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束流离子生产成本和推进剂利用率是表征离子推力器放电室性能的重要参数。在考虑不改变放电室几何结构、磁场分布并保持离子推力器比冲和效率的前提下,利用一维经验分析模型对兰州空间技术物理研究所研制的LIPS-200离子推力器放电室性能进行了优化分析,以实现推力器的推力从40mN提高到60mN的目标要求。分析结果表明,提高放电室推进剂流率至2.06mg/s,放电室内放电电流维持在6.9A,放电室内平均氙离子密度达到2.167×1017 m-3时,可以保证引出1.2A的束流,推力器达到60mN的推力。与之对应的推进剂利用率为92%,束流离子生产成本约为188.515 W/A,相比推力40mN时,推进剂利用率为88%、束流离子生产成本为188.29W/A的情况,放电室性能有所提高。另外,放电室性能优化过程中其鞘层电位始终保持在3.80～6.65eV范围内。
Beam ion production costs and propellant utilization are important parameters that characterize the performance of ion thruster discharge cells. Based on the one-dimensional empirical analysis model, the performance of the LIPS-200 ion thruster discharge chamber developed by Lanzhou Institute of Space Physics was studied on the premise of not changing the geometric structure of the discharge chamber, the magnetic field distribution and maintaining the specific impulse and efficiency of the ion thruster. Optimize the analysis to achieve the thrust target thrust from 40mN to 60mN target requirements. The results show that when the discharge chamber propellant flow rate is increased to 2.06mg / s, the discharge current in the discharge chamber is maintained at 6.9A and the average density of xenon ions in the discharge chamber reaches 2.167 × 1017m-3, the beam current of 1.2A can be guaranteed. Thrust up to 60mN thrust. The corresponding propellant utilization rate was 92%, the beam ion production cost was about 188.515 W / A, the propellant utilization rate was 88% and the beam ion production cost was 188.29 W / A when compared with the thrust force of 40 mN , Discharge chamber performance has improved. In addition, the discharge cell performance optimization process its sheath potential remained at 3.80 ~ 6.65eV range.