铟场致发射电推力器的研制

摘要

基于场致发射电推力器工作机理,分析并设计了针型铟场致发射电推力器的结构,利用微细电化学加工方法制作了发射针,并对该样机的伏安特性及稳定性等进行了相关测试.结果表明,该样机可正常发射,稳定性良好.对场致发射电推力器发射特性影响因素的分析发现,发射针针尖顶点半径对发射伏安特性有显著影响,而吸极内孔径及吸极到发射极距离对伏安特性影响并不大.%Based on the study of the field emission electric propulsion (FEEP) operating mechanism, the thruster prototype structure was designed, the emitting tip was fabricated with micro electrochemical etching method, and the current-voltage characteristics of the prototype were measured and its stability was investigated. The results show that the thruster prototype can operate normally with good stability. Factors influencing the current-voltage characteristics of the thruster were analyzed for optimization of its design. It is found that the radius of the emitting tip apex has great impact on the current-voltage characteristics, while the inner radius of the extractor and the distance between the extractor and emitter have minor effects.