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Reduction of edge plasma turbulence via cross-phase decrease by zonal fields

Chang-Bae Kim, Chan-Yong An, Byunghoon Min2019年Plasma Physics and Controlled FusionIF 2.2出版社

Transport of the near-adiabatic plasma is simulated numerically. The zonal flow (ZF) V along the poloidal direction is found to emerge self-consistently from the non-zonal turbulence. Zonal fields are found to feed back to turbulence by reducing the cross phase. As a result the turbulence is localized with depressed peaks. Turbulence is very low and the cross phase δ is negative near V = 0, where the gradient (vorticity) of ZF along the radial direction is large. The fluctuations are almost localized where the zonal-density gradient is a positive peak and V is locally large. Positive or positive is shown to reduce the cross phase between the electric potential and the density fluctuation.

日本語訳

準断熱プラズマの輸送を数値シミュレーションした。ポロイダル方向の帯状流(ZF)Vが、非帯状乱流から自己無撞着に出現することが見出された。帯状場は、クロス位相を減少させることにより乱流にフィードバックすることが見出された。その結果、乱流は局在化し、ピークは抑制される。V=0の近傍では、乱流は非常に低く、クロス位相δは負であり、そこではZFの動径方向の勾配(渦度)が大きい。変動は、帯状密度勾配が正のピークを持ち、Vが局所的に大きい場所にほぼ局在する。正の または正の は、電位変動と密度変動の間のクロス位相を減少させることが示された。

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Edge plasmaZonal flowPlasma turbulence
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