Study on excitation characteristics of high-order mode coaxial multi-gap cavity

Zhang Xu; Wang Yong; Zhang Rui

doi:10.11884/HPLPB202032.200193

Volume 32 Issue 10

Sep. 2020

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Article Navigation > High Power Laser and Particle Beams > 2020 > 32(10): 103009

Zhang Xu, Wang Yong, Zhang Rui. Study on excitation characteristics of high-order mode coaxial multi-gap cavity[J]. High Power Laser and Particle Beams, 2020, 32: 103009. doi: 10.11884/HPLPB202032.200193

Citation:

Zhang Xu, Wang Yong, Zhang Rui. Study on excitation characteristics of high-order mode coaxial multi-gap cavity[J]. High Power Laser and Particle Beams, 2020, 32: 103009. doi: 10.11884/HPLPB202032.200193

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Study on excitation characteristics of high-order mode coaxial multi-gap cavity

doi: 10.11884/HPLPB202032.200193

Zhang Xu^{1, 2
,},
Wang Yong^{1, 2
,},
Zhang Rui^1
,

1.
Key Laboratory of Science and Technology on High Power Microwave Sources and Technologies, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China
2.
School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2020-07-08
Rev Recd Date: 2020-09-15
Publish Date: 2020-09-29

Abstract

Abstract

This paper proposes a Ka-band coaxial multi-gap cavity operating in the TM₅₁-2π mode. The CST eigenmode solver is used to study the characteristics of the electric field distribution, and the mode characteristics of this cavity have been analyzed based on the all-pass coupling structure at the outer radius. By combining space-charge wave theory and 3-D particle-in-cell (PIC) simulation analysis, this paper studies the start-oscillation characteristics of the high-order mode coaxial multi-gap cavity using the multi-beam excitation method. And it analyzes the mode stability and beam-wave interaction characteristics of the coaxial multi-gap cavity operating in the high-order mode. The results show that the coaxial multi-gap cavity operating in the TM₅₁-2π mode adopting the coupling method at the outer radius possesses high mode stability. In this structure, multiple beams can not only uniformly inspire the operating mode but also non-uniformly inspire the competition mode. Different from the multi-beam extended-interaction klystron (EIK) operating in the fundamental mode, the high-order mode EIK with this structure establishes the gap voltages separately. Therefore, the peak electric fields with different phases can interact with the beams respectively. While keeping the same total beam current and beam voltage, the operating method driven by more beams requires a smaller focusing magnetic field.
- high-order mode,
- coaxial multi-gap cavity,
- multiple beams,
- mode competition,
- excitation characteristics,
- CST-PIC simulation

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References(15)

References

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