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Enhancements of residual Reynolds stresses by magnetic perturbations in the edge plasmas of the J-TEXT tokamak

K.J. Zhao, Z.P. Chen, Yuejiang Shi, P.H. Diamond, J.Q. Dong, Z.Y. Chen, Y.H. Ding, G. Zhuang, Y.B. Liu, H.Q. Zhang2020年被引用 7Nuclear FusionIF 3出版社

Enhancements of residual Reynolds stresses and symmetry breaking with resonant magnetic perturbations (RMPs) are presented. These experiments were performed using a Langmuir probe array in the edge plasmas of the J-TEXT tokamak. This study aims to explain the mechanisms for generating residual stresses and intrinsic rotations. It is observed that with RMPs, peaked residual stresses, steeper pressure gradients and stronger shear layers all appear around the resonant surface. The toroidal rotation is accelerated in the direction of the plasma current and shows a correlation with turbulence and the measured residual stresses near the resonant surfaces of RMPs. Symmetry breaking induced by magnetic islands is proposed as a new mechanism, which qualitatively explains the enhanced residual stresses and the acceleration of the toroidal rotation. The changes to the residual stresses and symmetry breaking with RMPs near the last closed surface are also discussed.

日本語訳

共鳴磁場摂動(RMPs)による残留レイノルズ応力と対称性の破れの増強が提示される。これらの実験は、J-TEXTトカマクの周辺プラズマにおいてラングミュアプローブアレイを用いて行われた。この研究は、残留応力と固有回転を生成するメカニズムを説明することを目的としている。RMPsを用いると、ピーク状の残留応力、より急峻な圧力勾配、より強いシア層がすべて共鳴面の周囲に現れることが観測された。トロイダル回転はプラズマ電流の方向に加速され、RMPsの共鳴面近傍の乱流および測定された残留応力と相関を示す。磁気島によって誘起される対称性の破れが新しいメカニズムとして提案され、これは増強された残留応力とトロイダル回転の加速を定性的に説明する。最終閉曲面近傍でのRMPsによる残留応力と対称性の破れの変化についても議論される。

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Magnetic perturbationEdge plasmaTEXTJ-TEXT
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