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Comments on `Toroidicity in the tokamak SOL: effects on poloidal asymmetries, radial current and L-H transition', by A V Chankin and P C Stangeby, Plasma Physics and Controlled Fusion, 38 (1996) 1879-1903

A V Chankin, P C Stangeby1999年Plasma Physics and Controlled FusionIF 2.2出版社

The problem of radial conductivity in the tokamak SOL is addressed with the specific objective of rectifying the recent paper of Rozhansky and Tendler on this subject. It is demonstrated that the presence of turbulence in the magnetic pre-sheath does not, in fact, affect the main conclusion of the previous paper by Chankin and Stangeby: that, regardless of how the pressure is distributed poloidally in the SOL and, in particular, regardless of how the pressure drop towards the target is sub-divided between the main SOL and the MPS, the radial current in the SOL should be zero in cylindrical geometry. It is stressed that either direct anomalous radial conductivity, or possibly strong parallel viscous shear stress and neutral friction, together with the effects of toroidal geometry are necessary to explain experimentally measured radial conductivity.

日本語訳

トカマクのスクレイプオフ層(SOL)における径方向コンダクティビティの問題を、このテーマに関するRozhanskyとTendlerの最近の論文を修正することを具体的な目的として取り扱う。磁気プレシース内の乱流の存在は、実際には、ChankinとStangebyによる以前の論文の主要な結論に影響を与えないことが実証される。すなわち、SOL内で圧力がポロイダル方向にどのように分布しているかに関係なく、また特に、圧力降下がメインSOLと磁気プレシースの間でどのように分割されるかに関係なく、SOL内の径方向電流は円筒幾何学においてゼロであるべきである。実験的に測定された径方向コンダクティビティを説明するためには、直接的な異常径方向コンダクティビティ、あるいは可能性として強い平行粘性応力と中性粒子摩擦が、トロイダル幾何学の効果とともに必要であることが強調される。

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Scrape-off layerL-H transition
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