磁场强度对霍尔推力器放电特性影响的实验研究

On the role of magnetic field intensity effects on the discharge characteristics of Hall thrusters

为探索霍尔推力器通道内优化磁场的标准,本文研究了磁场强度对其放电特性的影响规律.通过在保持磁场形貌不变("聚焦"形)下改变磁场强度的大小,使用朗缪尔探针、光谱仪等测量手段分析了工作于不同磁安特性曲线段的推力器放电特性.研究表明:当磁场强度小于优化值时,电子横越磁场的传导以近壁传导机制为主;反之,当磁场强度大于优化值时,放电电流反常变化,而现有的电子输运传导机制不能解释这种现象.

We investigates the magnetic field intensity effects on the discharge characterization of Hall thrusters for optimization of the magnetic fields by varying the strength of magnetic fields with its topography holds constant（keep in ＂focusing＂ type）,and making an experimental study of the thruster＇s operating performance working in different regions of magnetoampere curve through Langmuir probe,spectrograph,etc..The results shows that when the magnitude of magnetic field intensity is less than its optimal value,nearwall conductivity gives priority to the activity that electrons traverse the magnetic field;contrarily,discharge current varying with magnetic field intensity abnormally,and existing electrons conductive theories are failed to explain this phenomenon.