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Plasma fluctuations near the shear layer in the ATF torsatron

C. Hidalgo, J.H. Harris, T. Uckan, J.D. Bell, B.A. Carreras, J.L. Dunlap, G.R. Dyer, C.P. Ritz, A.J. Wootton, M.A. Meier1991年被引用 49Nuclear FusionIF 3出版社

Electrostatic turbulence has been investigated in the edge region of the Advanced Toroidal Facility (ATF). A reversal in the poloidal phase velocity of the fluctuations has been observed (velocity shear) which determines a characteristic plasma radius. The location of this shear layer depends on the magnetic configuration, the limiter radius and the plasma conditions. Using the shear position as a reference point, the density fluctuation levels in ATF (currentless stellarator) are very similar to those previously reported in TEXT (ohmically heated tokamak), suggesting that the plasma current is not an important drive for the edge turbulence. The drives for the turbulence appear to be different inside and outside the shear location (ashear), with e/Te < ñ/n in the scrape-off layer (r/ashear > 1) and possibly larger e/Te in the plasma edge edge (r/ashear < 1). There is a spatial decorrelation in the fluctuations at the shear location; this suggests that the poloidal shear flow has an important influence on the edge turbulence. The poloidal correlation length depends on local plasma parameters (e.g. velocity and temperature). When neutral beam injection is added, the high frequency components of ̃n increase.

日本語訳

先進トロイダル装置(ATF)の周辺領域において、静電乱流が調査された。変動のポロイダル位相速度の反転(速度シア)が観測され、これにより特徴的なプラズマ半径が決定される。このシア層の位置は、磁気配位、リミター半径、およびプラズマ条件に依存する。シア位置を基準点として用いると、ATF(無電流ステラレーター)における密度変動レベルは、以前にTEXT(オーム加熱トカマク)で報告されたものと非常に類似しており、プラズマ電流が周辺乱流の主要な駆動源ではないことを示唆している。乱流の駆動機構は、シア位置の内側と外側で異なっているようであり、スクレイプオフ層(r/ashear > 1)ではe/Te < ñ/nであり、プラズマ周辺部(r/ashear < 1)ではe/Teがおそらくより大きい。変動にはシア位置において空間的脱相関が見られ、これはポロイダルシア流が周辺乱流に重要な影響を及ぼしていることを示唆している。ポロイダル相関長は、局所的なプラズマパラメータ(例えば、速度と温度)に依存する。中性粒子ビーム入射を追加すると、ñの高周波成分が増加する。

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