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Fluid features of the stochastic layer transport in LHD

Y. Feng, M. Kobayashi, T. Morisaki, S. Masuzaki, J. Miyazawa, B.J. Peterson, S. Morita, M. Shoji, K. Ida, I. Yamada2008年被引用 40Nuclear FusionIF 3出版社

The stochastic scrape-off layer (SOL) of the helical divertor configuration in LHD exhibits a rather complex field topology where remnant magnetic islands, thin edge surfaces and stochastic field lines coexist. Using the three-dimensional edge transport code package, EMC3-EIRENE, the paper presents a numerical study of the stochastic layer transport, aimed, first of all, at clarifying to what extent the plasma as a fluid is influenced by the stochastic behaviour of the magnetic field lines. Revealed and analysed are the individual roles of different regions of the stochastic layer for plasma, impurity and neutral transport. Topics addressed and discussed are island flattening effects, flow patterns and flow damping, recycling flux suppression, rollover of divertor flux, detachment and Marfe formation and dynamics. Comparisons with experimental results are also presented.

日本語訳

LHDのヘリカルダイバータ配位における確率的スクレイプオフ層(SOL)は、残留磁気島、薄い端面、確率的磁力線が共存するかなり複雑な磁場トポロジーを示す。3次元エッジ輸送コードパッケージEMC3-EIRENEを用いて、本論文は確率的層輸送の数値研究を提示し、第一に、流体としてのプラズマが磁力線の確率的挙動によってどの程度影響を受けるかを明らかにすることを目的としている。確率的層の異なる領域がプラズマ、不純物、中性子輸送に対して果たす個々の役割が明らかにされ、分析される。取り上げられ議論されるトピックは、島の平坦化効果、流れパターンと流れの減衰、リサイクリングフラックスの抑制、ダイバータフラックスのロールオーバー、デタッチメントとMarfeの形成およびダイナミクスである。実験結果との比較も提示される。

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