现代应用物理2017，Vol.8Issue(1)：35-42,8.DOI:10.12061/j.issn.2095-6223.2017.010402
热场致电子发射阴极表面电场瞬态响应特性模拟
Numerical Simulation on Transient Time Response of Thermo-Field Electron Emission Cathode Surface Electric Field
摘要
Abstract
In order to investigate the complex and nonlinear space charge effects in thermo-field electron emission process,an electrostatic particle-in-cell simulation model for planar diode has been built based on the universal integral formulas of electron current density theory.In this model, the electron emission boundary condition is set as thermo-field electron emission, and transient time response curves of electric field strength on the thermo-field electron emission cathode surface have been obtained.The simulation results indicate that the electric field on the thermo-field electron emission cathode surface exhibits oscillating characteristic in ps time scale.The oscillating characteristic is affected by geometry parameters, such as gap distance, cathode material, work function, and operating parameters including applied electric field and cathode temperature.The electric field on the cathode surface will oscillate and get to a steady state, while for the steady electric field strength, the simulation results coincide well with the theoretical results.When the applied electric field strength and cathode temperature are determined, the larger the work function of cathode material is, the higher the steady electric field strength will be.When the cathode material and applied electric field strength are determined, the steady electric field strength shows a descending in non-linear form with increasing of the cathode temperature.关键词
热场致电子发射/阴极表面电场/瞬态响应/粒子模拟Key words
thermo-field electron emission/cathode surface electric field/transient response/particle in cell simulation分类
数理科学引用本文复制引用
左应红,朱金辉..热场致电子发射阴极表面电场瞬态响应特性模拟[J].现代应用物理,2017,8(1):35-42,8.基金项目
国家自然科学基金资助项目(61231003) （61231003）
