碰撞对两种正离子的电负性磁鞘影响的数值研究  

Numerical Study on Collision Effect in Magnetized Electronegative Plasma Sheath with Two Species of Positive Ions

作　　者：赵晓云[1] 张丙开[1] 武山[1] 李世刚[1] 

机构地区：[1]阜阳师范学院物理与电子科学学院,安徽阜阳236037

出　　处：《计算物理》2012年第6期859-866,共8页Chinese Journal of Computational Physics

基　　金：国家自然科学基金(11104032;11147134);安徽省高等学校优秀青年人才基金(2012SQRL116);安徽省高等学校省级自然科学基金(KJ2012Z305)资助项目

摘　　要：建立包括两种正离子的电负性磁鞘的流体模型,利用四阶龙格库塔法数值求解描述一维稳态等离子体鞘层的方程组,考察离子与中性粒子碰撞对一维稳态等离子体鞘层的影响.结果表明:鞘边Ar+与He+的含量比值与碰撞参数对离子马赫数的取值范围都有影响.鞘边负离子含量越少,碰撞对鞘层中带电粒子密度的影响越明显.并且随碰撞参数的加大,鞘层中电子、负离子的密度下降越快,两种正离子的密度则呈现不同的波动变化.鞘边负离子含量越多,碰撞对鞘层中两种正离子的速度影响就越明显.此外,碰撞参数越大对鞘边δ越大的鞘层中的带电粒子密度影响越大.A fluid model is developed in magnetized electronegative plasma sheath with two species of positive ions.It is shown that one-dimensional stationary plasma sheath is affected by ions-neutral collisions.The range of ion Mach numbers depends on density ratio of Ar＋ to He＋ and collision parameter.Collision effect on charge density in the sheath is obvious as density of negative ions is small.Density of electron and negative ion decreases quickly.Two kinds of positive ion density present different fluctuations.Collision effect on ion velocity distribution in the sheath is obvious as density of negative ions is great.In addition,collision paramete affects density distribution of charge particles clearly as density ratio of two species of positive ions is great.

关 键 词：等离子体 磁鞘 碰撞 玻姆判据 

分 类 号：O531[理学—等离子体物理]