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Numerical investigations of edge plasma flows in the Tore Supra tokamak

R Zagórski, J P Gunn, I Nanobashvili2007年Plasma Physics and Controlled FusionIF 2.2出版社

The 2D boundary layer code TECXY has been used to simulate edge plasma parameters in the Tore Supra tokamak. Experimental situations have been analysed when the plasma contact point is shifted to different poloidal positions (limiter at bottom, top, outboard and inboard midplane) as well as the edge plasma conditions during lower hybrid RF power scan experiments. With the results of the calculations it was possible to reproduce experimentally observed changes to the flow pattern in the scrape-off-layer (SOL) for different plasma positions. These changes can be associated with the dependence of the radial electric field and the corresponding E × B drift velocity on the limiter position as well as to the poloidal asymmetries of the input particle flux. However, the code results with 'standard radial transport' did not show the large changes to the SOL widths as observed in the experiment. In order to reproduce in the calculations the observed differences in the SOL width, it was necessary to assume strong convective (or diffusive) radial plasma flow localized at the outboard midplane.

日本語訳

2次元境界層コードTECXYを用いて、Tore Supraトカマクにおける周辺プラズマパラメータをシミュレーションした。プラズマ接触点が異なるポロイダル位置(リミターが底部、頂部、外側、内側中平面)に移動した実験状況と、低域混成RFパワースキャン実験中の周辺プラズマ条件を解析した。計算結果により、異なるプラズマ位置におけるスクレイプオフ層(SOL)内の流れパターンの実験的に観測された変化を再現することが可能であった。これらの変化は、径方向電場および対応するE × Bドリフト速度のリミター位置への依存性と、入力粒子フラックスのポロイダル非対称性に関連付けることができる。しかしながら、「標準的な径方向輸送」を用いたコード結果は、実験で観測されたようなSOL幅の大きな変化を示さなかった。計算において観測されたSOL幅の差異を再現するためには、外側中平面に局在する強い対流的(または拡散的)径方向プラズマ流を仮定する必要があった。

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Edge plasmaTore SupraPlasma flow
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