2004/11

http://www-naweb.iaea.org/napc/physics/fec/fec2004/datasets/TH_3-1Ra.html

Linear properties and nonlinear evolutions of an energetic-ion driven instability in a JT-60U plasma were investigated using a simulation code for MHD and energetic particles. The spatial profile of the unstable mode peaks near the plasma center where the safety factor profile is flat. The real frequency of the mode is close to the experimental starting frequency of the fast frequency sweeping mode. The simulation results demonstrate that the energetic ion orbit width and the energetic ion pressure significantly broaden radial profile of the unstable mode. For the experimental condition of JT-60U, the energetic ions broaden the spatial profile of the unstable mode by a factor of 3. The unstable mode is primarily induced by the energetic particles. It is demonstrated that the frequency shifts both upward and downward in the nonlinear evolution at the rate close to that of the fast frequency sweeping mode. In addition to the energetic particle mode in JT-60U, an investigation of TAE in an LHD-like plasma using the simulation code for the helical coordinate system is reported.

Comparison of electron internal transport barriers in the large helical device and JT-60U plasmas

Ida, Katsumi*; Fujita, Takaaki; Fukuda, Takeshi*; Sakamoto, Yoshiteru; Ide, Shunsuke; Toi, Kazuo*; Inagaki, Shigeru*; Shimozuma, Takashi*; Kubo, Shin*; Idei, Hiroshi*; et al.

Plasma Physics and Controlled Fusion, 46(5A), p.A45 - A50, 2004/05

https://doi.org/10.1088/0741-3335/46/5A/004

no abstracts in English

Comparative study of MHD instabilities in LHD and JT-60U; Instability at during counter NB

Isayama, Akihiko; Oyama, Naoyuki; Fujita, Takaaki; Inagaki, Shigeru*; Watanabe, Kiyomasa*; Toi, Kazuo*

Annual Report of National Institute for Fusion Science; April 2003 - March 2004, P. 23, 2003/10

http://www.nifs.ac.jp/report/annrep04/00000001.pdf

no abstracts in English

Heating and current drive by N-NBI in JT-60U and LHD

Kaneko, Osamu*; Yamamoto, Takumi; Akiba, Masato; Hanada, Masaya; Ikeda, Katsunori*; Inoue, Takashi; Nagaoka, Kenichi*; Oka, Yoshihide*; Osakabe, Masaki*; Takeiri, Yasuhiko*; et al.

Fusion Science and Technology, 44(2), p.503 - 507, 2003/09

https://doi.org/10.13182/FST03-A386

High energy negative-ion-based neutral beam injection (N-NBI) is expected as an efficient and reliable tool of heating and current driving for reactor plasmas such as ITER. A world wide activity on developing technology of negative ion production and beam formation started in 1980's and the great progress has been achieved up to now. In particular, Japan has two large projects that planned adopting N-NBI for real plasma experiments; the JT-60U tokamak and the LHD heliotron, which further motivated the R&D activity. These R&D programs were carried out at JAERI and NIFS separately in Japan, and both were successfully done. The first beam injection experiment was made on the JT-60U in 1996, followed by the LHD in 1998. They were the first experiments on heating plasma by high energy beam in tokamaks and in stellerators, and the obtained results were very promising.

Imaging bolometer for a burning plasma experiment

Peterson, B. J.*; Ashikawa, Naoko*; Konoshima, Shigeru; Ingesson, L. C.*; Walker, C. I.*

Proceedings of 30th EPS Conference on Controlled Fusion and Plasma Physics (CD-ROM), 4 Pages, 2003/00

Research and development of imaging bolometers has progressed from the Segmented Mask IR Imaging Bolometer to the IR Imaging Video Bolometer (IRVB). Meanwhile tests of conventional resistive bolometers have shown their weakness to the high neutron flux. In this paper we compare the IRVBs currently installed in the Large Helical Device with a conceptual design for the JT-60U tokamak and a feasibility study for the International Thermonuclear Experimental Reactor. Comparisons are made with conventional resistive bolometers in terms of sensitivity, spatial and time resolution, port access requirements, steady-state operation, long term durability and shielding of stray ECH power.

Proceedings of the Joint Meeting on Plasma Surface Interaction (PSI) and Plasma Facing Components (PFC); December 1, 2000, Naka Fusion Establishment, Naka-machi, Japan

NBI Heating Laboratory

JAERI-Conf 2001-001, 122 Pages, 2001/03

JAERI-Conf-2001-001.pdf:21.64MB

The joint meeting on Plasma Surface Interaction (PSI) and Plasma Facing Components (PFC) was held in Naka Fusion Establishment on December 1, 2000. This meeting has been held to enhance information exchange between PSI and PFC researchers. In the present meeting, there were 11 presentations which covered current status of PSI and PFC studies for large fusion devices such as ITER, JT-60 and LHD, and basic studies on Hydrogen isotope behavior in the fusion material. This report includes abstracts and view graphs of these presentations.

Electromagnetic analysis in the tokamak fusion reactor and large helical device

Koizumi, Koichi; Yamazaki, Kozo*

Purazuma, Kaku Yugo Gakkai-Shi, 72(12), p.1352 - 1361, 1996/12

http://ci.nii.ac.jp/naid/110003826659

no abstracts in English

History and organization of fusion research and development in Japan

Oikawa, Akira

Fusion Technology, 17, p.232 - 235, 1990/03

no abstracts in English