Low magnetic field X-band over-mode relativistic backward wave oscillator with dual-cavity reflector

Zuo Jingfan; Li Shifeng; Wu Yang; Huang Hua; Sun Limin; Song Falun

doi:10.11884/HPLPB202436.230319

Volume 36 Issue 3

Feb. 2024

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Zuo Jingfan, Li Shifeng, Wu Yang, et al. Low magnetic field X-band over-mode relativistic backward wave oscillator with dual-cavity reflector[J]. High Power Laser and Particle Beams, 2024, 36: 033010. doi: 10.11884/HPLPB202436.230319

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Zuo Jingfan, Li Shifeng, Wu Yang, et al. Low magnetic field X-band over-mode relativistic backward wave oscillator with dual-cavity reflector[J]. High Power Laser and Particle Beams, 2024, 36: 033010. doi: 10.11884/HPLPB202436.230319

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Low magnetic field X-band over-mode relativistic backward wave oscillator with dual-cavity reflector

doi: 10.11884/HPLPB202436.230319

Zuo Jingfan^{1, 2
,},
Li Shifeng¹,
Wu Yang¹,
Huang Hua¹,
Sun Limin¹,
Song Falun^{1
,
,}

1.
Institute of Applied Electronics, CAEP, Mianyang 621900, China
2.
Graduate School of China Academy of Engineering Physics, Mianyang 621900, China

Received Date: 2023-09-17
Accepted Date: 2024-03-05
Rev Recd Date: 2024-03-04

Available Online: 2024-03-07

Publish Date: 2024-03-15

Abstract

Abstract

This paper propose an X-band over-mode high-efficiency relativistic backward wave oscillator (RBWO), whose main structure includes a dual resonant cavity reflector, a periodic slow wave structure and an inserted coaxial mode selector. The RBWO uses an over-mode structure and transmits a pure TM₀₁ mode in the output waveguide. The dual-cavity reflector enables the slow-wave structure to achieve good isolation from the diode region under over-mode conditions, and at the same time provides sufficient pre-modulation for the electron beam to achieve high microwave conversion efficiency under low magnetic field. The addition of the coaxial inner conductor allows the device to work in TM₀₂ mode, while eliminating other unnecessary mode competition, achieving higher power capacity. In the PIC simulation, under the conditions of a guiding magnetic field of 0.63 T, a diode voltage of 850 kV, and a beam current of 11.74 kA, a microwave output power of 3.5 GW was obtained, and the device efficiency was about 35%.
- high power microwave,
- relativistic backward wave oscillator,
- over-mode,
- resonant cavity reflector,
- mode selection

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References(15)

References

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