计算物理 ›› 2012, Vol. 29 ›› Issue (6): 859-866.

• 论文 • 上一篇    下一篇

碰撞对两种正离子的电负性磁鞘影响的数值研究

赵晓云, 张丙开, 武山, 李世刚   

  1. 阜阳师范学院物理与电子科学学院, 安徽 阜阳 236037
  • 收稿日期:2012-02-09 修回日期:2012-04-05 出版日期:2012-11-25 发布日期:2012-11-25
  • 作者简介:赵晓云(1977-),男,硕士,讲师,主要从事等离子体鞘层的理论研究,E-mail:fuyangzxy77@163.com
  • 基金资助:
    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

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

ZHAO Xiaoyun, ZHANG Bingkai, WU Shan, LI Shigang   

  1. School of Physics and Electronics, Fuyang Teachers College, Fuyang, Anhui 236037, China
  • Received:2012-02-09 Revised:2012-04-05 Online:2012-11-25 Published:2012-11-25

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.

关键词: 等离子体, 磁鞘, 碰撞, 玻姆判据

Abstract: 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 efkct 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 velocitv distribution in the sheath is obvious as density of negative ions is great. In addition,collision paramcte affects density distribution of charge particles clearly as density ratio of two species of positive ions is great.

Key words: plasma, magnetic sheath, collision, Bohm criterion

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