三维热场致发射模型的数值模拟与研究

摘要

In this paper, we study the basic theory of field emission, thermionic emission and the thermal field emission, derive their current density formula, the initial distribution of the particles and their initial momentum. And then we achieve a field emission model, thermionic emission model and thermal field emission model on the basis of FDTD-PIC algorithm software. Finally, we verify its correctness using a wedge-shaped-cathode device.%研究了场致发射与热电子发射的基本理论，得出热场致发射的适用公式，探讨了其粒子的初始分布和初始动量，并在FDTD—PIC原理的基础上编写了软件，分别实现了场致发射模型，热电子发射模型和热场致发射模型，通过分别对一个长楔形阴极器件的数值模拟，从发射电流特性，电子初始能量分布等方面验证了其正确性．