分析了爆炸式發射的物理機理，在二維Yee網格模型的基礎上推導出了爆炸式發射的發射條件及逃離陰極表面的粒子電荷的計算公式，討論了在程序中如何用唯相的方法來描述爆炸式發射的二維粒子模擬實現過程，并以向內發射同軸二極管為例從其電流電壓關系及電子束運動特性方面驗證了模擬的正確性。
關 鍵 詞 爆炸式發射; 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