Discharge instability in a plasma contactor  

作　　者：Kan XIE Feng TIAN Fuwen LIANG Qimeng XIA Ningfei WANG 谢侃;田丰;梁福文;夏启蒙;王宁飞(School of Aerospace Engineering,Beijing Institute of Technology,Beijing 100081,People's Republic of China)

机构地区：[1]School of Aerospace Engineering,Beijing Institute of Technology,Beijing 100081,People's Republic of China

出　　处：《Plasma Science and Technology》2020年第9期87-94,共8页等离子体科学和技术（英文版）

基　　金：financial support from National Natural Science Foundation of China(Nos.11402025,11475019,and 11702123);National Key Laboratory of Science and Technology on Vacuum Technology and Physics(No.ZWK1608);Advanced Space Propulsion Laboratory of BICE and Beijing Engineering Research Center of Efficient and Green Aerospace Propulsion Technology(No.Lab ASP-2018-03)。

摘　　要：Like the hollow cathode,discharge instability also occurs during the operation of a plasma contactor.Voltage and current probes were employed to test the change of keeper voltage,keeper current,anode voltage,and anode current parameters with time under different working conditions.The anode current range corresponding to the discharge instability phenomenon is about 0.4 A to 1.2 A,and the emission characteristic curve in this area appears to bulge wherein the four parameters all produce different degrees of oscillation,the anode current oscillation being the greatest.Its waveform is considered to consist of a small-amplitude,high-frequency triangular wave and a large-amplitude,low-frequency sawtooth wave,and we have explained the shape of the wave.Each parameter shows hundreds of Hz in oscillation frequency and the phases of the four parameters appear to be regular.After fast Fourier transform processing,the frequency and amplitude of the main peak of the anode current oscillation tend to change with changes of the anode current,and there are differences in the trends under different keeper currents and xenon flows.

关 键 词：plasma contactor discharge instability emission characteristics 

分 类 号：V439.2[航空宇航科学与技术—航空宇航推进理论与工程]