Ricci Paolo, Rogers B N, Dorland W
Department of Physics and Astronomy, Dartmouth College, Hanover, New Hampshire 03755, USA.
Phys Rev Lett. 2006 Dec 15;97(24):245001. doi: 10.1103/PhysRevLett.97.245001.
Plasma turbulence due to small-scale entropy modes is studied with gyrokinetic simulations in a simple closed-field-line geometry, the Z pinch, in low-beta parameter regimes that are stable to ideal interchange modes. We find an enormous variation in the nonlinear dynamics and particle transport as a function of two main parameters, the density gradient and the plasma collisionality. This variation is explained in part by the damping and stability properties of spontaneously formed zonal flows in the system. As in toroidal systems, the zonal flows can lead to a strong nonlinear suppression of transport below a critical gradient that is determined by the stability of the zonal flows.
在低β参数区域且对理想互换模稳定的简单闭合磁力线几何结构——Z箍缩中，利用回旋动理学模拟研究了由小尺度熵模引起的等离子体湍流。我们发现，作为两个主要参数（密度梯度和等离子体碰撞率）的函数，非线性动力学和粒子输运存在巨大变化。这种变化部分是由系统中自发形成的带状流的阻尼和稳定性特性所解释的。与环形系统一样，带状流可导致在由带状流稳定性决定的临界梯度以下对输运产生强烈的非线性抑制。
