Design of a high-efficiency dual-band coaxial relativistic backward wave oscillator with variable coupling impedance and phase velocity

Tang, Yongfu; Meng, Lin; Li, Hailong; Liang, Zheng; Wang, Bin; Zhang, Feina

doi:10.1017/s0263034612000882

Cited by 9 publications

(5 citation statements)

References 26 publications

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“…Relativistic backward wave oscillator (RBWO) is one of the most promising high-power microwave (HPM) devices owing to its compact structure, high-conversion efficiency, and repetitive operation [1][2][3][4][5][6][7][8]. In the past several decades, many methods have been proposed to continuously improve the power capacity and pulse width of RBWOs, such as the overmoded structures, the more effective resonant reflector, and the surface treating methods [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Destructive Effects with Electron Bombardment in Slow-Wave Structures

Tan

Hua

et al. 2022

Laser Part. Beams

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Radio frequency (RF) breakdown can result in pulse shortening and seriously degrade the stability and reliability of relativistic backward wave oscillators (RBWOs). This paper discusses the energy range of electrons causing breakdown traces in slow-wave structures (SWSs) through particle-in-cell (PIC) simulation, numerical calculation, and experimental verification. The PIC simulation and numerical calculation results reveal that the energy of the majority of the field-induced electrons bombarding the SWS surfaces after being accelerated is less than 120 keV. Furthermore, the micro appearances of the breakdown traces in SWSs and the witness targets bombarded directly by electrons of various energy levels have been analyzed. Scanning electron microscope (SEM) shows that the breakdown traces are featured with corrugated morphologies with a wide range and a shallow depth. A mass of craters emerge in the vicinity of the corrugated morphologies. These appearances are quite similar to destructive traces impacted directly by low-energy electrons (around 160 keV). Thus, it is confirmed that the breakdown traces result from the bombardment of low-energy electrons. Therefore, the breakdown mechanism of field-emitted electrons impacting on the structure surfaces in RBWOs has been further improved.

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Section: Introductionmentioning

confidence: 99%

Analysis of Destructive Effects with Electron Bombardment in Slow-Wave Structures

Tan

Hua

et al. 2022

Laser Part. Beams

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“…Tang et al [15] have demonstrated an X-band dual-frequency coaxial relativistic backward wave oscillator (CRBWO) with sectioned SWSs and the frequencies of the two dominant frequencies were observed to be 10.06 and 10.49 GHz, respectively. Compared with MILO and other HPM devices, the RBWO has good adaptation to variable electron beam parameters [16]. Teng et al [6] designed a CRBWO with the experimental output frequency and power are 7.40 GHz and 710 MW, respectively.…”

Section: Introductionmentioning

confidence: 99%

Experimental Research of X-Band Dual-Frequency Coaxial Relativistic Backward Wave Oscillator

Zhu

Tang

et al. 2020

IEEE J. Electron Devices Soc.

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The design and experimental demonstration of an X-band coaxial dual-frequency relativistic backward wave oscillator (CRBWO) with sectioned slow wave structures (SWSs) is presented. In this paper, we describe the experimental measurement methods of frequency, power and operation mode for the high-power microwave signal. In experimental tests, with a 500 kV, 11.5 kA beam guided by a 0.82 T magnetic field, a microwave with an average power of 507 MW and pulsewidth of 50 ns has been obtained. Also, the dominant frequencies of the X-band dual frequency are 9.845 GHz and 10.517 GHz, and the dual-frequency difference ≈ 672 MHz, which was similar to the particle-in-cell simulation results. The operation mode of the device is determined to be TM01 mode in our experiment.

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“…In recent years, with the development of pulsed power technology Kuai et al, 2009;Liu et al, 2006;Yatsui et al, 2005;Zou et al, 2006), devices generating high power microwave (HPM) have been developed greatly (Benford et al, 2007;He et al, 2011;Li et al, 2010;Tang et al, 2013;Zhang et al, 2010). And power level in excess of 1 GW has been achieved in a number of cases (Cao et al, 2012a;Eltchaninov et al, 2003;Gao et al, 2012;Ge et al, 2010;Jin et al, 2011;Xiao et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

A Ku-band coaxial relativistic transit-time oscillator with low guiding magnetic field

Ling

Zhang

et al. 2014

Laser Part. Beams

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A novel coaxial relativistic transit-time oscillator with low guiding magnetic field is proposed and investigated to generate high power microwave at Ku-band. With the coaxial structure and a quasi body wave adopted as the operating mode, the device has a larger space-charge limiting current, higher power handling capacity, and lower guiding magnetic field. Moreover, for further improving the output power, a coaxial TM 02 mode resonant reflector is well designed. Main structure parameters of the device are optimized by particle in cell simulations. A typical simulation result is that, with a 358 keV, 7.25 kA beam guided by a magnetic field of about 0.7 T, an 810 MW microwave pulse at 14.25 GHz is generated, yielding a conversion efficiency of about 31%. The primary experiments are also carried out. At a low guiding magnetic field of 0.7 T, a microwave pulse with power of 400 MW, pulse duration of 30 ns, frequency of 14.3 GHz close to the simulation one, and efficiency of 15.4% is generated.

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Design of a high-efficiency dual-band coaxial relativistic backward wave oscillator with variable coupling impedance and phase velocity

Cited by 9 publications

References 26 publications

Analysis of Destructive Effects with Electron Bombardment in Slow-Wave Structures

Analysis of Destructive Effects with Electron Bombardment in Slow-Wave Structures

Experimental Research of X-Band Dual-Frequency Coaxial Relativistic Backward Wave Oscillator

A Ku-band coaxial relativistic transit-time oscillator with low guiding magnetic field

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