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Reverse flow and parameter profiles in a dense tokamak divertor plasma

S.I. Krasheninnikov1992年被引用 34Nuclear FusionIF 3出版社

The analytical theory devised to describe parameter distribution and flow patterns of a dense plasma in the scrape-off-layer (SOL) of a tokamak agrees reasonably well with 2D modelling results as well as experimental data and can be used for quantitative assessments of the parameters of interest. It is shown that a reverse flow (away from the divertor plates) occurs in a SOL plasma with high recycling, and that the characteristic width of the layer with reverse plasma flow ΔT is narrower than the characteristic widths of the radial profiles of plasma temperature and density ΔT, which are approximately equal to each other. The characteristic value of the reverse flow Γm exceeds the particle flow from the main plasma volume to the edge layer Γs. The rather complex convective structures which occur in the SOL as a result of this may lead to localization of impurities in the region of the X-point, preventing them from reaching the bulk tokamak plasma. These effects might be the cause of the high radiation energy losses from the divertor region in the JT-60 tokamak in the improved divertor confinement regime

日本語訳

トカマクのスクレイプオフ層(SOL)における高密度プラズマのパラメータ分布と流動を記述するために考案された解析理論は、2次元モデリングの結果および実験データと概ね良好に一致し、対象パラメータの定量的評価に使用できることが示されている。高リサイクリング状態のSOLプラズマでは、ダイバータ板から離れる方向の逆流が発生し、逆流プラズマ層の特性幅ΔTは、プラズマ温度および密度の動径方向プロファイルの特性幅ΔTよりも狭く、後者の両者は互いにほぼ等しいことが示されている。逆流の特性値Γmは、主プラズマから周辺層への粒子流Γsを上回る。この結果として生じるSOL内の比較的複雑な対流構造は、不純物をX点領域に局在化させ、不純物が主プラズマ本体へ到達することを防ぐ可能性がある。これらの効果は、改善されたダイバータ閉じ込め regime におけるJT-60トカマクのダイバータ領域からの高い放射損失の原因である可能性がある。

装置

jt-60sa中精度(概要文一致)

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DivertorDivertor plasma
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