碳纳米管中和器工作特性研究  

Operating Characteristics of Carbon Nanotube Neutralizer for Space Exploration Missions

作　　者：汪宇欣 武志文[1] 黄天坤[1] 王云冰 WANG Yuxin;WU Zhiwen;HUANG Tiankun;WANG Yunbing(School of Aerospace Engineering,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学宇航学院,北京100081

出　　处：《深空探测学报（中英文）》2024年第2期151-158,共8页Journal Of Deep Space Exploration

基　　金：国家重点研发计划(2020YFC2201103)。

摘　　要：针对引力波探测和地球重力场探测等高精度空间探测任务对系统精度提高的要求,从碳纳米管场发射中和器的工作稳定性和电子引出问题进行试验设计,测试了其老练前后的电流波动特性,应用Spearman秩相关检验方法对背景电场和电流波动进行相关性分析,并使用3种不同孔径的栅极对中和器引出特性进行测试,分析了栅极孔径对中和器性能影响的机理。结果表明,老练处理有助于提高中和器工作稳定性,且发射极工作背景电场与发射电流不稳定性具有强相关关系;栅极孔径对发射性能与引出性能均有影响,在试验工况下1 mm孔径栅极性能最佳。该结果可为推进系统中的中和器配置和中和器结构设计提供一定指导。With the development of high-precision space exploration missions such as gravitational wave detection and Earth gravity field detection,the accuracy requirements of propulsion systems are further improved,and it is urgent to develop neutralizers with stable output of small current.In this paper,the working stability and electron extraction of carbon nanotube field emission neutralizer were experimentally studied.The current fluctuation characteristics before and after aging were tested,and spearman rank correlation test was used to analyze the correlation between background electric field and current fluctuation.Besides,three kinds of gate with different aperture were used to test the extraction characteristics of the neutralizer,and the influence mechanism of gate aperture on the performance of the neutralizer was analyzed.The experimental results show that aging treatment is helpful to improve the working stability of the neutralizer,and the background electric field of the emitter has a strong correlation with the instability of the emission current.The gate aperture has influence on both emission and extraction performance,and the 1 mm gate aperture has the best performance under experimental conditions.The results can provide some guidance for neutralizer configuration and structure design in propulsion system.

关 键 词：碳纳米管 中和器 稳定性 引出率 

分 类 号：V432[航空宇航科学与技术—航空宇航推进理论与工程]