工质流量对ECR离子源束流影响研究  

Study on influence of propellant flow rate on ECR ion source beam current

作　　者：牟浩 耿海[2] 吴先明[2] 蒲彦旭 谈人玮 杨涓[1] MOU Hao;GENG Hai;WU Xianming;PU Yanxu;TAN Renwei;YANG Juan(School of Astronautics,Northwestern Polytechnical University,Xi'an 710072,China;Science and Technology on Vacuum Technology and Physics Laboratory,Lanzhou Institute of Physics,Lanzhou 730000,China)

机构地区：[1]西北工业大学航天学院,陕西西安710072 [2]兰州空间技术物理研究所真空技术与物理重点实验室,甘肃兰州730000

出　　处：《西北工业大学学报》2024年第5期793-800,共8页Journal of Northwestern Polytechnical University

基　　金：国家自然科学基金面上项目(12375252)资助。

摘　　要：栅格进气道电子回旋共振(electron cyclotron resonance,ECR)离子源推进剂供给压强低、无阴极,有应用于吸气式电推进系统的潜力。流量对离子源的束流影响显著,当流量超过临界流量时,离子束流的增长受到抑制。为明晰限制离子束流增长的根本原因,开展不同流量下氮工质栅格进气道ECR离子源的Langmuir探针诊断实验,并基于诊断结果计算了寻常(ordinary,O)波截止区和电子获能指标的分布。研究结果表明,当流量低于临界流量时,随着流量增加,离子密度快速增加,限制离子束流增长的主要因素是中性气体密度。当流量超出临界流量时,O波截止区几乎覆盖整个等离子体产生区域,这导致电子能量获取效率下降了一个数量级。此时,限制离子束流增长的主要因素转变为电子温度。The electron cyclotron resonance(ECR)ion source with grid inlet has the characteristics of low propellant supply pressure and no cathode required for operation,so it has the potential for application in atmosphere breathing electric propulsion.The flow rate has a significant impact on the beam current of the ion source.When the flow rate exceeds the critical flow rate,the increase of the ion beam is suppressed.To clarify the determining factors that limit the increase of ion beam flow,this paper conducted Langmuir probe diagnostic experiments on ECR ion sources with grid inlet driven by nitrogen gas at different flow rates,and calculated the distribution of ordinary(O)wave cutoff region and electron energy acquisition indicators based on the diagnostic results.The research results indicate that when the flow rate is below the critical flow rate,the ion density rapidly increases with the increase of flow rate,and the main factor limiting the increase of ion beam is the neutral gas density.When the flow rate exceeds the critical flow rate,the O wave cutoff zone almost covers the entire main plasma production aera,which leads to a decrease of one order of magnitude in the efficiency of electron energy acquisition.At this moment,the main factor limiting the increase of ion beams shifts to electron temperature.

关 键 词：电子回旋共振离子源 等离子体诊断 流量 吸气式电推进 

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]