阴极金属微凸起电场增强因子数值模拟
Numerical simulation of electric field enhancement factor of metallic microprotrusion
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摘要: 利用有限元方法对无穷大平板二极管中阴极表面金属微凸起的微观电场增强因子进行了计算研究，给出了微凸起微观电场增强因子随凸起参数的变化规律，拟合得到了微观电场增强因子的简单实用的经验表达式，并与文献中的近似公式进行了比较。模拟的结果表明，对锥状球头微凸起的电场增强因子，文献给出的近似公式误差较大，应避免使用。Abstract: Using the finite element method, a numerical study of the electric field enhancement factor of a metallic microprotrusion on the cathode surface of an infinite planar diode was presented. According to the numeral results, the relationship between the electric enhancement factors and the dimensions of microprotrusions with typical geometry was obtained, which was useful in the analysis of explosive electron emission.
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