中国物理B ›› 2016, Vol. 25 ›› Issue (2): 25202-025202.doi: 10.1088/1674-1056/25/2/025202

• PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES • 上一篇    下一篇

Sheath structure in plasma with two species of positive ions and secondary electrons

Xiao-Yun Zhao(赵晓云), Nong Xiang(项农), Jing Ou(欧靖), De-Hui Li(李德徽), Bin-Bin Lin(林滨滨)   

  1. 1. Institute of Plasma Physics, Chinese Academy of Sciences (CAS), Hefei 230031, China;
    2. Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230031, China;
    3. School of Physics and Electronic Engineering, Fuyang Normal University, Fuyang 236037, China;
    4. China for Magnetic Fusion Theory, Chinese Academy of Sciences, Hefei 230031, China
  • 收稿日期:2015-07-29 修回日期:2015-10-14 出版日期:2016-02-05 发布日期:2016-02-05
  • 通讯作者: Nong Xiang E-mail:xiangn@ipp.ac.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11475220 and 11405208), the Program of Fusion Reactor Physics and Digital Tokamak with the CAS "One-Three-Five" Strategic Planning, the National ITER Program of China (Grant No. 2015GB101003), and the Higher Education Natural Science Research Project of Anhui Province, China (Grant No. 2015KJ009).

Sheath structure in plasma with two species of positive ions and secondary electrons

Xiao-Yun Zhao(赵晓云)1,2,3,4, Nong Xiang(项农)1,4, Jing Ou(欧靖)1,4, De-Hui Li(李德徽)1,4, Bin-Bin Lin(林滨滨)1,4   

  1. 1. Institute of Plasma Physics, Chinese Academy of Sciences (CAS), Hefei 230031, China;
    2. Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230031, China;
    3. School of Physics and Electronic Engineering, Fuyang Normal University, Fuyang 236037, China;
    4. China for Magnetic Fusion Theory, Chinese Academy of Sciences, Hefei 230031, China
  • Received:2015-07-29 Revised:2015-10-14 Online:2016-02-05 Published:2016-02-05
  • Contact: Nong Xiang E-mail:xiangn@ipp.ac.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11475220 and 11405208), the Program of Fusion Reactor Physics and Digital Tokamak with the CAS "One-Three-Five" Strategic Planning, the National ITER Program of China (Grant No. 2015GB101003), and the Higher Education Natural Science Research Project of Anhui Province, China (Grant No. 2015KJ009).

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摘要： The properties of a collisionless plasma sheath are investigated by using a fluid model in which two species of positive ions and secondary electrons are taken into account. It is shown that the positive ion speeds at the sheath edge increase with secondary electron emission (SEE) coefficient, and the sheath structure is affected by the interplay between the two species of positive ions and secondary electrons. The critical SEE coefficients and the sheath widths depend strongly on the positive ion charge number, mass and concentration in the cases with and without SEE. In addition, ion kinetic energy flux to the wall and the impact of positive ion species on secondary electron density at the sheath edge are also discussed.

关键词: sheath, two-ion-species plasma, secondary electron emission

Abstract: The properties of a collisionless plasma sheath are investigated by using a fluid model in which two species of positive ions and secondary electrons are taken into account. It is shown that the positive ion speeds at the sheath edge increase with secondary electron emission (SEE) coefficient, and the sheath structure is affected by the interplay between the two species of positive ions and secondary electrons. The critical SEE coefficients and the sheath widths depend strongly on the positive ion charge number, mass and concentration in the cases with and without SEE. In addition, ion kinetic energy flux to the wall and the impact of positive ion species on secondary electron density at the sheath edge are also discussed.

Key words: sheath, two-ion-species plasma, secondary electron emission

中图分类号:  (Plasma sheaths)

  • 52.40.Kh
52.30.Ex (Two-fluid and multi-fluid plasmas) 52.65.-y (Plasma simulation)