摘要
为研究空心阴极在起弧、稳态及熄弧等三个关键过程的放电特性从而改善地面测试试验中供电电源与空心阴极的匹配性,搭建了实验平台进行了试验研究,获得了这三个过程中阴极的典型伏安特性曲线。对阴极组件起弧及稳态工作过程进行监测,通过动态回路平衡方程确定了使用稳压稳流电源时系统的稳态工作点,并通过试验验证了空心阴极在不同流率点下放电特性的变化情况。最后对空心阴极熄弧过程的伏安特性进行了研究,通过拉偏测试试验确定了维持阴极自持放电的最小维持功率。结果表明:空心阴极与供电电源构成的系统具有两个工作点,阴极在起弧至稳态工作过程中将跨过首个工作点并最终稳定在在阻抗更小的工作点上。阴极的稳态工作伏安特性呈现为典型的负阻特性,适当增大气体流量和发射电流可以提升发射效率。维持LHC-5L型BLa6阴极稳态放电所需最低输入功率为14 W,维持功率低于该值时空心阴极将熄弧。
The discharge characteristics of hollow-cathode of ion thruster,in the ignition,steady-state operation and extinguishing stages,were theoretically analyzed and experimentally evaluated with the lab-built test platform.The influence of the commercial power-supply on the typical volt-ampere characteristics was investigated with dynamic balance equation and via orthogonal design.The results show that when it comes to hollow-cathode driven by commercial power-supply,the hollow-cathode was stabilized at the 2nd operation point(Q)with lower impedance after passing the 1st operation point(A)in ignition to steady-state transition;the steady-state V-I curve exhibited a typical negative impedance characteristics;and the increases of emission current and xenon flow-rate improved the emission efficiency.The lowest input-power to maintain steady-state discharge of LHC-5 L ruthenium hexaboride cathode was 14 W,below which the hollow-cathode discharge will be extinguished.
作者
冯杰
成荣
王尚民
杨三祥
刘超
Feng Jie;Cheng Rong;Wang Shangmin;Yang Sanxiang;Liu Chao(Science and Technology on Vacuum Technology and Physics Laboratory,Lanzhou Institute of Physics,Lanzhou 730000,China)
出处
《真空科学与技术学报》
EI
CAS
CSCD
北大核心
2020年第1期40-46,共7页
Chinese Journal of Vacuum Science and Technology
关键词
空心阴极
起弧
熄弧
伏安特性
评价方法
Hollow cathode
Ignition
Extinguishing
Voltage-ampere characteristics
Evaluation method
作者简介
联系人:冯杰,Tel:(0931)4585510,E-mail:303298587@qq.com
