Numerical study of the radio-frequency biased accelerating system in ion thrusters  

作　　者：白进纬 曹勇 李阳 王开发 田滨 胡远 Jinwei BAI;Yong CAO;Yang LI;Kaifa WANG;Bin TIAN;Yuan HU(School of Science,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,People's Republic of China;School of Mechanical Engineering and Automation,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,People's Republic of China;School of Aeronautics and Astronautics,University of Electronic Science and Technology of China,Chengdu 611731,People's Republic of China;State Key Laboratory of High Temperature Gas Dynamics,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,People's Republic of China)

机构地区：[1]School of Science,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,People's Republic of China [2]School of Mechanical Engineering and Automation,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,People's Republic of China [3]School of Aeronautics and Astronautics,University of Electronic Science and Technology of China,Chengdu 611731,People's Republic of China [4]State Key Laboratory of High Temperature Gas Dynamics,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,People's Republic of China

出　　处：《Plasma Science and Technology》2023年第8期87-102,共16页等离子体科学和技术（英文版）

基　　金：supported by the China Postdoctoral Science Foundation(No.2022M710977);National Natural Science Foundation of China(No.51907039);the Natural Science Foundation of Guangdong Province(Nos.2022A1515110215 and 2023A1515010137);Shenzhen Technology Projects(Nos.JCYJ20190806142603534 and ZDSYS201707280904031)。

摘　　要：A 2D-3V implicit immersed-finite-element particle-in-cell(IFE-PIC)model is introduced to investigate the radio-frequency(RF)self-bias accelerating system applied in the RF ion thruster.A set of holes in a two-grid system with slit apertures is simulated in Cartesian coordinates.The characteristics of the plasma plume,such as the ion density,the neutralization rate and the ion and electron current density were investigated for different RF voltage amplitudes(600-1200V)and frequencies(6-30 MHz).Furthermore,the performance of the thruster was also carefully studied.The simulation results show that a well-focused plasma beam can be formed when the voltage amplitude is larger than 900 V and the frequency exceeds the reciprocal of ion transit time(≥12 MHz)in our simulation cases.The performance of the system can be evidently improved by increasing the voltage amplitude and the frequency,and the losses of the particle and thrust are reduced correspondingly.The bulk region of the plasma beam downstream shows good quasi-neutrality,and the ions are dominant in the peripheral region when a well-focused state is achieved.The high ion density beamlet in the periphery of the ion beam is closer to the axis when the voltage amplitude is increasing,while it is expanded radially when increasing the frequency.Backstream electrons have been observed upstream,and this mainly occurs in the phase in which the electron cannot escape.

关 键 词：ion thruster radio-frequency biased grids implicit immersed-finite-element particlein-cell plasma plume 

分 类 号：V439.1[航空宇航科学与技术—航空宇航推进理论与工程]