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Zonal flows and long-distance correlations during the formation of the edge shear layer in the TJ-II stellarator

I Calvo, B A Carreras, L Garcia, M A Pedrosa, C Hidalgo2009年Plasma Physics and Controlled FusionIF 2.2出版社

A theoretical interpretation is given for the observed long-distance correlations in potential fluctuations in TJ-II. The value of the correlation increases above the critical point of the transition for the emergence of the plasma edge shear flow layer. Mean (i.e. surface averaged, zero-frequency) sheared flows cannot account for the experimental results. A model consisting of four envelope equations for the fluctuation level, the mean flow shear, the zonal flow amplitude shear and the averaged pressure gradient is proposed. It is shown that the presence of zonal flows is essential to reproduce the main features of the experimental observations.

日本語訳

TJ-IIにおけるポテンシャル変動の長距離相関に対して理論的解釈が与えられる。相関の値は、プラズマ端部シア流層の出現の臨界点を超えると増大する。平均(すなわち表面平均、ゼロ周波数)シア流は実験結果を説明できない。変動レベル、平均流シア、帯状流振幅シア、および平均圧力勾配に対する4つの包絡線方程式からなるモデルが提案される。帯状流の存在が実験観測の主要な特徴を再現するために不可欠であることが示される。

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tj-ii高精度(タイトル一致)

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StellaratorZonal flowTJ-II
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