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Nonlocal behaviour of zonal flows in tokamak plasmas

机译：托卡马克等离子体中纬向流的非局部行为

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Oscillatory zonal flows called geodesic acoustic modes (GAMs) appearing in a high safety factor region of tokamak plasmas show nonlocal behaviour in their frequency. The frequency of the GAMs is unchanged over a certain radial region and the radial variation of the frequency is step-like. The effects of rho(*) = rho(i)/a on the nonlocal behaviour of the GAMs are investigated by global ion temperature gradient driven turbulence simulations, where rho(i) is an ion Larmor radius and a is a minor radius of a torus. It is found that the radial width in which the GAMs have the same frequency is almost proportional to root rho(i)a, while the radial wavelength of the GAMs is proportional to rho(i). As for turbulent transport, the boundary between a high transport region where the GAMs are dominant and a low transport region becomes clearer for smaller rho(*).
机译：在托卡马克等离子体的高安全系数区域中出现的称为测地声模（GAM）的振荡地带流在其频率上显示出非局部行为。 GAM的频率在一定的径向区域内不变，并且频率的径向变化呈阶梯状。通过全局离子温度梯度驱动的湍流模拟研究了rho（*）= rho（i）/ a对GAM的非局部行为的影响，其中rho（i）是离子拉莫尔半径，a是a的次半径圆环面。发现GAM具有相同频率的径向宽度几乎与根rho（i）a成正比，而GAM的径向波长与rho（i）成正比。至于湍流传输，对于较小的rho（*），GAM占主导的高传输区域和低传输区域之间的边界变得更加清晰。

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