A high efficiency X-band over-mode relativistic backward wave oscillator

Shi Yanchao; Teng Yan; Chen Changhua; Xiao Renzhen; Deng Yuqun; Yang Dewen; Wang Dongyang; Sun Jun

doi:10.11884/HPLPB201830.170491

Volume 30 Issue 7

Jul. 2018

Turn off MathJax

Article Contents

Article Navigation > High Power Laser and Particle Beams > 2018 > 30(7): 073002

Shi Yanchao, Teng Yan, Chen Changhua, et al. A high efficiency X-band over-mode relativistic backward wave oscillator[J]. High Power Laser and Particle Beams, 2018, 30: 073002. doi: 10.11884/HPLPB201830.170491

Citation:

Shi Yanchao, Teng Yan, Chen Changhua, et al. A high efficiency X-band over-mode relativistic backward wave oscillator[J]. High Power Laser and Particle Beams, 2018, 30: 073002. doi: 10.11884/HPLPB201830.170491

Citation:

PDF( 3986 KB)

A high efficiency X-band over-mode relativistic backward wave oscillator

doi: 10.11884/HPLPB201830.170491

Science and Technology on High Power Microwave Laboratory, Northwest Institute of Nuclear Technology, Xi'an 710024, China

Received Date: 2017-12-01
Rev Recd Date: 2018-01-29
Publish Date: 2018-07-15

Abstract

Abstract

This paper studies a high efficiency X-band over-mode relativistic backward wave oscillator (RBWO), which is composed of a dual-cavity reflector, a 7-periods trapezoid SWS and extraction cavity. The ratio of D to λ of the generator is 2.6, and the electron beam interacts with the TM₀₁ near π mode of the structure wave. In the SWS region the TM₀₁ mode surface wave mainly transfers to the TM₀₂ mode body wave, the primary mode of the output microwave is TM₀₂ mode with the proportion 81%, and the remainder is TM₀₁ mode. A method to design the resonant reflector under over-mode condition is proposed, a dual-cylindrical cavity reflector is optimized by using the mode-matching method, and the reflection coefficients for the TM₀₁ and TM₀₂ modes are larger than 0.99, hence good insulation between the SWS and the diode is achieved. Simultaneously, the longitudinal electric field of the resonant reflector could pre-modulate the electron beam sufficiently, which would promote the beam-wave interaction in the SWS. Furthermore, the transfer coefficient is increased by loading the extraction cavity after the SWS. Simulation results indicate that microwave output power of 6.6 GW is achieved, the diode voltage is 900 kV and beam current is 14.3 kA, and the transfer efficiency is 51%.
- high power microwave,
- relativistic backward wave oscillator,
- over-mode,
- resonant reflector

FullText(HTML)

References(10)

References

[1]	Carmel Y, Ivers J, Kribe R E, et al. Intense coherent Cherenkov radiation due to the interaction of a relativistic electron beam with a slow-wave structure[J]. Phys Rev Lett, 1974, 33: 1278-1282. doi: 10.1103/PhysRevLett.33.1278
[2]	Swegle J A, Poukey J W, Leifeste G T. Backward wave oscillators with rippled wall resonators: Analytic theory and numerical simulation[J]. Phys Fluids, 1985, 28: 2882-2894. doi: 10.1063/1.865209
[3]	Gunin A V, Klimov A I, Korovin S D, et al. Relativistic X-band BWO with 3-GW output power[J]. IEEE Trans Plasma Science, 1998, 26(3): 326-331. doi: 10.1109/27.700761
[4]	Chen Changhua, Liu Guozhi, Huang Wenhua, et al. A repetitive X-band relativistic backward-wave oscillator[J]. IEEE Trans Plasma Science, 2002, 30(3): 1108-1111. doi: 10.1109/TPS.2002.801656
[5]	Korovin S D, Kurkan I K, Rostov V V, et al. Relativistic backward wave oscillator with a discrete resonance reflector[J]. Radiophysics and Quantum Electronics, 1999, 42(12): 1047-1054. doi: 10.1007/BF02677128
[6]	Klimov A I, Kurkan I K, Polevin S D, et al. A multigigawatt X-band relativistic backward wave oscillator with a modulating resonant reflector[J]. Pis'ma V Zh Tekh Fiz, 2008, 34(3): 235-237.
[7]	宋玮, 陈昌华, 孙钧, 等. X波段相对论返波管谐振反射器[J]. 强激光与粒子束, 2010, 22(4): 853-856. http://www.hplpb.com.cn/article/id/4722 Song Wei, Chen Changhua, Sun Jun, et al. Resonant reflector of an X-band relativistic backward oscillator. High Power Laser and Particle Beams, 2010, 22(4): 853-856 http://www.hplpb.com.cn/article/id/4722
[8]	Xiao Renzhen, Li Jiawei, Bai Xianchen, et al. An overmoded relativistic backward wave oscillator with efficient dual-mode operation[J]. Appl Phys Lett, 2014, 104: 093505. doi: 10.1063/1.4867531
[9]	马乔生, 张运俭, 李正红, 等. X波段永磁包装相对论返波管研制[J]. 强激光与粒子束, 2017, 29: 023002. doi: 10.11884/HPLPB201729.160456 Ma Qiaosheng, Zhang Yunjian, Li Zhenghong, et al. Development of X-band relativistic backward-wave oscillator with permanent magnet. High Power Laser and Particle Beams, 2017, 29: 023002 doi: 10.11884/HPLPB201729.160456
[10]	Gesell G A, Ciric I R. Recurrence modal analysis for multiple waveguide discontinuities and its application to circular structures[J]. IEEE Trans Microwave Theory Tech, 1993, 41(3): 484-490. doi: 10.1109/22.223749