Optimization of electron beams for ion bombardment secondary emission electron gun

Zebin WANG; Junbiao LIU; Aiguo CHEN; Dazheng WANG; Pengfei WANG; Li HAN

doi:10.1088/2058-6272/ad9819

Plasma Science and Technology > 2025 > 27(3): 035501. > DOI: 10.1088/2058-6272/ad9819 CSTR: 32219.14.2058-6272/ad9819

Zebin WANG, Junbiao LIU, Aiguo CHEN, Dazheng WANG, Pengfei WANG, Li HAN. Optimization of electron beams for ion bombardment secondary emission electron gun[J]. Plasma Science and Technology, 2025, 27(3): 035501. DOI: 10.1088/2058-6272/ad9819

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Optimization of electron beams for ion bombardment secondary emission electron gun

1.
Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
2.
University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
3.
Hypervelocity Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang 621000, People’s Republic of China

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Author Bio:
Junbiao LIU: liujb@mail.iee.ac.cn
Corresponding author:
Junbiao LIU, liujb@mail.iee.ac.cn
Received Date: August 20, 2024
Revised Date: November 25, 2024
Accepted Date: November 26, 2024
Available Online: November 27, 2024
Published Date: March 09, 2025

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Abstract

Abstract

Electron beam fluorescence technology is an advanced non-contact measurement in rarefied flow fields, and the fluorescence signal intensity is positively correlated with the electron beam current. The ion bombardment secondary emission electron gun is suitable for the technology. To enhance the beam current, COMSOL simulations and analyses were conducted to examine plasma density distribution in the discharge chamber under the effects of various conditions and the electric field distribution between the cathode and the spacer gap. The anode shape and discharge pressure conditions were optimized to increase plasma density. Additionally, an improved spacer structure was designed with the dual purpose of enhancing the electric field distribution between the cathode-spacer gaps and improving vacuum differential effects. This design modification aims to increase the pass rate of secondary electrons. Both simulation and experimental results demonstrated that the performance of the optimized electron gun was effectively enhanced. When the electrode voltage remains constant and the discharge gas pressure is adjusted to around 8 Pa, the maximum beam current was increased from 0.9 mA to 1.6 mA.
- air plasma,
- secondary emission electron gun,
- electron beam,
- performance optimization

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References (25)

References

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