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Formation of a natural X-point multifaceted asymmetric radiation from the edge in numerical simulations of divertor plasmas

V Kotov, D Reiter2012年Plasma Physics and Controlled FusionIF 2.2出版社

Multifaceted asymmetric radiation from the edges (MARFEs) are regions of high-density and low-temperature plasma observed under certain conditions at the tokamak edge. Such structures are found to form in a natural way on the closed flux surfaces near the X-point in 2D numerical simulations (B2-EIRENE) of the divertor plasmas at high discharge densities. Stable steady-state solutions can be obtained by the conventional edge code if the hydrogen line-radiation opacity is taken into account in the model, both with and without impurity radiation. In addition to extra power losses from the MARFE the detached divertor solution is affected due to (i) reduction of the separatrix temperature and thus plasma pressure; (ii) additional momentum losses due to friction with atoms produced by the recombining plasma of the MARFE.

日本語訳

周辺部多面非対称放射(MARFE)は、トカマク周辺部において特定の条件下で観測される高密度・低温プラズマ領域である。このような構造は、高密度放電時におけるダイバータプラズマの2次元数値シミュレーション(B2-EIRENE)において、X点近傍の閉磁気面領域に自然に形成されることが見出されている。水素放射の不透明度をモデルに考慮すれば、不純物放射の有無にかかわらず、従来の周辺部コードによって安定な定常解を得ることができる。MARFEによる追加のパワー損失に加えて、ダイバータの非接触状態は、(i)セパラトリックス温度の低下によるプラズマ圧力の減少、および(ii)MARFEの再結合プラズマによって生成された原子との摩擦による追加の運動量損失によって影響を受ける。

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