基于碳纳米管阴极的空间低能离子源  

A Space Low Energy Ion Source Based on Carbon Nanotube Emitter

作　　者：张虎忠[1] WURZ Peter 李得天[1] 成永军[1] ZHANG Huzhong;WURZ Peter;LI Detian;CHENG Yongjun(Science and Technology on Vacuum Technology and Physics Laboratory,Lanzhou Institute of Physics,Lanzhou 73000,China;Physics Institute,University of Bern,Bern 3012,Switzerland)

机构地区：[1]兰州空间技术物理研究所真空技术与物理重点实验室,兰州730000 [2]Physics Institute,University of Bern,Bern 3012,Switzerland

出　　处：《真空与低温》2020年第1期21-24,共4页Vacuum and Cryogenics

基　　金：国家自然科学基金(No.61601211、No.61671266、61471184)

摘　　要：空间等离子体环境是空间科学探测的重要目标,空间离子原位测量数据主要应用于星球演变、空间环境等领域,标准离子源对于离子探测仪器具有不可或缺的标定作用。本研究阐述了一种基于碳纳米管阴极的空间低能离子校准源,可对空间低能离子探测仪器提供地面标定。研究结果表明,当碳纳米管阴极的发射电流稳定在约70μA时,可提供约1μA的电子流用于气体电离,产生的Ar^+离子流约为10 pA,对应离子浓度约为200 cm^-3,在95 min的连续工作过程中灵敏度波动小于19%。To study the evolution of planet and space environment,the space plasma is always detected in space scientific mission.The standard ion source is crucial for calibrating the space applied ions detector.A low energy ion source based on carbon nanotube emitter has been constructed and investigated.The ion source could be used in calibration of low energy ion detection instruments on the ground.As the results shown,1μA could be extracted and used in ionizing gas molecular while the emission current was stabilized around 70μA.In the experiment,10 pA argon ions current corresponding ion density of 200 cm^-3 was produced and kept stable for 95 minutes with sensitivity fluctuation of lower than 19%.

关 键 词：离子源 碳纳米管 离子流 发射电流 

分 类 号：TB774[一般工业技术—真空技术]