中国物理B ›› 1996, Vol. 5 ›› Issue (2): 90-99.doi: 10.1088/1004-423X/5/2/002

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

ELECTRON DIFFUSION IN A NON-UNIFORM ELECTRIC FIELD AND A UNIFORM MAGNETIC FIELD

魏合林1, 刘祖黎1, 郁伯铭1, 李再光2   

  1. (1)Department of Physics, Huazhong University of Science and Technology, Wuhan 4300074, China; (2)Stale Key Laboratory of Laser Technology, Huazhong University of Science and Technology, Wuhan 430074, China
  • 收稿日期:1994-11-11 出版日期:1996-02-20 发布日期:1996-02-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China.

ELECTRON DIFFUSION IN A NON-UNIFORM ELECTRIC FIELD AND A UNIFORM MAGNETIC FIELD

WEI HE-LIN (魏合林)a, LIU ZU-LI (刘祖黎)a, YU BO-MING (郁伯铭)a, LI ZAI-GUANG (李再光)b   

  1. a Department of Physics, Huazhong University of Science and Technology, Wuhan 4300074, China; b Stale Key Laboratory of Laser Technology, Huazhong University of Science and Technology, Wuhan 430074, China
  • Received:1994-11-11 Online:1996-02-20 Published:1996-02-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China.

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摘要： A Monte Carlo simulation technique has been used to model the electron transport beharlot, especially the electron diffusion motion, in the cathode fall region of a glow discharge under the influence of a non-uniform electric field and a transverse magnetic field perpen-dicular to the cathode sheath electric field. Three types of collisions (elastic, excitation and ionization) are taken into account in our model. The electron free flying time is determined by the electron-neutral atom collision frequency. We focus attention on the electron diffusion distance and velocity. The electron-neutral atom collision processes and the electron drift velocity are also studied. The results indicate that with the increase of the magnetic field the electron diffusion distance increases and the electron diffusion velocity decreases. The results Mso show that the collision processes are enhanced by the magnetic field, this is in agreement with the experimental result. However, the axial magnetic field does not affect the electron transport behavior.

Abstract: A Monte Carlo simulation technique has been used to model the electron transport beharlot, especially the electron diffusion motion, in the cathode fall region of a glow discharge under the influence of a non-uniform electric field and a transverse magnetic field perpen-dicular to the cathode sheath electric field. Three types of collisions (elastic, excitation and ionization) are taken into account in our model. The electron free flying time is determined by the electron-neutral atom collision frequency. We focus attention on the electron diffusion distance and velocity. The electron-neutral atom collision processes and the electron drift velocity are also studied. The results indicate that with the increase of the magnetic field the electron diffusion distance increases and the electron diffusion velocity decreases. The results Mso show that the collision processes are enhanced by the magnetic field, this is in agreement with the experimental result. However, the axial magnetic field does not affect the electron transport behavior.

中图分类号:  (Glow; corona)

  • 52.80.Hc
52.25.Fi (Transport properties) 52.40.Kh (Plasma sheaths) 52.20.Hv (Atomic, molecular, ion, and heavy-particle collisions) 52.20.Fs (Electron collisions)