2006 Fiscal Year Final Research Report Summary
Foundations for the theory of transport in thermonuclear fusion plasmas
| Project/Area Number |
15360495
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Nuclear fusion studies
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| Research Institution | National Institute for Fusion Science |
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Principal Investigator |
ITOH Kimitaka National Institute for Fusion Science, Professor, 大型ヘリカル研究部, 教授 (50176327)
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| Co-Investigator(Kenkyū-buntansha) |
SANUKI Heiji National Institute for Fusion Science, Professor, 大型ヘリカル研究部, 教授 (80109355)
SUGAMA Hideo National Institute for Fusion Science, Professor, 大型ヘリカル研究部, 教授 (80202125)
TODA Shinichiro National Institute for Fusion Science, Research Associate, 大型ヘリカル研究部, 助手 (60332186)
TODO Yasushi National Institute for Fusion Science, Associate Professor, 理論シミュレーション研究センター, 助教授 (00249971)
FUKUYAMA Atsushi Kyoto University, Professor, 大学院工学研究科, 教授 (60116499)
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| Project Period (FY) |
2003 – 2006
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| Keywords | burning plasmas / transport theory / fluctuation with long correlation length / effect of ignition on transport / meso-scale turbulence / high energy particles / zonal flows / theory of bifurcation in transport |
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| Research Abstract |
The objective of this research is to form a foundation for the theory of transport of plasmas, in which thermonuclear fusion reaction takes place. In particular, focuses are made upon the issues, for which the burning plasmas show qualitative differences from non-burning plasmas. For instance, the fusion ignition itself could be an origin of plasma turbulence that is responsible for the anomalous transport; fluctuations with long correlation length could have substantial impacts on transport; new type of transport bifurcation could occur in ignited plasmas.
The research has made clear-cut contribution for these problems. One example is the transport of fusion-products. It was found that, when the Kubo-number of turbulence is larger than unity, the large-orbit effect of alpha particles enhances (contrary to the conventional knowledge) cross-field transport. Prototypical role of zonal flows, which have long radial correlation length, on the turbulent transport was analyzed thoroughly. Theoretical formula of turbulent transport coefficients, for which the impacts of zonal flows are renormalized, were obtained. A new type of transport bifurcation was also identified; in this transport bifurcation, the radial electric field, zonal flows and energetic particles play essential roles. Thus, this research programme has achieved a firm progress in understanding the turbulent transport in fusion burning plasmas.
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Research Products
(52 results)
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[Journal Article] Bispectral analysis applied to coherent floating potential fluctuations with geodesic acoustic wave frequency obtained in the edge plasmas on JFT-2M2006
Author(s)
Nagashima, K.Itoh, S.-I.Itoh, A.Fujisawa, K.Hoshino, Y.Takase, M.Yagi, A.Ejiri, K.Ida, K.Shinohara, K.Uehara, Y.Kusama, JFT-2M group
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Journal Title
Plasma Phys. Contr. Fusion 48
Pages: S1
Description
「研究成果報告書概要(和文)」より
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[Journal Article] Geodesic-Acoustic-Mode in JFT-2M tokamak plasmas2006
Author(s)
T.Ido, Y.Miura, K.Kamiya, Y.Hamada, K.Hoshino, A.Fujisawa, K.Itoh, S.-I.Itoh, A.Nishizawa, H.Ogawa, Y.Kusama, JFT-2M group
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Journal Title
Plasma Phys. Contr. Fusion 48
Pages: 541
Description
「研究成果報告書概要(和文)」より
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[Journal Article] Experimental study of nonlinear processes in edge turbulence of toroidal plasmas2006
Author(s)
Y.Nagashima, K.Hoshino, K.Shinohara, K.Uehara, Y.Kusama, K.Nagaoka, A.Fujisawa, K.Ida, Y.Yoshimura, S.Okamura, K.Matsuoka, A.Ejiri, Y.Takase, K.Itoh, M.Yagi, S.-I.Itoh, JFT-2M group, CHS group
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Journal Title
J. Plasma Fusion Research 1
Pages: 041
Description
「研究成果報告書概要(和文)」より
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[Journal Article] Physics of Zonal Flow2006
Author(s)
K.Itoh, S.-l.Itoh, P.H.Diamond, T.S.Hahm, A.Fujisawa, G.R.Tynan, M.Yagi, Y.Nagashima
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Journal Title
Phys.Plasmas 13 No.5
Pages: 055502
Description
「研究成果報告書概要(欧文)」より
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