Steady and oscillatory plasma properties in the near-field plume of a hollow cathode

Zun ZHANG (张尊); Kan XIE (谢侃); Jiting OUYANG (欧阳吉庭); Ning GUO (郭宁); Yu QIN (秦宇); Qimeng XIA (夏启蒙); Song BAI (白松); Xianming WU (吴先明); Zengjie GU (谷增杰)

doi:10.1088/2058-6272/aa9d7d

Plasma Science and Technology > 2018 > 20(2): 24010-024010. > DOI: 10.1088/2058-6272/aa9d7d

Zun ZHANG (张尊), Kan XIE (谢侃), Jiting OUYANG (欧阳吉庭), Ning GUO (郭宁), Yu QIN (秦宇), Qimeng XIA (夏启蒙), Song BAI (白松), Xianming WU (吴先明), Zengjie GU (谷增杰). Steady and oscillatory plasma properties in the near-field plume of a hollow cathode[J]. Plasma Science and Technology, 2018, 20(2): 24010-024010. DOI: 10.1088/2058-6272/aa9d7d

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Steady and oscillatory plasma properties in the near-field plume of a hollow cathode

1 School of Physics, Beijing Institute of Technology, Beijing 100081, People’s Republic of China 2 School of Astronautics, Beijing Institute of Technology, Beijing 100081, People’s Republic of China 3 Lanzhou Institute of Physics, CAST, Lanzhou 730000, People’s Republic of China

Funds: The authors would like to acknowledge financial support from National Natural Science Foundation of China under Grant Nos. 11402025 and 11475019, and also from China Academy of Space Technology under Grant Nos. YJJ0701 and ZWK1608.

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Received Date: July 19, 2017

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Abstract

Abstract

Hollow cathodes serve as electron sources in Hall thrusters, ion thrusters and other electric propulsion systems. One of the vital problems in their application is the cathode erosion. However, the basic erosion mechanism and the source of high-energy ions cause of erosion are not fully understood. In this paper, both potential measurements and simulation analyses were performed to explain the formation of high-energy ions. A high-speed camera, a single Langmuir probe and a floating emissive probe were used to determine the steady and oscillatory plasma properties in the near-field plume of a hollow cathode. The temporal structure, electron temperature, electron density, and both static and oscillation of plasma potentials of the plume have been obtained by the diagnostics mentioned above. The experimental results show that there exists a potential hill (about 30 V) and also severe potential oscillations in the near-plume region. Moreover, a simple 2D particle-in-cell model was used to analyze the energy transition between the potential hill and/or its oscillations and the ions. The simulation results show that the energy of ions gained from the static potential background is about 20 eV, but it could reach to 60 eV when the plasma oscillates.
- hollow cathode,
- plasma potential oscillation,
- Langmuir probe,
- emissive probe,
- PIC simulation

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References (30)

References

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Steady and oscillatory plasma properties in the near-field plume of a hollow cathode