二次电子发射系数对含有超广延分布电子的等离子体器壁电势的影响

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

摘要/Abstract

摘要：

采用一维模型研究本底电子为麦氏分布的等离子体中存在部分超广延分布的高温电子情况下的二次电子发射系数对器壁电势的影响。数值模拟结果表明: 当器壁二次电子发射系数较小时, 器壁电势随着超广延分布电子与本底电子的浓度比值、温度比值、以及超广延参量这些参数的增加而减小; 当器壁二次电子发射系数较大时, 器壁电势则随着超广延分布电子与本底电子的浓度比值、温度比值、以及超广延参量值的增加而增加。

关键词: 二次电子发射, 超广延, 等离子体, 电势

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

赵晓云, 张丙开, 李世刚, 唐义甲. 二次电子发射系数对含有超广延分布电子的等离子体器壁电势的影响[J]. 计算物理, 2023, 40(4): 482-489.

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.

图/表 6

图1 等离子体鞘层示意图

Fig.1 The schematic diagram of plasma sheath

图2 超广延电子数与本底电子数所占比值α不同时离子玻姆速度最小值Mi随二次电子发射系数γ的变化

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

图3 超广延性参量q不同时器壁电势φw随二次电子发射系数γ的变化

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

图4 超广延电子数与本底电子数所占比值不同时器壁电势φw随二次电子发射系数γ的变化

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

图5 超广延电子数与本底电子数所占比值不同时器壁发射二次电子数密度随二次电子发射系数γ的变化

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

图6 超广延性分布电子温度与本底电子温度比值βh不同时器壁电势φw随二次电子发射系数γ的变化

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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