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

doi:10.1088/1674-1056/20/12/125201

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.

Keywords: saturated sheath conductivity current

Received: 19 September 2011
Revised: 12 October 2011
Accepted manuscript online:

PACS:	52.40.Kh	(Plasma sheaths)
	94.30.cj	(Magnetosheath)

Fund: 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).

Cite this article:

Zhang Feng-Kui(张凤奎), Ding Yong-Jie(丁永杰), Qing Shao-Wei(卿绍伟), and Wu Xian-De(吴限德) Near-wall conductivity effect under a space–charge-saturated sheath in the Hall thruster 2011 Chin. Phys. B 20 125201

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

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