Impact of exterior electron emission on the self-sustaining margin of hollow cathode discharge
Impact of exterior electron emission on the self-sustaining margin of hollow cathode discharge作者机构:Harbin Institute of TechnologyHarbin 150001.People's Republic of China
出 版 物:《Plasma Science and Technology》 (等离子体科学和技术(英文版))
年 卷 期:2020年第22卷第9期
页 面:2-11页
核心收录:
学科分类:080703[工学-动力机械及工程] 08[工学] 082502[工学-航空宇航推进理论与工程] 0807[工学-动力工程及工程热物理] 0805[工学-材料科学与工程(可授工学、理学学位)] 0825[工学-航空宇航科学与技术] 0702[理学-物理学]
基 金:National Natural Science Foundation of China(Nos.61571166 and 51736003)for supporting the research
主 题:hollow cathode self-sustained discharge secondary electron emission ionization oscillations thermionic emission
摘 要:Hollow cathode researches used to focus on the inner cavity or downstream plume,however,rarely on the gap between the throttling orifice plate and the keeper plate(T-K gap),which was found to impact the self-sustaining margin of hollow cathode discharge in this *** the lower margin,the main power deposition and electron emission and ionization regions would migrate from inner cavity and downstream plume to the T-K gap,in which case,the source and destination of each m A current therein matter for the self-sustaining *** the metal surfaces in the T-K gap with emissive materials proved effective in lowering the lower margin by supplementing auxiliary thermionic emission,compensating electron loss on cold absorbing walls and suppressing discharge *** doing so,the lower margin of a 4 A hollow cathode was lowered from 1 to 0.1-0.2 A,enabling it to couple with low power Hall thruster without extra keeper current.