Particle modelling of plasma confinement by a multipolar magnetic field
Particle modelling of plasma confinement by a multipolar magnetic field
复制标题
DOI：
10.1088/0022-3727/37/13/011
复制
发表时间：
2003-10
期刊：
影响因子：
--
通讯作者：
H. Takekida;K. Nanbu
中科院分区：
文献类型：
--
作者：
H. Takekida;K. Nanbu
已知多极等离子体限制会导致等离子体密度增强、大体积均匀等离子体和静态等离子体。使用细胞内粒子/蒙特卡罗 (PIC/MC) 方法证实了多极磁场对直流放电的影响。气体为氩气。目前的PIC/MC模拟可以考虑三个作用：（1）两个磁极尖点附近的磁镜效应，（2）抑制电子在垂直于磁场线的方向上的扩散，以及（3）室壁上的鞘层中的电子排斥。对于我们的等离子体尺寸来说，磁场 |Bθ|max = 0.1 T 下的电子数密度比无磁场时的电子数密度高出九倍。当快电子的平均自由程等于或大于放电尺寸时，多极限制是有效的。为了给出磁体系统的设计标准，系统地研究了磁场、磁极数和气压对等离子体密度的影响。
Multipolar plasma confinement is known to result in enhanced plasma density, homogeneous plasma of a large volume, and quiescent plasmas. The effects of a multipolar magnetic field on the dc discharge are confirmed using the particle-in-cell/Monte Carlo (PIC/MC) method. The gas is argon. The present PIC/MC simulation made it possible to consider three roles: (1) magnetic mirror effect near the cusp of two magnetic poles, (2) suppressed electron diffusion in the direction normal to magnetic field line, and (3) electron repelling in the sheath on the chamber wall. Electron number density for the magnetic field |Bθ|max = 0.1 T is up to nine times higher than that for no field for our plasma dimensions. The multipolar confinement is effective when the mean free path of fast electrons is of the order or larger than the discharge size. In order to give design criteria of the magnet system, the effects of magnetic field, number of magnetic poles, and gas pressure on the plasma density are examined systematically.