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Edge toroidal momentum and its effect on the scrape-off layer

A.V. Chankin, W. Kerner1996年Nuclear FusionIF 3出版社

Non-zero toroidal momentum in the direction of the main plasma current near the last closed flux surface (LCFS) is often observed in experiments. Such a momentum, if included as a boundary condition in the scrape-off layer (SOL) modelling, could have a profound effect on the poloidal dependence of the plasma parameters in the SOL. In a single-null divertor configuration, the toroidal momentum can generate asymmetries in the plasma parameters between the strike zones. The additional torque exerted onto the SOL due to the toroidal rotation causes compression of the plasma along the field lines, increasing the plasma pressure in the divertor branch that represents the ion drift side. The ion drift side is located at the inner strike zone when the ion Del B drift is directed towards the target, and at the outer strike zone for the reversed Del B drift. The expected influence of the toroidal momentum on the SOL asymmetries agrees qualitatively with experiment. It may help to explain the experimentally observed dependence of the asymmetries between the strike zones on the direction of the Del B drift

日本語訳

プラズマ電流の方向における非ゼロのトロイダル運動量が、最終閉鎖磁気面(LCFS)近傍で実験的にしばしば観測される。このような運動量は、スクレイプオフ層(SOL)モデリングにおける境界条件として含まれる場合、SOL内のプラズマパラメータのポロイダル依存性に大きな影響を及ぼし得る。シングルヌルダイバータ配位において、トロイダル運動量はストライクゾーン間のプラズマパラメータの非対称性を生成し得る。トロイダル回転によるSOLへの追加のトルクは、磁力線に沿ったプラズマの圧縮を引き起こし、イオンのDel Bドリフト側を表すダイバータ分支におけるプラズマ圧力を増加させる。イオンのDel Bドリフト側は、イオンのDel Bドリフトがターゲット方向を向いている場合には内側ストライクゾーンに位置し、Del Bドリフトが反転している場合には外側ストライクゾーンに位置する。SOLの非対称性に対するトロイダル運動量の影響は、実験と定性的に一致すると予想される。これは、Del Bドリフトの方向に対するストライクゾーン間の非対称性の実験的に観測された依存性を説明する一助となり得る。

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Scrape-off layerToroidal momentum
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