电场
空间电荷
微尺度化学
二次排放
电子
场电子发射
原子物理学
化学
领域(数学)
气体放电
工作职能
计算物理学
物理
电极
数学教育
量子力学
物理化学
数学
纯数学
作者
Chubin Lin,Jiandong Chen,Asif Iqbal,Peng Zhang,Yangyang Fu
摘要
A dimensional method was employed to evaluate the microscale gas breakdown characteristics at atmospheric pressure, resulting in a universal breakdown curve applicable to different types of gases (e.g., Ar, Xe, Ne, and N2). As the gap distance decreases, the breakdown mode transitions from ion-induced secondary electron emission to the field emission regime. In the field emission regime, the positive space charge effect becomes more significant. We discovered that incorporating the positive space charge effect in the field emission regime can be achieved by modifying the local electric field enhancement factor β. Consequently, we propose an effective electric field enhancement factor, βeff, which scales linearly with β, to accurately reproduce the breakdown curve while considering the positive space charge effect. This proposed approach significantly simplifies the numerical model. Additionally, we examined the effects of gas pressure, gap distance, cathode properties (e.g., work function and secondary electron emission coefficient), and electric field nonuniformity.
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