两种正离子对磁化等离子体鞘层中尘埃颗粒的影响  

Influence of Two Positive-Ion Species on Charging of Dust Grains in Magnetized Plasma Sheath

作　　者：赵晓云[1] 武山[1] 张开银[1] 

机构地区：[1]阜阳师范学院物理与电子科学学院,阜阳236037

出　　处：《真空科学与技术学报》2013年第4期346-350,共5页Chinese Journal of Vacuum Science and Technology

基　　金：国家自然科学基金资助项目(11104032);安徽省高等学校优秀青年人才基金资助项目(2012SQRL116);安徽省高校省级自然科学基金资助项目(KJ2011B120)

摘　　要：建立了包含两种不同种类正离子的磁化等离子体鞘层的流体模型,通过四阶龙格库塔法数值模拟了含有两种不同种类正离子对等离子体鞘层中尘埃粒子的影响。结果表明对于含有He+和Ar+的稳态等离子体来说,随着离子温度的升高和Ar+密度的增加,尘埃粒子充电所带电量越多;尘埃密度越高,其带电量越低。此外,对于带有一定负电的尘埃粒子来说,离子的温度、鞘边Ar+的含量以及鞘层中离子与中性粒子的碰撞对鞘层中尘埃粒子的密度和速度都产生一定的影响。The influence of the two different species of positive ions, He ~ and Ar~ , on the charge of the dust grains in the magnetized plasma sheath was modeled on the basis of fluid dynamics,and simulated in the fourth-order-Rung-Kut- ta method. The simulated results show that when it comes to the steady state plasma containing He＋ and Ar ~ ions, the in- creases of both the ion temperature and density of Ar~ ions result in an increased number of charged dust-grain, accompa- nied by an increase of the total charge on the dust. Moreover, the higher the dust grain density, the lower the total-charge on the dust grains. In the case of the dust grains with a given amount of negative charge, the impacts of the various fac- tors, including the ion temperature,ratio of He ~ and Ar ~ ions near the edge of the sheath,and collision between ions and electrically neutral particles, etc on the density and speed distributions of the dust grains in the sheath was tentatively dis- cussed.

关 键 词：等离子体鞘层 正离子 尘埃颗粒 密度分布 

分 类 号：O531[理学—等离子体物理]