| Citation: | LI J P，JIN W Y，ZHAO Y D，et al. Unexpected electric breakdown control and thermal characteristics of ion thruster shell[J]. Journal of Beijing University of Aeronautics and Astronautics，2025，51（3）：865-873 （in Chinese） doi: 10.13700/j.bh.1001-5965.2023.0162
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Unexpected breakdowns of ion thrusters affect their reliability in engineering applications. In order to reduce the frequency of unexpected electric breakdown between shell and screen grid of the thruster, the unexpected breakdown mechanism was clarified through theoretical analysis and experimental methods. By considering the thermal design and the elimination of unexpected electric breakdowns, the shell optimization design and thermal characteristic analysis of three schemes were carried out. A shell scheme verification and heat balance test system was built. The results show that the frequency of unexpected electric breakdowns is significantly higher at high power than at low power. After the single-sided anodized shell on the inner surface is adopted, the frequency of unexpected electric breakdowns of the thruster is reduced from 6.90 times/h before optimization to 0.70 times/h under 5 kW working condition and from 3.3 times/h before optimization to 0.20 times/h under 3 kW working condition. The maximum temperature measured at the electrical connector is 148.5 ℃, meeting the application requirements. The effect of different shell schemes on the temperature change of the thermally sensitive assembly is small, with a temperature difference within 5 ℃, and the maximum error of the thruster temperature test and thermal analysis is less than 10 ℃.
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