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Effects of neutral gas collisions on the conducting-wall instability

X Q Xu, R H Cohen1993年Plasma Physics and Controlled FusionIF 2.2出版社

The shallow angle of an oblique incidence of the magnetic field to the divertor plates (e.g. 1 degrees -3 degrees in in DIII-D) leads to a spatial extension of the sheath of the order of gyroradius (e.g. 0.3 mm) normal to the plate. Since the actual particle path along the field lines inside the sheath is around 1 cm, ionization processes within the sheath become important and reduce the sheath potential. Ionization due to electron-neutral collisions can reduce the end-loss current of the divertor plasma, contributing to a stabilizing effect on the conducting wall-mode. Thus the neutral gas collisions can be used as a knob to control the conducting-wall-driven turbulence in the scrape-off layer (SOL) experimentally.

日本語訳

磁場の斜め入射がダイバータ板に対してなす浅い角度(例えばDIII-Dにおける1度〜3度)は、板に垂直な方向へのシースの空間的広がりをジャイロ半径程度(例えば0.3 mm)に拡張させる。シース内における磁力線に沿った実際の粒子経路は約1 cmであるため、シース内での電離過程が重要となり、シース電位を低下させる。電子と中性粒子の衝突による電離は、ダイバータプラズマの端損失電流を低減させ、導体壁モードに対する安定化効果に寄与する。したがって、中性粒子衝突は、スクレイプオフ層(SOL)における導体壁駆動乱流を実験的に制御するためのパラメータとして利用できる。

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diii-d低精度(概要文一致)
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