磁拓扑结构对环型离子推力器放电性能的影响

为得到环型离子推力器最佳磁拓扑结构以有效提高推力器放电效率、降低放电损耗，对不同类型磁拓扑结构下的放电通道气体放电过程进行研究。采用PIC MCC数值计算方法对等离子体产生及运输过程进行数值模拟，分析磁场分布对等离子体密度分布、电子损耗率及放电稳定性的影响，结合统计结果，得到推力器放电性能曲线，最后进行试验验证。研究结果表明，相较多极场结构，环尖场磁构型能更好地约束电子运动,大幅降低其在阳极壁面损耗率,增加电子与中性原子碰撞概率，显著提高放电效率、降低放电损耗。

The effect of magnetic topological structure on the performance of the annular engine

To obtain the most appropriate magnetic topological structure to improve the discharge efficiency and reduce the discharge loss of the annular engine, this paper studied the effect of different types of magnetic structure on the discharge process of the annular discharge channel. By applying the PIC/MCC method to simulate the generation and transport process of the plasma, this paper analyzed the influence of magnetic field distribution on the distribution of plasma, the loss rate and the discharge stability. According to the statistical results, the discharge performance curve of the annular engine was obtained and validated by the experimental results. The results show that the ring cusp magnetic refines the motion of the primary electrons better than the muli pole field, it can reduce the loss rate significantly, increase the probability of the collision between electrons and neutral atoms, improve the discharge efficiency and decrease the discharge loss.