Plasma simulation to analyze velocity distribution characteristics of pseudospark-sourced electron beam  

作　　者：Hai-Long Li Chen-Fei Hu Che Xu Yong Yin Bin Wang Lin Meng Mao-Yan Wang 李海龙;胡陈飞;徐彻;殷勇;王彬;蒙林;王茂琰(School of Electronic Science and Engineering,University of Electronic Science and Technology of China,Chengdu 610054,China;School of Physics,University of Electronic Science and Technology of China,Chengdu 610054,China)

机构地区：[1]School of Electronic Science and Engineering,University of Electronic Science and Technology of China,Chengdu 610054,China [2]School of Physics,University of Electronic Science and Technology of China,Chengdu 610054,China

出　　处：《Chinese Physics B》2020年第10期349-353,共5页中国物理B（英文版）

基　　金：Project supported by the Sichuan Science and Technology Program, China (Grant No. 2019YJ0188);the National Natural Science Foundation of China (Grant Nos. 61671116 and 11905026).

摘　　要：Pseudospark-sourced electron beam is a promising candidate for driving vacuum electronic devices to generate millimeter wave and terahertz wave radiation as it has a very high combined beam current density. However, the inherent velocity spread of the beam, which is difficult to measure in experiment, has a great influence on the operating frequency and efficiency of the vacuum electronic device. In this paper, the velocity distribution characteristics of the electron beam produced by a single-gap hollow cathode electron gun are numerically studied and a three-dimensional kinetic plasma simulation model of a single-gap hollow cathode electron gun is built by using particle in cell and Monte Carlo collision methods in Vorpal. Based on the simulation model, the time-dependent evolution of the plasma formation inside the hollow cathode and electron beam generation process are observed. It is demonstrated that the pseudospark-sourced electron beam has a relatively large velocity spread. The time-dependent velocity distribution of the beam is analyzed, and the dependence of the beam velocity distribution under various operating conditions such as anode–cathode potential difference, gas pressure, and cathode aperture size are also studied.

关 键 词：PSEUDOSPARK hollow cathode vacuum electronic devices DISCHARGE 

分 类 号：O462[理学—电子物理学]