Effect of impurity ions on the surface potential of dust particles in fusion plasma

doi:10.16568/j.0254-6086.202002004

Abstract

Abstract:

The influence of multi-charged positive ions on charging process of dust particles and the surface potential in charge balance are discussed with the orbit motion limited theory in fusion plasma. It is shown that the greater the concentration is, the more the charge number is and the greater the mass of other positive ions is in hydrogen plasma, the more negative charges the dust particles carry rapidly during charging, and the greater electron negativity the dust particles have in the charge balance. In addition, the surface potential of dust particles is negatively linear correlated with the concentration of other multi-charged positive ions in the hydrogen plasma. The presence of multi-charged positive ions also affects the extreme value of the surface potential of the dust particles with the change of the hydrogen ion temperature.

Key words: Dust, Plasma, Positive ions, Charging equation

摘要：

用粒子轨道理论研究了多电荷正离子对聚变等离子体中尘埃颗粒充电过程以及充电平衡时表面电势的影响。模拟结果表明，在氢等离子体中，多电荷正离子的浓度越大、电荷数越多以及离子质量数越大，都将使得尘埃颗粒在充电过程中迅速携带较多的负电荷，且充电平衡时具有更大的负电性。此外，充电平衡时，尘埃颗粒表面电势与氢等离子体中另一种多电荷正离子的浓度呈负线性相关，多电荷正离子对随氢离子温度变化的尘埃颗粒表面势的极值也产生影响。

关键词: 尘埃, 等离子体, 正离子, 充电方程

CLC Number:

O539

TANG Yi-jia, ZHAO Xiao-yun, WANG Chun-xiao. Effect of impurity ions on the surface potential of dust particles in fusion plasma[J]. NUCLEAR FUSION AND PLASMA PHYSICS, 2020, 40(2): 117-123.

唐义甲，赵晓云，王春晓. 聚变等离子体中杂质离子对尘埃颗粒电势的影响[J]. 核聚变与等离子体物理, 2020, 40(2): 117-123.

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