尘埃颗粒与等离子体鞘层相互作用的数值模拟  

Numerical simulation of the interaction between dust particles and plasma sheath

作　　者：吴静[1] 张鹏云[1] 王德真[1] 

机构地区：[1]大连理工大学物理与光电工程学院,三束材料改性国家重点实验室,大连116024

出　　处：《核聚变与等离子体物理》2008年第1期40-44,共5页Nuclear Fusion and Plasma Physics

基　　金：国家自然科学基金资助项目(10505005)

摘　　要：通过求解一维稳态的尘埃等离子体鞘层模型,得到了等离子体鞘层势、正离子密度、电子密度和尘埃颗粒密度随一维横向的分布,Bohm判据及鞘层边界无量纲Bohm速度随尘埃密度的变化曲线,尘埃颗粒的带电量和尘埃密度的关系,尘埃颗粒的温度对尘埃颗粒自身在鞘层中分布的影响。结果表明,随着尘埃密度的增加,鞘层的厚度在减小,鞘层内的电子密度在下降,而且尘埃颗粒的带电量也在逐渐减少;随着尘埃温度的增加,鞘层的厚度减小,电子密度下降,而且鞘层附近的尘埃颗粒在逐渐增多。Through the solution of the one-dimension steady dust plasma sheath model, more information of the dust plasma can be gained as follows： the sheath potential, the positive ion density, the electron density, and the dust particles density distributions in the sheath; the Bohm criterion and the Bohm velocity in the sheath boundary as a function of dust particle density; the relationship between dust particle charge and density; and the effect of dust particle temperature on its distribution in the sheath boundary. The results show that with the increase of dust particle density the plasma sheath thickness, electron density, dust particle charge decrease; and with the increase of dust particle temperature the dust particles density near the sheath boundary increase gradually.

关 键 词：鞘层 尘埃颗粒 密度分布 

分 类 号：O53[理学—等离子体物理]