Magnetic fluctuations, ambipolarity, charge filamentation, and plasma rotation in tokamaks
Magnetic fluctuations, ambipolarity, charge filamentation, and plasma rotation in tokamaks
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托卡马克中的磁波动、双极性、电荷丝化和等离子体旋转
DOI：
10.1063/1.863865
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发表时间：
1982
影响因子：
4.6
通讯作者：
R. Waltz
中科院分区：
文献类型：
--
作者：
R. Waltz
使用准线性动力学理论的运输，它表明，与传统的描述相反，由于当地的正常模式的磁波动的粒子流本质上是双极性的空间平均。这基本上是由于在垂直于磁场的方向上的局部坐标系旋转不变性。局部场扰动不携带来自等离子体的旋转动量，并且旋转只能通过缓慢的粘性扩散而丢失。虽然等离子体避免了快速的全局充电，但与双极性的局部偏差会导致向内和向外的径向电流流动，从而导致等离子体的电荷迁移。当与剪切粘度平衡时，澄清过程可以饱和。横向E×B速度中的电荷细丝和相应的剪切可能足够大，导致漂移和剪切阿尔芬模式成为开尔文-亥姆霍兹不稳定。这些影响与漂移阿尔芬模式方程的数值解说明…
Using the quasilinear kinetic theory of transport, it is shown that, contrary to the conventional description, the particle flow from magnetic fluctuations due to local normal modes is intrinsically ambipolar on spatial average. This follows essentially from the local frame rotational invariance in the direction perpendicular to the magnetic field. The local field perturbations carry no rotational momentum from the plasma, and rotation can be lost only by slow viscous diffusion. While the plasma avoids rapid global charge‐up, local deviations from ambipolarity cause both inward and outward radial electric currents to flow, resulting in charge filamentation of the plasma. The filamentation process can be saturated when balanced against shear viscosity. The charge filaments and corresponding shear in the transverse E×B velocity could be large enough to cause drift‐ and shear‐Alfven modes to be Kelvin–Helmholtz unstable. These effects are illustrated with numerical solutions of the drift‐Alfven mode equation...