Effects of anode material on the evolution of anode plasma and characteristics of intense electron beam diode

Ye HUA; Ping WU; Hong WAN; Shuxin BAI; Jinyu GONG; Meng ZHU; Xianchen BAI; Guangshuai ZHANG

doi:10.1088/2058-6272/acc8bb

Plasma Science and Technology > 2023 > 25(9): 095402. > DOI: 10.1088/2058-6272/acc8bb

Ye HUA, Ping WU, Hong WAN, Shuxin BAI, Jinyu GONG, Meng ZHU, Xianchen BAI, Guangshuai ZHANG. Effects of anode material on the evolution of anode plasma and characteristics of intense electron beam diode[J]. Plasma Science and Technology, 2023, 25(9): 095402. DOI: 10.1088/2058-6272/acc8bb

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Effects of anode material on the evolution of anode plasma and characteristics of intense electron beam diode

1.
Key Laboratory of Advanced Science and Technology on High Power Microwave, Northwest Institute of Nuclear Technology, Xi'an 710024, People's Republic of China
2.
College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, People's Republic of China

More Information

Corresponding author:
Ye HUA, E-mail: huaye@nint.ac.cn
Received Date: October 31, 2022
Revised Date: March 08, 2023
Accepted Date: March 28, 2023
Available Online: December 05, 2023
Published Date: June 05, 2023

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Abstract

Abstract

In this paper, three kinds of materials including graphite, titanium (Ti) and molybdenum (Mo) are used as anodes to figure out the influence factors of anode material on the characteristics of the intense electron beam diode. The results show that the characteristics of diode are mainly determined by the cathode plasma motion under a 15 mm diode gap, in which the typical electron beam parameters are 280 kV, 3.5 kA. When the diode gap is reduced to 5 mm, the voltage of the electron beam reduces to about 200 kV, and its current increases to more than 8.2 kA. It is calculated that the surface temperatures of Ti and Mo anodes are higher than their melting points. The diode plasma luminescence images show that Ti and Mo anodes produce plasmas soon after the bombardment of electron beams. Ti and Mo lines are respectively found in the plasma composition of Ti and Mo anode diodes. Surface melting traces are also observed on Ti and Mo anodes by comparing the micromorphologies before and after bombardment of the electron beam. These results suggest that the time of anode plasma generation is closely related to the anode material. Compared with graphite, metal Ti and Mo anodes are more likely to produce large amounts of plasma due to their more significant temperature rise effect. According to the moment that anode plasma begins to generate, the average expansion velocities of cathode and anode plasma are estimated by fitting the improved space-charge limited flow model. This reveals that generation and motion of the anode plasma significantly affect the characteristics of intense electron beam diode.
- anode material,
- anode plasma,
- intense electron beam,
- plasma expanding velocity

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Acknowledgments

The authors would like to thank Dr D Cai, Dr H T Wang, Dr X L Sun and Mr L Luo for their help in experiments.

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