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	真空二极管阴极表面场致发射模型的研究
	左应红 ; 王建国 ; 范如玉 ; Zuo Yinghong ; Wang Jianguo ; Fan Ruyu
	2016-03-30 ; 2016-03-30
关键词	真空二极管 场致发射模型 高斯定理 有限差分 阴极表面电场 Vacuum diode Field emission model Gauss' s law Finite difference Cathode surface electric field TN111
其他题名	Modeling and Simulation of Field Emission from Cathode Surface of Vacuum Diodes
中文摘要	为研究真空二极管阴极表面场致发射模型的算法及数值模拟参数对场致发射过程的影响,建立了计算阴极表面电场强度的有限差分近似模型和高斯定理模型,并基于高斯定理模型自行编程对不同间隙距离的二极管进行模拟计算。模拟得到了场致发射过程中阴极表面电场随时间的演变特性及阴极表面稳态电场与外加电场之间的关系,还将阴极表面稳态电场的模拟结果与理论分析结果进行了对比。研究结果表明,空间网格划分数目的多寡对基于高斯定理场致发射模型计算得到的阴极表面电场的影响不大;每个宏电子包含真实电子的数目、二极管间隙距离、二极管外加电场强度等参数均会对数值模拟结果产生显著影响。; Field emission from the cathode surfaces of vacuum diodes was modeled on the basis of Gaussian's law,and simulated in finite difference method. The influence of the gap distance in a vacuum diode on the field distribution,particularly on the cathode surfaces,was calculated with a self-developed code. The time evolution of the electric field on cathode surfaces and the impact of external field on the steady electric field of cathode surfaces were evaluated. The simulated results show that the accuracy of the simulation significantly depends on the number of real electrons in a"super-electron",gap distance of vacuum diode,and external field,and that the number of grid little affects the surface potential of cathode calculated in Gaussian's law. In addition,the steady electric field on cathode surfaces was theoretically calculated and simulated in particle-in-cell method,and both results show that the newly-developed finite difference simulation provides a better solution.
语种	中文 ; 中文
内容类型	期刊论文
源URL	[http://ir.lib.tsinghua.edu.cn/ir/item.do?handle=123456789/143163]
专题	清华大学
推荐引用方式 GB/T 7714	左应红,王建国,范如玉,等. 真空二极管阴极表面场致发射模型的研究[J],2016, 2016.
APA	左应红,王建国,范如玉,Zuo Yinghong,Wang Jianguo,&Fan Ruyu.(2016).真空二极管阴极表面场致发射模型的研究..
MLA	左应红,et al."真空二极管阴极表面场致发射模型的研究".(2016).

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