两种会切场离子推力器对比研究

Comparative Study of Two Types of Cusp Field Ion Thruster

关键词:  离子推力器  柱形会切场  环形会切场  束流均匀性  效率

Key words:  Ion thruster  Cylindrical-cusp field  Ring-cusp field  Uniformity of beam current density  Efficiency

摘要:

为了进一步提升离子推力器性能和可靠性，基于30cm环形会切场离子推力器LIPS-300H和30cm柱形会切场离子推力器LIPS-300Z，对比研究了两类会切场离子推力器各自优劣及其机理。首先分析了两种会切场原理，总结给出了两种会切场差异，然后实验对比研究了两种会切场离子推力器束流均匀性、放电效率和寿命。实验结果显示，LIPS-300H相比LIPS-300Z在3kW和5kW工况下束流密度峰值分别降低25%和19%，放电电压分别降低7.8V和6.2V，放电损耗分别增加31W/A和42W/A。此外，LIPS-300H离子推力器在3kW和5kW工况下屏栅预测寿命分别是LIPS-300Z的7.7倍和4.2倍。结果表明：虽然LIPS-300Z比LIPS-300H具有放电损耗低的优点，但其较差的束流均匀性、较高的放电电压和双荷离子比，使其在寿命和可靠性方面劣于LIPS-300H。

Abstract:

To further advance the performance and reliability of ion thruster， the advantage and disadvantage of two types of cusp field ion thruster were comparativly studied based on both a diameter 30cm cylindrical-cusp field ion thruster （LIPS-300Z） and a diameter 30cm ring-cusp field ion thruster （LIPS-300H）. Firstly， the principle of two types of cusp field was analyzed， and their difference was summarized. Then， the uniformity of beam current density， the discharge efficiency and the lifetime were evaluated and analyzed. Compared to the experimental results of the LIPS-300Z， the maximum beam current density of LIPS-300H at the 3kW and 5kW mode was decreased by 25% and 19%， and its discharge voltage was reduced by 7.8V and 6.2V， while the discharge loss of the LIPS-300H at two modes increased by 31W/A and 42W/A， respectively. In addition， the lifetime of screen grid of LIPS-300H at the 3kW and 5kW mode was 7.7 times and 4.2 times as long as LIPS-300Z. The results indicated that LIPS-300Z had a low discharge loss， but its uniformity of beam current density was worse， and the discharge voltage and the ratio of doubly-to-singly charged ions in beam were all high. Therefore， the lifetime and reliability of LIPS-300H were better than those of LIPS-300Z.