物理学报2012，Vol.61Issue(17)：525-531,7.
爆炸电子发射初期阴极表面电场的研究
Investigation of the cathode electric field at the initial stage of explosive electron emission
摘要
Abstract
To investigate a complex physical phenomenon and its evolution law at the cathode surface at the initial stage of the explosive electron emission process in a high-power diode, in this paper we present a model of a planar vacuum diode with a field emission cathode. The model is one-dimensional and nonstationary. To study the space charge effect of the emitted electrons on the electric field at the cathode surface, Poisson＇s equation is solved numerically by using our developed code, and the time-dependences of the electric field at the cathode surface for different cases are obtained. The results show that the electric field at the cathode surface first oscillates and finally yields a steady state. The absolute value of the steady electric field at the cathode surface is higher for the higher field enhancement factor at a given applied electric field, and the applied electric field has the same effects on the steady value at a certain field enhancement factor. The electric field at the cathode surface completely determines the extracted field emission current density from the cathode, and at the same time, the electric field at the cathode surface is influenced by the emitting current density.关键词
场致发射/空间电荷/电场/阴极表面Key words
field emission/space charge/electric field/cathode surface分类
数理科学引用本文复制引用
左应红,王建国,朱金辉,牛胜利,范如玉..爆炸电子发射初期阴极表面电场的研究[J].物理学报,2012,61(17):525-531,7.基金项目
国家高技术研究发展计划（863）资助的课题 （）
