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Simulations of edge and scrape off layer turbulence in mega ampere spherical tokamak plasmas

F Militello, W Fundamenski, V Naulin, A H Nielsen2012年Plasma Physics and Controlled FusionIF 2.2出版社

The L-mode interchange turbulence in the edge and scrape-off-layer (SOL) of the tight aspect ratio tokamak MAST is investigated numerically. The dynamics of the boundary plasma are studied using the 2D drift-fluid code ESEL, which has previously shown good agreement with large aspect ratio machines. In this context, a MAST-TCV comparison is presented in order to link the present analysis to well documented references. Next, scans of various edge parameters, such as density, temperature and current, are performed in the simulations with the aim of characterizing the profiles, fluctuation level and statistics of the edge/SOL density and temperature. In addition, we also discuss how the system changes when the length of the divertor leg is modified. This allows one to better understand the regime of operation of the Super-X divertor which will be implemented on MAST-Upgrade. The results obtained qualitatively agree with experimental observations. In particular, a universal behaviour of the fluctuation statistics is found for disparate edge conditions. Furthermore, the density and temperature decay lengths are inversely proportional to the plasma current and the edge temperature, while they are rather insensitive to the edge density (not to be confused with the line-averaged density).

日本語訳

アスペクト比の小さいトカマクMASTにおける周辺部およびスクレイプオフ層(SOL)のLモード交換型乱流を数値的に調べた。境界プラズマのダイナミクスは、アスペクト比の大きい装置で良好な一致を示すことがこれまでに確認されている2次元ドリフト流体コードESELを用いて研究した。この文脈において、本解析を十分に文書化された参考文献と関連付けるために、MAST-TCV比較を示す。次に、密度、温度、電流などの様々な周辺パラメータのスキャンをシミュレーションにおいて実施し、周辺部およびSOLの密度と温度のプロファイル、変動、統計的性質を特徴付けることを目的とした。さらに、ダイバータ脚部の長さを変更した場合の系の変化についても議論する。これにより、MAST-Upgradeに実装予定のSuper-Xダイバータの運転領域をより深く理解することが可能となる。得られた結果は実験観測と定性的に一致する。特に、異なる周辺条件において変動統計の普遍的な挙動が見出された。さらに、密度および温度の減衰長はプラズマ電流と周辺温度に反比例する一方、周辺密度(線平均密度ではない)には比較的鈍感であることが示された。

装置

mast中精度(概要文一致)

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Spherical tokamak
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