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Contribution of the ion diamagnetic flow to poloidal rotation and pressure asymmetries in the SOL

A.V. Chankin, P.C. Stangeby2001年被引用 13Nuclear FusionIF 3出版社

Under typical conditions of high recycling divertor plasmas, the ion diamagnetic flow makes the largest contribution to the ion poloidal rotation in the SOL. Owing to toroidal effects, the net poloidal rotation in the SOL gives rise to ion parallel Pfirsch-Schlüter flows, which are sustained by an up-down pressure asymmetry which reverses with toroidal field (Bϕ) reversal. The up-down pressure asymmetry in turn gives rise to net, surface averaged, radial currents r arising from the surface averaging of local diamagnetic currents jr = (1/rB)(∂p/∂θ) due to toroidal effects. The radial divergence of radial currents r can exist in the SOL because of electrical contact with the target. The resulting net toroidal r Bθ force in the direction of the main plasma current creates an in-out pressure asymmetry in favour of the ion drift side (which is the inner side in normal Bϕ and the outer side in reversed Bϕ plasmas). This pressure asymmetry should result in higher density and low temperature plasma in the inner divertor leg in normal Bϕ discharges and should also make the distribution of density and temperature between the targets more equal in reversed Bϕ discharges, consistent with the main trends observed in experiments with toroidal field reversal. The proposed mechanism can therefore provide an alternative explanation (to the effect of the E × B drifts analysed earlier) for the observed changes in target asymmetries associated with Bϕ reversal.

日本語訳

高リサイクリング・ダイバータプラズマの典型的な条件下では、イオン反磁性流がSOLにおけるイオンポロイダル回転に最も大きく寄与する。トロイダル効果により、SOLにおける正味のポロイダル回転は、トロイダル磁場(Bϕ)反転とともに反転する上下圧力非対称性によって維持されるイオン平行ピュルツァー・シュリューター流を生じさせる。上下圧力非対称性は、次に、トロイダル効果による局所反磁性電流 jr = (1/rB)(∂p/∂θ) の表面平均から生じる、正味の表面平均された径方向電流 r を生じさせる。径方向電流 r の径方向発散は、ターゲットとの電気的接触のためSOLに存在し得る。結果として生じる主プラズマ電流方向の正味のトロイダル r Bθ 力は、イオン反跳側(通常のBϕでは内側、反転Bϕプラズマでは外側)に有利な内外圧力非対称性を生じさせる。この圧力非対称性は、通常のBϕ放電では内側ダイバータ脚の高密度・低温プラズマをもたらし、反転Bϕ放電ではターゲット間の密度・温度分布をより均等にし、トロイダル磁場反転を伴う実験で観測される主な傾向と一致する。したがって、提案されたメカニズムは、Bϕ反転に伴うターゲット非対称性の観測された変化について、(先に解析されたE × B ドリフトの効果に加えて)別の説明を提供し得る。

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