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The effect of shear on turbulent diffusion in a microwave discharge plasma in a toroidal stellarator

V.S. Vojtsenya, A. Yu. Voloshko, V.M. Zalkind, S.I. Solodovchenko, V.P. Tarasenko, A.F. Stan'1977年被引用 12Nuclear FusionIF 3出版社

A toroidal ℓ = 3 stellarator with large shear (θmax < 0.25) is used to study the oscillations of a steady-state microwave discharge plasma, and the values of the correlation coefficient between density and electric field fluctuations and turbulent plasma fluxes are measured by the correlation method. It is shown that the oscillations observed are due to the drift-dissipative instability. The influence of shear on the amplitude of drift oscillations, on the cross-correlation coefficient and on the turbulent fluxes due to drift instabilities is analysed. A threshold value of shear (θcr ≈ 0.05) is found above which a substantial reduction in the oscillation level (⟨δne2⟨1/2/ne ∼θ−1.5) and in the magnitude of turbulent plasma fluxes ( ∼ θ−3) can be noted.

日本語訳

トロイダルℓ=3ステラレータ(大きなシアを持つ、θmax<0.25)を用いて、定常状態のマイクロ波放電プラズマの振動を研究し、密度と電場の揺らぎの間の相関係数および乱流プラズマフラックスの値を、相関法によって測定した。観測された振動は、ドリフト・散逸性不安定性によるものであることが示された。ドリフト振動の振幅、相関係数、およびドリフト不安定性による乱流フラックスに対するシアの影響を解析した。シアの閾値(θcr≈0.05)が存在し、これを超えると、振動レベルの大幅な低減(⟨δne2⟨1/2/ne ∼θ−1.5)および乱流プラズマフラックスの大きさの大幅な低減(∼θ−3)が認められることが見出された。

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