Emission models for thermionic cathodes

被引：0
|
作者：
Carpenter, DC
Simkin, J
机构：
来源：
CHARGED PARTICLE OPTICS III | 1997年 / 3155卷
关键词：
computer simulation; thermionic cathode; thermionic emission; electrostatic fields; electron gun; finite element method; computer modeling; space charge; beam modeling;
D O I：
10.1117/12.279397
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Accurate computer simulations of electron guns based on finite element methods for electrostatic field calculation are described Discrete and semi analytic models for thermionic cathode emission currents are presented, the initial. conditions used for the electrons at the cathode are discussed and the affects of different approximations are analyzed for an axisymmetric triode electron gun. Results from models that use local one dimensional approximations are compared to a full discrete simulation.
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页码：14 / 20
页数：7
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