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Ning G.,Science and Technology on Vacuum and Cryogenics Technology and Physics Laboratory | Liqiu W.,Harbin Institute of Technology | Yongjie D.,Harbin Institute of Technology
Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films | Year: 2014

The low-frequency oscillation characteristics of a Hall thruster were investigated by varying the dielectric wall temperature. Experimental results indicate that increasing the dielectric wall temperature can result in an increase in the amplitude of low-frequency oscillation and a slight decrease in its frequency. Physical analysis revealed that this change is related to the secondary electron emissions at different dielectric wall temperatures. The evidence suggests that this technique can serve as an effective way for future studies to examine how secondary electron emissions affect a discharging thruster. © 2014 American Vacuum Society. Source


Wei L.-Q.,Harbin Institute of Technology | Han L.,Harbin Institute of Technology | Yu D.-R.,Harbin Institute of Technology | Guo N.,Science and Technology on Vacuum and Cryogenics Technology and Physics Laboratory
Chinese Physics B | Year: 2015

In this paper, we summarize the research development of low-frequency oscillations in the last few decades. The findings of physical mechanism, characteristics and stabilizing methods of low-frequency oscillations are discussed. It shows that it is unreasonable and incomplete to model an ionization region separately to analyze the physical mechanism of low-frequency oscillations. Electro-dynamics as well as the formation conditions of ionization distribution play an important role in characteristics and stabilizing of low-frequency oscillations. Understanding the physical mechanism and characteristics of low- frequency oscillations thoroughly and developing a feasible method stabilizing this instability are still important research subjects. © 2015 Chinese Physical Society and IOP Publishing Ltd. Source


Li K.,Lanzhou Institute of Physics | Li D.,Science and Technology on Vacuum and Cryogenics Technology and Physics Laboratory | Qin X.,Science and Technology on Vacuum and Cryogenics Technology and Physics Laboratory | Liu Q.,Performance Technology | Yang S.,Science and Technology on Vacuum and Cryogenics Technology and Physics Laboratory
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology | Year: 2013

The electrostatic discharge characteristics of the space solar arrays were experimentally simulated. The results show that the discharge depends on the space environment, temperature, and materials of the solar array to a varying degree. The electrostatic discharge characteristics of the space solar array, irradiated with an electron beam, including the discharge voltage, discharge current, and discharge number, were measured. The measured results show that the electrostatic energy, accumulated in charging the solar array, is responsible for the electrostatic discharge. When the charging voltage, across the cover-glass and solar array structure, exceeds the threshold voltage, the electrostatic discharge occurs, and depending on the different charging modes, the discharge on solar array surfaces can be either a dielectric or a metallic discharge. Source

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