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On the interplay between turbulent forces and neoclassical particle losses in zonal flow dynamics

R. Gerrú, S. Mulas, U. Losada, F. Castejón, B. Liu, T. Estrada, B.Ph. van Milligen, C. Hidalgo2019年被引用 8Nuclear FusionIF 3出版社

This study presents an investigation into the connection between radial electric fields, Reynolds stress gradients and long range correlations (LRCs), with the latter being a proxy for zonal flows (ZFs), in different plasma scenarios in the TJ-II stellarator. Monte Carlo simulations showed that radial electric fields with a similar size to those experimentally measured affect neoclassical orbit losses. Although the order of magnitude of turbulent acceleration was comparable to the neoclassical damping of perpendicular flows, we found that the dependence of this acceleration on the radial electric field did not correlate with the evolution of the LRC amplitude, indicating that turbulent acceleration alone cannot explain the dynamics of ZFs. These results are in line with the expectation that the interplay between turbulent and neoclassical mechanisms is an important ingredient of the dynamics of edge ZF.

日本語訳

本研究は、異なるプラズマシナリオにおけるTJ-IIステラレーターの動径電場、レイノルズ応力勾配、および長距離相関(LRC)の間の関連性を調査したものであり、後者は帯状流(ZF)の代理指標である。モンテカルロシミュレーションにより、実験的に測定されたものと同程度の大きさの動径電場が新古典軌道損失に影響を及ぼすことが示された。乱流加速のオーダーが垂直流の新古典減衰と同程度であったが、この加速の動径電場への依存性はLRC振幅の変化と相関しないことが判明し、乱流加速のみでは帯状流の動態を説明できないことが示された。これらの結果は、乱流機構と新古典機構の相互作用がエッジ帯状流の動態の重要な要素であるという予想と一致する。

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tj-ii低精度(概要文一致)

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Zonal flow
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