基于E×B探针系统的霍尔推力器束流特性分析

Beam Characteristics Analysis of Hall Thruster Based on E×B Probe System

为探究霍尔推力器羽流中各价态离子能量分布,并以此为依据评估推力器性能,根据Wien条件,设计了一种用于测量稀薄等离子体羽流场不同电荷状态离子分布的E×B探针系统。基于对探针最大输入角离子的运动分析,推导了仅与探针结构参数相关的能量分辨率关系式,并以此为依据设计了探针,使用该E×B探针系统对200 W量级霍尔推力器进行羽流离子成分诊断。分析结果表明:距离推力器出口500 mm处,在中轴线角度0~20°内,单电荷氙离子Xe~+比例分数为90.42%~94.25%,对应的Xe比例分数为9.58%~5.75%;随着角度的增加,Xe~+比例分数减少,Xe比例分数增加,平均电荷增加;推力器的电荷利用效率、电压利用效率分别为99.38%、86.95%。该探针系统的测量结果可为分析推力损失和优化推力器性能提供参考,并可为羽流仿真提供验证。

In order to explore the energy distribution of various ions in Hall thruster plume and evaluate the performance of the thruster,an E×B probe system is designed for measuring the ion distribution of different charge states in the rarefied plasma plume field according to the Wien condition(formula(2) in the text). Based on the kinematic analysis of the ions at the maximum input angle of the probe,the energy resolution expression related only to the structural parameters of the probe is derived,in terms of which the probe is designed. The E×B probe system is used to diagnose the ionic compositions in the plume of a 200 W Hall thruster. The experimental results show that at a distance of 500 mm from the thruster outlet and with a central axis angle ranging from 0° to 20°,the proportion fraction of the single-charged xenon ion,Xeis between 90.42% and 94.25%,and the corresponding proportion fraction of Xeis between 9.58% and 5.75%. With the increase in the angle,the proportion fraction of Xedecreases,the proportion fraction of Xeincreases,and the average quantity of electric charge increases. The charge utilization efficiency and voltage utilization efficiency of the thruster are respectively 99.38% and 86.95%. The measurement results can provide references for the thrust loss analysis and the performance optimization,and provide verification for the plume simulation.