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研究了托卡马克等离子体中极向旋转剪切对新经典电阻率梯度驱动湍流(RGDT)结构的影响,解析地计算了饱和湍流扩散系数,涨落水平和输运流与极向旋转剪切的依赖关系。结果表明,极向旋转剪切可以降低等离子体涨落水平从而抑制湍流。在强剪切极限(极向旋转剪切参数S_α》1/4)下,湍流扩散系数正比于(k_θV′_θ)~(-1/2),涨落水平正比于|k_θV′_θ|~(-2)。在弱剪切极限下(S_α《1/4),将重新得到Kwon的结果。
The influence of polar shear on the resistivity gradient driven turbulence (RGDT) structure in tokamak plasma was studied. The saturated turbulent diffusivity, the fluctuation level, the transport flow and the polar rotation shear Dependencies. The results show that polar shear can reduce the plasma fluctuation level and thus restrain turbulence. The turbulent diffusion coefficient is proportional to (k_θV’_θ) ~ (-1/2) at the strong shear limit (polar shear parameter S_α 1/4), and the fluctuation level is proportional to | k_θV’_θ | ~ ( -2). Under the weak shear limit (S_α "1/4), Kwon’s results will be retrieved.