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
张凤奎1, 吴限德1, 丁永杰2, 卿绍伟2
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)
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.
中图分类号: (Plasma sheaths)