| 摘要: |
| 离子推力器的极限寿命最终取决于栅极的极限寿命。针对LIPS-200离子推力器延长寿命到20000h以上的工程应用需求，在分析离子推力器极限寿命所对应关键失效模式及磨损机理的基础上，基于加速电压能够有效调节关键失效模式发展进程的工作机制，提出了具有普适性的离子推力器栅极极限寿命优化的恒定加速电压方法和步进调节加速电压方法。结合LIPS-200离子推力器寿命试验的过程及最终结果数据，在完全继承推力器现有技术状态和成熟度的前提下，采用恒定加速电压方法可以将推力器的极限寿命从现有的14649h提高到17300h，采用步进调节加速电压方法可以将推力器极限寿命提高到20400h，从而实现LIPS-200延长寿命目标。 |
| 关键词: 极限寿命 离子推力器 优化方法 关键失效模式 加速电压 |
| DOI：10.13675/j.cnki.tjjs.210219 |
| 分类号:V433.9+3 |
| 基金项目:甘肃省科技计划基金（18JR3RA412）。 |
|
| Ion Optics Lifetime Optimization for Ion Thruster |
|
ZHANG Xue-er1,2, ZHANG Tian-ping1,2, LI De-tian1,2, MENG Wei1,2
|
|
1.Science and Technology on Vacuum Technology and Physics Laboratory，Lanzhou Institute of Physics， Lanzhou 730000，China;2.Key Laboratory of Space Electric Propulsion Technology of Gansu Province，Lanzhou Institute of Physics， Lanzhou 730000，China
|
| Abstract: |
| The lifetime of ion thruster depends on the lifetime of ion optics. With the goal of extending the lifetime of LIPS-200 thruster to 20000h and above， the key failure modes and erosion mechanism corresponding to the maximum thruster lifetime were studied. Based on the effect of accel voltage on the wear process， two universal methods for optimizing the lifetime of ion optics， including fixed-accel-voltage approach （FAA） and stepped-accel-voltage approach （SAA）， were brought up. These approaches were validated based on the data from the life test of LIPS-200. The results show that without changing the existing design and maturity level， the lifetime of LIPS-200 can increase from 14649h to 17300h by applying FAA， while SAA can achieve a lifetime of 20400h which is above the 20000h goal. |
| Key words: Lifetime Ion thruster Optimization Key failure mode Accel voltage |
