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Neoclassical plateau regime transport in a tokamak pedestal

Istvan Pusztai, Peter J Catto2010年Plasma Physics and Controlled FusionIF 2.2出版社

In tokamak pedestals with subsonic flows the radial scale of plasma profiles can be comparable to the ion poloidal Larmor radius, thereby making the radial electrostatic field so strong that the E × B drift has to be retained in the ion kinetic equation in the same order as the parallel streaming. The modifications of neoclassical plateau regime transport—such as the ion heat flux and the poloidal ion and impurity flows—are evaluated in the presence of a strong radial electric field. The altered poloidal ion flow can lead to a significant increase in the bootstrap current in the pedestal where the spatial profile variation is strong because of the enhanced coefficient of the ion temperature gradient term near the electric field minimum. Unlike the banana regime, orbit squeezing does not affect the plateau regime results.

日本語訳

トカマク周辺部において、亜音速流を伴う場合、プラズマ分布の動径方向スケールはイオンのポロイダル・ラーモア半径と同程度になり得る。そのため、径方向電場が非常に強くなり、イオン運動方程式においてE×Bドリフトを平行方向の流れと同じ次数で考慮する必要が生じる。強い径方向電場の存在下での新古典論的プラトー領域輸送の修正—例えばイオン熱流束やポロイダル方向のイオン流・不純物流—が評価される。分布の空間変化が強い周辺部では、電場最小値付近でのイオン温度勾配項の係数が増大するため、修正されたポロイダル方向のイオン流は自発電流(ブートストラップ電流)の顕著な増大をもたらし得る。バナナ領域とは異なり、軌道圧縮効果はプラトー領域の結果には影響を及ぼさない。

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