Dynamics of fine particles in magnetized plasmas
Dynamics of fine particles in magnetized plasmas
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DOI：
10.1063/1.1342229
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发表时间：
2001-05-01
影响因子：
2.2
通讯作者：
Iizuka, S
中科院分区：
文献类型：
--
作者：
Sato, N;Uchida, G;Iizuka, S
这里介绍了在垂直磁场下低压弱电离等离子体中悬浮细颗粒的实验。磁场可用于提供细颗粒云的垂直长圆柱柱，在双等离子体配置下产生均匀的线状垂直排列的细颗粒。测量表明，即使在正离子被轻微磁化的弱磁场中，细颗粒云也会在水平面上沿方位角方向旋转。随着磁场的增加，转速增加，随后饱和。旋转速度和方向可以通过改变径向等离子体电势和/或密度分布来控制。旋转是在颗粒间距离足够小、细颗粒之间存在强库仑耦合的条件下引起的。旋转的机制可以通过离子运动对细颗粒的影响来解释，这些颗粒在垂直磁场的存在下会发生改变。 (C) 2001 年美国物理研究所。
Here are presented experiments on fine particles levitating in low-pressure weakly ionized plasmas under a vertical magnetic field. The magnetic field is useful to provide a vertically long cylindrical column of fine-particle clouds, yielding even string-shaped vertically aligned fine particles, under the double-plasma configuration. Measurements show that fine-particle clouds rotate in the azimuthal direction on the horizontal plane even in such a weak magnetic field that positive ions are slightly magnetized. With an increase of the magnetic field, the rotation speed increases, being followed by subsequent saturation. The rotation speed and direction can be controlled by varying radial plasma potential and/or density profiles. The rotation is induced under the condition that the interparticle distance is small enough for the strong Coulomb coupling among fine particles. A mechanism of the rotation could be explained by effects of ion motions on fine particles, which are modified in the presence of the vertical magnetic field. (C) 2001 American Institute of Physics.