LaB6空心阴极放电电压波动现象及发生机理
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V439

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军用电子元器件支撑项目(1607XM0004)


Study on discharge voltage fluctuation of LaB6 Hollow Cathode
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    摘要:

    由于发射电流密度大,LaB6空心阴极已被广泛地用于空间电推进领域。针对间歇性放电时LaB6空心阴极放电电压波动的现象,首先分析不同区间放电电压波动幅值及规律,确定造成电压波动的原因。然后对试验后的LaB6发射体表面成份及中毒机理进行了分析,最终得出:暴露大气后LaB6空心阴极表面吸附了大量的氧气,并与其表面形成了强偶极矩,导致发射体表面逸出功增加。由此,再次工作时放电电压将上升;通过对LaB6发射体加热预处理或离子轰击的方式,可去除发射体表面吸附的氧气和形成的氧化物,此时空心阴极的放电电压将降低。使用该方式能有效改善空心阴极放电性能、提高器件的可靠性。

    Abstract:

    Because of high emission current density, LaB6 hollow cathode has been widely used in the field of space electric propulsion. Aiming at the phenomenon of voltage fluctuation in intermittent discharge, firstly, amplitudes and law of voltage fluctuation in different intervals were analyzed to determine causes of voltage fluctuation. Then, the surface composition and poisoning mechanism of LaB6 emitter were analyzed, it is concluded that after exposure to the atmosphere, a large amount of oxygen was absorbed on the surface of LaB6 emitter, and a strong dipole moment was formed between surface, resulting in surface work function of emitter increases accordingly. Thus, the anode voltage will rise when working again. Oxygen and oxides can be removed from the surface of LaB6 emitter by heating or ion bombardment. The hollow cathode performance and ion thruster reliability can be improved by this method.

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杨威,史楷,谷增杰,等. LaB6空心阴极放电电压波动现象及发生机理[J]. 科学技术与工程, 2020, 20(33): 13914-13918.
YANG Wei, 史楷, GU Zeng-Jie, et al. Study on discharge voltage fluctuation of LaB6 Hollow Cathode[J]. Science Technology and Engineering,2020,20(33):13914-13918.

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  • 收稿日期:2020-02-16
  • 最后修改日期:2020-09-15
  • 录用日期:2020-05-11
  • 在线发布日期: 2020-12-18
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