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Flow structure and shear generation in the 3D SOL of a circular tokamak plasma in Aditya

Bibhu Prasad Sahoo, Devendra Sharma, Ratneshwar Jha, Yühe Feng2015年被引用 5Nuclear FusionIF 3出版社

The presence of a poloidal ring limiter in the tokamak Aditya, which has a circular plasma, presents an interesting scrape-off layer (SOL) plasma configuration where small to large scale spatial variations of plasma parameters are expected. Flow shears in the Aditya SOL are routinely observed and their strong correlations with experimentally measured edge fluctuations in the floating potential and SOL currents/drifts have been thoroughly investigated in the recent past. The first implementation of the three-dimensional (3D) SOL plasma transport simulation code EMC3-EIRENE allows the possibility of investigating the SOL's complexity and associated short and long scale spatial patterns in the flow and plasma transport, and their impact on the confinement properties of the plasma in the edge region. A detailed investigation of the first results from the 3D plasma transport simulations shows interesting 3D flow patterns and the existence of resulting parallel and radial flow shears in the device's SOL. In this work the origin of these complex flow patterns is studied and their correlation with the observed behavior of the flows in the device is discussed.

日本語訳

トカマクAdityaにおけるポロイダルリングリミターの存在は、円形プラズマを有する同装置において、プラズマパラメータの小規模から大規模までの空間変動が予想される興味深いスクレイプオフ層(SOL)プラズマ配置を呈している。AdityaのSOLにおける流れのシアは日常的に観測されており、浮遊電位およびSOL電流/ドリフトにおける実験的に測定された端部変動との強い相関は、近年詳細に調査されている。三次元(3D)SOLプラズマ輸送シミュレーションコードEMC3-EIRENEの初めての実装により、SOLの複雑性および流れとプラズマ輸送における関連する短・長スケールの空間パターン、ならびにそれらが端部領域のプラズマの閉じ込め特性に与える影響を調査する可能性が開かれた。3Dプラズマ輸送シミュレーションからの最初の結果の詳細な調査は、興味深い3D流れパターンと、装置のSOLにおける結果として生じる平行および径方向の流れのシアの存在を示している。本研究では、これらの複雑な流れパターンの起源を調査し、装置内で観測された流れの挙動との相関について議論する。

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Scrape-off layerADITYA
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