Hybrid approach to the ion drag force
Hybrid approach to the ion drag force
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DOI：
10.1063/1.1867995
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发表时间：
2005-03
影响因子：
2.2
通讯作者：
S. Khrapak;A. Ivlev;S. Zhdanov;G. Morfill
中科院分区：
文献类型：
--
作者：
S. Khrapak;A. Ivlev;S. Zhdanov;G. Morfill
本文详细计算了任意离子流速度下无碰撞麦克斯韦等离子体中作用在单个颗粒上的离子阻力。传统的二元碰撞方法与线性动力学形式相结合。结果表明，对于点状粒子，只要选择合适的有效等离子体筛选长度，二元碰撞法可以得到正确的结果。正确的选择来自自洽动力学理论。另一方面，二元碰撞方法一致地考虑了有限晶粒尺寸和颗粒充装量的影响。考虑到这些影响，得到了离子阻力的表达式。对一组典型的（示例性的）复杂等离子体参数进行了计算。简要地讨论了最近复杂等离子体实验的相关性。
A detailed calculation of the ion drag force acting on a single grain in a collisionless Maxwellian plasma with an arbitrary velocity of the ion flow is carried out. The traditional binary collision approach to the problem is combined with the linear kinetic formalism. It is shown that for a pointlike particle the binary collision approach yields correct results provided that the effective plasma screening length is chosen appropriately. The correct choice follows from the self-consistent kinetic theory. On the other hand, the binary collision approach accounts consistently for the effects of finite grain size and grain charging. Taking these effects into account an expression for the ion drag force is obtained. Calculations are performed for a typical (exemplary) set of complex plasma parameters. The relevance for recent complex plasma experiments is briefly discussed.