Effects of collisions on dust particle in a dusty plasma sheath

Abstract

Abstract:

The fluid dynamics model was used to study the influence of the existence of the collisions on the dust particles in a dusty plasma sheath. The main collisions in this study consist of the ionization collision, the collision between electron and neutral particle, the collision between ion and neutral particle, the collision between electron and dust particle, the collision between ion and dust particle. Numerical calculation results are obtained by the fourth-order-Rung-Kutta method. It is shown that both the dust particles’ density and corresponding electricity quantity increase as the following collisions’ frequency enhances, such as ionization collision, the collision between electron and neutral particle, the collision between ion and neutral particle. The charge reduces due to the collisions concluding electron-dust particle and ion-dust particle. In addition, the effect produced by ions’ collision is much more obviously compared with electrons’ collision.

Key words: Plasma sheath, Collision, Dust particles, Density distribution

摘要：

在一维平板鞘层中应用流体模型研究了尘埃等离子体鞘层中碰撞对尘埃颗粒密度和带电量的影响。研究所涉及的碰撞主要有电离碰撞，电子、离子分别与中性粒子的碰撞，以及电子、离子分别与尘埃颗粒的碰撞。通过采用四阶龙格库塔法，得到了数值解。结果表明，随着电离碰撞或者电子、离子分别与中性粒子碰撞的频率增加，都将导致鞘层中尘埃颗粒的数密度增大，数密度的极值位置向鞘边位置靠近，尘埃颗粒带电量增多。电子、离子与尘埃颗粒的碰撞，使得尘埃带电量减小。此外，从研究的结果来看，由离子产生的碰撞要比电子产生的碰撞对尘埃颗粒的影响明显得多。

关键词: 等离子体鞘层, 碰撞, 尘埃颗粒, 密度分布

CLC Number:

O531

ZHAO Xiao-yun, ZHANG Bing-kai, ZHANG Kai-yin. Effects of collisions on dust particle in a dusty plasma sheath[J]. NUCLEAR FUSION AND PLASMA PHYSICS, 2014, 34(3): 207-213.

赵晓云，张丙开，张开银. 碰撞对尘埃等离子体鞘层中尘埃颗粒影响[J]. 核聚变与等离子体物理, 2014, 34(3): 207-213.

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