A collisional model of the plasma presheath
A collisional model of the plasma presheath
复制标题
等离子体预鞘的碰撞模型
DOI：
10.1063/1.866663
复制
发表时间：
1988
期刊：
影响因子：
--
通讯作者：
G. Emmert
中科院分区：
文献类型：
--
作者：
J. Scheuer;G. Emmert
用动力学方法研究了碰撞等离子体流入完全吸收壁的问题。假设等离子体具有非零离子温度和电子的玻尔兹曼分布。离子碰撞通过Bhatnagar-Gross-Krook （BGK）碰撞项包含在分析中。导出了描述鞘前区静电势变化的方程。该方程对一系列碰撞进行了数值求解。除计算鞘内电位变化外，还计算了鞘内离子分布函数、壁势以及进入鞘内的离子粒子和能量通量。对三种不同的情况重复计算。在第一种情况下，离子中性碰撞是通过只保留BGK算子中的粒子来模拟的。在第二种情况下，离子-离子碰撞是通过守恒粒子和动量来模拟的，在第三种情况下，是通过守恒粒子、动量和能量来模拟的。这些结果让我们深入了解……
The problem of a collisional plasma flowing into a perfectly absorbing wall has been investigated using a kinetic approach. The plasma is assumed to have a nonzero ion temperature and a Boltzmann distribution of electrons. Ion collisions are included in the analysis through a Bhatnagar–Gross–Krook (BGK) collision term. An equation describing the electrostatic potential variation in the presheath region is derived. This equation is solved numerically for a range of collisionalities. In addition to the potential variation in the presheath, the ion distribution function, the wall potential, and the ion particle and energy fluxes into the sheath are also calculated. The calculation is repeated for three different cases. In the first case ion–neutral collisions are modeled by conserving only particles in the BGK operator. Ion–ion collisions are modeled by conserving particles and momentum in the second case, and by conserving particles, momentum, and energy in the third case. These results give insight into th...