托卡马克几何中漂移波与互换Turbulence：线性与非线性模式结构
Drift Wave versus Interchange Turbulence in Tokamak Geometry: Linear versus Nonlinear Mode Structure
摘要：
本文通过三维托卡马克通量管的计算，研究了一般E-cross-B漂移湍流中漂移波与交换物理的竞争。对于一组给定的背景尺度，参数空间可以覆盖的等离子体β和漂移波碰撞。在足够大的等离子体β湍流爆发成理想的气球模式和饱和，只有通过耗尽自由能的背景压力梯度。在高碰撞，它发现一个更渐进的过渡到电阻气球。在中等β和碰撞，它保留漂移波的字符，定性相同的简单的二维板模型。其根本原因是非线性涡度平流，通过这种非线性涡度平流，自持漂移波湍流取代了线性不稳定性，在线性不稳定性增长之前将它们分散开，从而将其自身的物理特性强加于动力学。这种涡度平流催化梯度驱动，而饱和仅通过压力扰动的湍流混合发生。这种情况持续在整个托卡马克边缘参数空间。本文讨论了简化的等温模型和完全的温离子模型。
英文摘要：
The competition between drift wave and interchange physics in general E-cross-B drift turbulence is studied with computations in three dimensional tokamak flux tube geometry. For a given set of background scales, the parameter space can be covered by the plasma beta and drift wave collisionality. At large enough plasma beta the turbulence breaks out into ideal ballooning modes and saturates only by depleting the free energy in the background pressure gradient. At high collisionality it finds a more gradual transition to resistive ballooning. At moderate beta and collisionality it retains drift wave character, qualitatively identical to simple two dimensional slab models. The underlying cause is the nonlinear vorticity advection through which the self sustained drift wave turbulence supersedes the linear instabilities, scattering them apart before they can grow, imposing its own physical character on the dynamics. This vorticity advection catalyses the gradient drive, while saturation occurs solely through turbulent mixing of pressure disturbances. This situation persists in the whole of tokamak edge parameter space. Both simplified isothermal models and complete warm ion models are treated.
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