Effect of Segmented Electrode Length on the Performances of an Aton-Type Hall Thruster  

作　　者：段萍 边兴宇 曹安宁 刘广睿 陈龙 殷燕 

机构地区：[1]Department of Physics,Dalian Maritime University

出　　处：《Plasma Science and Technology》2016年第5期525-530,共6页等离子体科学和技术（英文版）

基　　金：supported by National Natural Science Foundation of China(Nos.11375039 and 11275034);the Key Project of Science and Technology of Liaoning Province,China(No.2011224007);the Fundamental Research Funds for the Central Universities,China(No.3132014328)

摘　　要：The influences of the low-emissive graphite segmented electrode t）laeed near the channel exit on the discharge characteristics of a Hall thruster are studied using the particle- in-cell method. A two-dimensional physical model is established according to the Hall thruster discharge channel configuration. The effects of electrode length on the potential, ion density, electron temperature, ionization rate and discharge current are investigated. It is found that, with tile increasing of the segmented electrode length, the equipotential lines bend towards the channel exit. and approximately parallel to the wall at the channel surface, the radial velocity and radial flow of ions are increased, and the electron temperature is also enhanced. Due to the conductive characteristic of electrodes, the radial electric field and the axial electron conductivity near the wall are enhanced, and the probability of the electron-atom ionization is reduced, which leads to the degradation of the ionization rate in the discharge channel. However, the interaction between electrons and the wall enhances the near wall conductivity, therefore the discharge current grows along with the segmented electrode length, and the performance of the thruster is also affected.The influences of the low-emissive graphite segmented electrode t）laeed near the channel exit on the discharge characteristics of a Hall thruster are studied using the particle- in-cell method. A two-dimensional physical model is established according to the Hall thruster discharge channel configuration. The effects of electrode length on the potential, ion density, electron temperature, ionization rate and discharge current are investigated. It is found that, with tile increasing of the segmented electrode length, the equipotential lines bend towards the channel exit. and approximately parallel to the wall at the channel surface, the radial velocity and radial flow of ions are increased, and the electron temperature is also enhanced. Due to the conductive characteristic of electrodes, the radial electric field and the axial electron conductivity near the wall are enhanced, and the probability of the electron-atom ionization is reduced, which leads to the degradation of the ionization rate in the discharge channel. However, the interaction between electrons and the wall enhances the near wall conductivity, therefore the discharge current grows along with the segmented electrode length, and the performance of the thruster is also affected.

关 键 词：Hall thruster segmented electrodes PARTICLE-IN-CELL ionization rate 

分 类 号：V439.4[航空宇航科学与技术—航空宇航推进理论与工程]