Effects of Secondary Electron Emission Coefficient on the Plasma Wall Potential with Super-extensive Electrons

doi:10.19596/j.cnki.1001-246x.8611

Abstract

Abstract:

A one-dimensional model is used to study the effects of secondary electron emission coefficient on plasma wall potential with Maxwell distribution of primary electrons and partially super-extensive electrons. By numerical simulation, the results show that when the secondary electron emission coefficient of the wall is small, the wall potential decreases with the increase of the concentration ratio, the temperature ratio and super-extensive parameter of the super-extensive electrons to the primary electrons. The wall potential increases with the increase of the concentration ratio, the temperature ratio and super-extensive parameter of the super-extensive electrons to the primary electrons.

Key words: secondary electron emission, super-extensive, plasma, potential

Xiaoyun ZHAO, Bingkai ZHANG, Shigang LI, Yijia TANG. Effects of Secondary Electron Emission Coefficient on the Plasma Wall Potential with Super-extensive Electrons[J]. Chinese Journal of Computational Physics, 2023, 40(4): 482-489.

Figures/Tables 6

Fig.1 The schematic diagram of plasma sheath

Fig.2 The minimum ion Bohm velocity for different ratio of the number of super-extensive electrons to the number of primary electrons versus secondary electron emission coefficients

Fig.3 Wall potential for different super-extensive parameter q versus secondary electron emission coefficients

Fig.4 Wall potential for different ratio of the number of super-extensive electrons to the number of primary electrons versus secondary electron emission coefficients

Fig.5 The number density of secondary electrons for different ratio of the number of super-extensive electrons to the number of primary electrons versus secondary electron emission coefficients

Fig.6 Wall potential for different ration of the temperature of super-extensive electron to primary electron β versus secondary electron emission coefficients

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