中国物理B ›› 2011, Vol. 20 ›› Issue (12): 125201-125201.doi: 10.1088/1674-1056/20/12/125201

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

Near-wall conductivity effect under a space–charge-saturated sheath in the Hall thruster

张凤奎1, 吴限德1, 丁永杰2, 卿绍伟2   

  1. (1)College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001, China; (2)HIT Plasma Propulsion Laboratory, Harbin Institute of Technology, Harbin 150001, China
  • 收稿日期:2011-09-19 修回日期:2011-10-12 出版日期:2011-12-15 发布日期:2011-12-15
  • 基金资助:
    Project supported by the Fundamental Research Funds for the Central Universities (Grant No. HEUCF100212) and the National Natural Science Foundation of China (Grant Nos. 51007013, 10875024, and 10975026).

Near-wall conductivity effect under a space–charge-saturated sheath in the Hall thruster

Zhang Feng-Kui(张凤奎)a)†, Ding Yong-Jie(丁永杰)b)‡, Qing Shao-Wei(卿绍伟)b), and Wu Xian-De(吴限德) a)   

  1. a College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001, China; b HIT Plasma Propulsion Laboratory, Harbin Institute of Technology, Harbin 150001, China
  • Received:2011-09-19 Revised:2011-10-12 Online:2011-12-15 Published:2011-12-15
  • Supported by:
    Project supported by the Fundamental Research Funds for the Central Universities (Grant No. HEUCF100212) and the National Natural Science Foundation of China (Grant Nos. 51007013, 10875024, and 10975026).

摘要: In this paper, we adopt the modified Morozov secondary electron emission model to investigate the influence of the characteristic of a space-charge-saturated sheath near the insulated wall of the Hall thruster on the near-wall conductivity, by the method of two-dimensional (2D) particle simulation (2D+3V). The results show that due to the sharp increase of collision frequency between the electrons and the wall under the space-charge-saturated sheath, the near-wall transport current under this sheath is remarkably higher than that under a classical sheath, and equals the near-wall transport current under a spatially oscillating sheath in order of magnitude. However, the transport currents under a space-charge-saturated sheath and a spatially oscillating sheath are different in mechanism, causing different current density distributions under the above two sheaths, and a great influence of channel width on the near-wall transport current under a space-charge-saturated sheath.

Abstract: In this paper, we adopt the modified Morozov secondary electron emission model to investigate the influence of the characteristic of a space-charge-saturated sheath near the insulated wall of the Hall thruster on the near-wall conductivity, by the method of two-dimensional (2D) particle simulation (2D+3V). The results show that due to the sharp increase of collision frequency between the electrons and the wall under the space-charge-saturated sheath, the near-wall transport current under this sheath is remarkably higher than that under a classical sheath, and equals the near-wall transport current under a spatially oscillating sheath in order of magnitude. However, the transport currents under a space-charge-saturated sheath and a spatially oscillating sheath are different in mechanism, causing different current density distributions under the above two sheaths, and a great influence of channel width on the near-wall transport current under a space-charge-saturated sheath.

Key words: saturated sheath, conductivity, current

中图分类号:  (Plasma sheaths)

  • 52.40.Kh
94.30.cj (Magnetosheath)