Fluid Approximation of the Bohm Criterium for Plasmas of Several Ion Species
Fluid Approximation of the Bohm Criterium for Plasmas of Several Ion Species
复制标题
DOI：
10.1002/ctpp.2150340208
复制
发表时间：
1994
影响因子：
1.6
通讯作者：
M. Tokar
中科院分区：
文献类型：
--
作者：
M. Tokar
2. 基本方程。对于感兴趣的等离子体参数——鞘层宽度，是德拜长度，远小于带电粒子相互碰撞和它们与中性粒子碰撞之间的特征路径长度。我们考虑磁场垂直于等离子体边界表面的最简单情况。在这种情况下，在鞘层中只有向表面方向I的参数变化是重要的。带电物质j的行为由以下分布函数fi （l, v,, l）的动力学方程描述：其中vI和vL是沿和垂直于方向的速度分量，I， zi和mi是粒子的电荷和质量，E是电场。我们假设fi接近移位的麦克斯韦分布：
2. Basic equation. For the plasma parameters of interest-the sheath width, being of the Debye length, is much smaller than the characteristic path lengths between mutual collisions of charged particles and their collisions with neutrals. We consider the simplest situation of the magnetic field perpendicular to the surface bounded the plasma. In such a case only the change of parameters in the direction I towards the surface is of importance in the sheath. The behaviour of the charged species j is described by the following kinetic equation for the distribution function fi (l, v,, L 1: where vI and vL are the velocity components along and perpendicular to the direction I, zi and mi are the charge and mass of particles and E, is the electric field. We assume that fi is close to a shifted Maxwellian distribution: