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On the effects of nonuniform zonal flow in the resistive-drift plasma

Chang-Bae Kim, Byunghoon Min, Chan-Yong An2019年Plasma Physics and Controlled FusionIF 2.2出版社

We study the impact of the zonal-vorticity gradient (zonal-flow curvature) V'' by enforcing sinusoidally-varying zonal flow in the highly-adiabatic resistive-drift plasma. Initial small disturbance becomes linearly unstable and the fluctuating electric potential φ and the density n are found localized radially near the peak of positive V along the electron diamagnetic drift, irrespective of the amplitude of V. During the nonlinear phase of saturation, the turbulence sustains the localized state depending on the maximum positive V''. Where V < 0, the cross phase δ between φ and n is negative if the (positive) renormalized electron diamagnetic drift is slower than the (negative) curvature-induced advecting velocity, which is proportional to V''. Where δ < 0, the fluctuations are not driven excited and the turbulence level is low. As a result, the fluctuations are mostly localized around where V > 0 and maximum.

日本語訳

我々は、高断熱抵抗性ドリフトプラズマにおいて正弦波状に変化する帯状流を課すことにより、帯状渦度勾配(帯状流曲率)V''の影響を研究する。初期の小さな擾乱は線形的に不安定となり、変動する電位φと密度nは、Vの振幅に関係なく、電子反磁性ドリフトに沿った正のVのピーク付近に動径方向に局在することが見出される。飽和の非線形段階では、乱流は最大の正のV''に依存して局在状態を維持する。V < 0の場合、クロス位相δは、φとnの間で、もし(正の)繰り込み電子反磁性ドリフトがV''に比例する(負の)曲率誘起対流速度よりも遅ければ、負となる。δ < 0の場合、変動は励起されず、乱流レベルは低い。その結果、変動は主にV > 0かつ最大となる領域の周囲に局在する。

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