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          Institute: MPI für Plasmaphysik     Collection: Conference Papers     Display Documents

ID: 60016.0, MPI für Plasmaphysik / Conference Papers
A demonstration of magnetic field optimization in LHD
Authors:Murakami, S.; Yamada, H.; Wakasa, A.; Sasao, M.; Isobe, M.; Ozaki, T.; Goncharov, P.; Saida, T.; Lyon, J. F.; Osakabe, M.; Narihara, K.; Tanaka, K.; Inagaki, H.; Morita, S.; Ida, K.; Miyazawa, J.; Idei, H.; Ikeda, K.; Kubo, S.; Kumazawa, R.; Mutoh, T.; Oka, Y.; Saito, K.; Seki, T.; Takeiri, Y.; Torii, Y.; Tumori, K.; Watari, T.; Watanabe, K. Y.; Funaba, H.; Yokoyama, M.; Maassberg, H.; Beidler, C. D.; Itoh, K.; Kaneko, O.; Komori, A.; Akiyama, T.; Ashikawa, N.; Emoto, M.; Goto, M.; Kawahata, K.; Kawazome, H.; Khlopenkov, K.; Kobuchi, T.; Kostrioukov, A.; Liang, Y.; Masuzaki, S.; Minami, T.; Morisaki, T.; Muto, S.; Nagayama, Y.; Nakamura, Y.; Nakanishi, H.; Narushima, Y.; Nishimura, K.; Noda, N.; Notake, T.; Nozato, H.; Ohdachi, S.; Ohyabu, N.; Peterson, B. J.; Sagara, A.; Sakakibara, S.; Sakamoto, R.; Sato, K.; Sato, M.; Shimozuma, T.; Shoji, M.; Suzuki, H.; Takeuchi, N.; Tamura, N.; Toi, K.; Tokuzawa, T.; Xu, Y.; Yamada, I.; Yamamoto, S.; Yamamoto, T.; Yoshimura, Y.; Yoshinuma, M.; Tanaka, M. Y.; Okamura, S.; Yoshimura, S.; Nagaoka, K.; Satow, T.; Imagawa, S.; Mito, T.; Ohtake, I.; Uda, T.; Ohkubo, K.; Sudo, S.; Yamazaki, K.; Matsuoka, K.; Motojima, O.; Hamada, Y.; Fujiwara, M.
Publisher:International Atomic Energy Agency
Place of Publication:Vienna
Date of Publication (YYYY-MM-DD):2003
Title of Proceedings:Fusion Energy 2002
Sequence Number:EX/C5-3
Physical Description:CD-ROM
Name of Conference/Meeting:19th Fusion Energy Conference
Place of Conference/Meeting:Lyon (FR)
(Start) Date of Conference/Meeting
End Date of Conference/Meeting 
Review Status:Internal review
Audience:Experts Only
Abstract / Description:The behaviors of trapped particles in helical ripples are complicated and would enhance the radial transport of energetic particles and thermal plasma (neoclassical transport) in heliotrons. Thus the improvement of energetic particle confinement and the reduction of the neoclassical transport are key issues for a future reactor based on the helical system. On the other hand, recent LHD and CHS experimental results have shown good plasma performances in the "inward shifted" configurations, in which the ideal MHD stability analysis predicts instability. These facts suggest that the MHD stability problem is not a severe one for plasma confinement in heliotrons and makes it reasonable to consider shifting the magnetic axis further inwards in LHD where further improvement of the neoclassical transport and energetic particle transport can be expected. In this paper, we show an optimized configuration of LHD to a level typical of so-called "advanced stellarators" and demonstrate experimentally the effect of magnetic field optimization on the energetic particle confinement and the thermal plasma transport (neoclassical transport).
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Plasmaphysik/E3
External Affiliations:National Institute for Fusion Science, Toki, Japan; Graduate School of Engineering, Hokkaido University, Sapporo, Japan; Department of Fusion Science, School of Mathematical and Physical Science, Graduate University for Advanced Studies, Hayama, Japan; Oak Ridge National Laboratory, Oak Ridge, TN, USA; Department of Energy Engineering and Science, Nagoya University, Japan; Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Tokyo, Japan; Graduate School of Energy Science, Kyoto University, Uji, Japan; Graduate School of Frontier Sciences, The University of Tokyo, Japan
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