空心阴极触持极溅射腐蚀会导致离子推力器性能退化甚至失效,为确保离子推力器长期工作性能稳定性,触持极材料应选用溅射腐蚀速率尽可能低的材料.开展不同触持极结构对空心阴极放电性能的影响研究.最后,进行了1000 h短期地面寿命实验.实验结果表明,石墨触持极空心阴极放电性能稳定,长期工作触持极表面的溅射腐蚀不明显,能够有效避免空心阴极长时间工作后因触持极溅射腐蚀导致的性能退化.%Aiming at extending the ion thruster life,Graphite-Keeper hollow cathodes have been developed. The keep-er disk are made of high density graphite,which possesses much higher tolerance to ion impingement compared with con-ventional metal materials. We made a performance test of different structure keeper. At last in order to validate the keeper performance,we started a performance test of a discharge cathode,until May 2016 the cumulative operation time reached 1000 hours. The hollow cathode anode voltages,keeper voltages have been almost constant and stable,and no severe deg-radation has been found on the electrodes.
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