Mechanism analysis of radiation generated by the beam-plasma interaction in a vacuum diode

Zengchao JI (季曾超); Shixiu CHEN (陈仕修); Shen GAO (高深)

doi:10.1088/1009-0630/19/1/015003

Plasma Science and Technology > 2017 > 19(1): 15003-015003. > DOI: 10.1088/1009-0630/19/1/015003

Zengchao JI (季曾超), Shixiu CHEN (陈仕修), Shen GAO (高深). Mechanism analysis of radiation generated by the beam-plasma interaction in a vacuum diode[J]. Plasma Science and Technology, 2017, 19(1): 15003-015003. DOI: 10.1088/1009-0630/19/1/015003

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Mechanism analysis of radiation generated by the beam-plasma interaction in a vacuum diode

School of Electrical Engineering, Wuhan University, Wuhan 430072, People’s Republic of China

Funds: Supported by National Nature Science Foundation of China (No.11075123), the Young Scientists Fund of Nature Science Foundation of China (No. 51207171).

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Received Date: January 31, 2016

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Abstract

Abstract

When we were studying the vacuum switch, we found that the vacuum diode can radiate a broadband microwave. The vacuum diode is comprised of a cathode with a trigger device and planar anode, there is not a metallic bellows waveguide structure in this device, so the radiation mechanism of the vacuum diode is different from the plasma filled microwave device. It is hard to completely imitate the theory of the plasma filled microwave device. This paper analyzes the breakdown process of the vacuum diode, establishes the mathematical model of the radiating microwave from the vacuum diode. Based on the analysis of the dispersion relation in the form of a refractive index, the electromagnetic waves generated in the vacuum diode will resonate. The included angle between the direction of the electromagnetic radiation and the initial motion direction of electron beam is 45 degrees. The paper isolates the electrostatic effect from the beam-plasma interaction when the electromagnetic radiation occurs. According to above analyses, the dispersion relations of radiation are obtained by solving the wave equation. The dispersion curves are also obtained based on the theoretical dispersion relations. The theoretical dispersion curves are consistent with the actual measurement time-frequency maps of the radiation. Theoretical deduction and experiments indicate that the reason for microwave radiating from the vacuum diode can be well explained by the interaction of the electron beam and magnetized plasma.
- beam-plasma interaction,
- dispersion relation,
- dispersion curve,
- wide band microwave radiation

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References (12)

References

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