爆炸式發(fā)射二極管的粒子模擬研究

分析了爆炸式發(fā)射的物理機(jī)理，在二維Yee網(wǎng)格模型的基礎(chǔ)上推導(dǎo)出了爆炸式發(fā)射的發(fā)射條件及逃離陰極表面的粒子電荷的計(jì)算公式，討論了在程序中如何用唯相的方法來(lái)描述爆炸式發(fā)射的二維粒子模擬實(shí)現(xiàn)過(guò)程，并以向內(nèi)發(fā)射同軸二極管為例從其電流電壓關(guān)系及電子束運(yùn)動(dòng)特性方面驗(yàn)證了模擬的正確性。
關(guān) 鍵 詞 爆炸式發(fā)射; 二極管; 粒子模擬; 擊穿

Abstract The physical mechanism of explosive emission was analyzed. The conditions of emission and the formula to calculate the charge that would be drawn away from the cathode surface were educed based on the Yee model. Especially, discuss how to use the way of phenomenological description to realize particle-in-cell simulation in two-dimensional of explosive emission. Inward-emitting coaxial diode was used as an example to validate the corrections of simulation from current-voltage correlation and characteristic of electron beam movement.
Key words explosive-emission; diode; particle-in-cell simulation; breakdown