Influence of heating on the discharge characteristics of a hollow cathode

Yanlin HU (扈延林); Zhongxi NING (宁中喜); Xiaoyu LIU (刘晓宇); Yanfeng CHU (初彦峰); Wei MAO (毛威); Yan SHEN (沈岩); Ximing ZHU (朱悉铭)

doi:10.1088/2058-6272/ab472a

Plasma Science and Technology > 2020 > 22(1): 15401-015401. > DOI: 10.1088/2058-6272/ab472a

Yanlin HU (扈延林), Zhongxi NING (宁中喜), Xiaoyu LIU (刘晓宇), Yanfeng CHU (初彦峰), Wei MAO (毛威), Yan SHEN (沈岩), Ximing ZHU (朱悉铭). Influence of heating on the discharge characteristics of a hollow cathode[J]. Plasma Science and Technology, 2020, 22(1): 15401-015401. DOI: 10.1088/2058-6272/ab472a

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Influence of heating on the discharge characteristics of a hollow cathode

¹ Beijing Institute of Control Engineering, Beijing 100080, People's Republic of China
² Plasma Propulsion Lab, Institute of Advanced Power, Harbin Institute of Technology, Harbin 150001, People's Republic of China

Funds: This study was supported by National Natural Science Foundation of China (Nos. 61571166 and 11775063), the Key Fund under grant No. 51736003, and a laboratory fund under grant No. LabASP-2017-05.

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Received Date: July 02, 2019
Revised Date: September 18, 2019
Accepted Date: September 23, 2019

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Abstract

Abstract

Hollow cathodes are widely used as electron sources and neutralizers in ion and Hall electric propulsion. Special applications such as commercial aerospace and gravitational wave detection require hollow cathodes with a very wide discharge current range. In this paper, a heater is used to compensate for the temperature drop of the emitter at low current. The self-sustained current can be extended from 0.6 to 0.1 A with a small discharge oscillation and ion energy when the flow rate is constant. This is also beneficial for long-life operation. However, when the discharge current is high (>1 A), heating can cause discharge oscillation, discharge voltage and ion energy to increase. Further, combined with a rapid decline of pressure inside the cathode and an increase in the temperature in the cathode orifice plate, electron emission in the orifice and outside the orifice increases and the plasma density in the orifice decreases. This leads to a change in the cathode discharge mode.
- electric propulsion hollow cathode,
- discharge oscillation,
- heater,
- extended operation range

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References (30)

References

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Influence of heating on the discharge characteristics of a hollow cathode