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Li, Jiayin; Xie, Fuzhen; Liu, Shenggang

doi:10.1023/a:1021799500790

Cited by 7 publications

(4 citation statements)

References 3 publications

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“…Since the synchronous harmonics in the cross section of the CRBWO are enhanced and more efficient synchronous beam-wave interaction could be acquired than the non-coaxial one [9], a smaller interaction length of each section and a smaller guiding magnetic field length are needed. In the design of our CRBWO, the length of the guiding magnetic field is 26 cm (see figure 7, the region from −10 to 16 cm on the horizontal axis), while the length needed in the non-coaxial case is about 56 cm [6].…”

Section: Discussionmentioning

confidence: 99%

“…Compared with non-coaxial RBWO, the coaxial RBWO (CRBWO) offers a number of attractive features: firstly, because the synchronous harmonics in the cross section of the coaxial waveguide are enhanced, more efficient synchronous beam-wave interaction and higher radio-frequency (RF) power conversion efficiency may be obtained [9]; secondly, the space-charge-limiting current in the coaxial waveguide is larger than that in the former with the same wall and beam radii [10,11], which will increase the power-handling capacity; lastly, a wide frequency tunability can be achieved by varying the energy of the electron beam [11].…”

Section: Introductionmentioning

confidence: 99%

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A dual-frequency coaxial relativistic backward-wave oscillator with a modulating resonant reflector

Tang¹,

Meng²,

Li³

et al. 2012

Phys. Scr.

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An X-band dual-frequency coaxial relativistic backward-wave oscillator with a modulating resonant reflector is presented and investigated in this paper. Through a theoretical study, numerical analysis and particle-in-cell (PIC) simulation, the stationary single-frequency regime is selected as the operation regime, and the high-frequency characteristics of the system, including the unstable beam–wave interaction regions and operation mode of each section, are obtained. The PIC simulation results indicate that an average power of 1.07 GW with a power conversion efficiency of 24.2% is obtained with an electron beam of 520 kV and 8.5 kA guided by an axial magnetic field of 2.4 T, and the two dominant frequencies are 9.43 and 10.30 GHz, respectively. Furthermore, a periodic-like change in the smaller dominant frequency with a frequency agility bandwidth of about 0.40 GHz is acquired.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A dual-frequency coaxial relativistic backward-wave oscillator with a modulating resonant reflector

Tang¹,

Meng²,

Li³

et al. 2012

Phys. Scr.

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“…Cherenkov oscillators [1][2][3][4][5] driven by relativistic electron beam are widely recognized as one of most promising high power microwave (HPM) sources for the high efficiency and high output power. Especially for the large overmoded coaxial devices [6][7][8][9][10][11], due to the high power handling capacity (PHC) and wide electron beam channel, they are widely used in the high frequency and high power fields. However, there inevitably exist multi-modes in the output microwave, which may have an impact on microwave radiation.…”

Section: Introductionmentioning

confidence: 99%

An improved corrugated waveguide mode purifier for TEM output in a V-band overmoded coaxial millimeter-wave oscillator

Chen

Zhang

2020

Phys. Scr.

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In the overmoded microwave sources, there inevitably exist multi-modes in the output microwave, so it needs to be purified to obtain the single mode output. However, due to the large longitudinal size, the traditional concave-type purifier is not suitable for coaxial devices with large overmoded ratio. The present paper proposes an improved convex-type purifier based on the coupled wave equations. With this purifier, 99.98% TEM mode can be gained effectively under the conditions of diode voltage 355 kV and beam current 3.0 kA. Compared with the traditional concave-type converter, the improved purifier has the higher coupling coefficient and its longitudinal size can be reduced by 40%.

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“…In addition, compared with the coaxial singlecorrugation SWS, 5,6 the coupling impedance in the former is larger. ͑3͒ Compared with the coaxial relativistic BWO presented by Wen et al,7 in the CGCS, the spent electrons are dumped into the inner conductor wall, which is beneficial for enhancing the efficiency due to the well-modulated electron beam before collected. ͑4͒ The coaxial SWS and the electron collector form a resonator, and in the case of resonance, the interaction can be more powerful.…”

Section: Introductionmentioning

confidence: 99%

A Cerenkov generator with coaxial slow wave structure

Liu

Xiao

Chen

et al. 2008

Journal of Applied Physics

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Results of analytic theory, numerical simulation, and experimental studies on a Ceronkov generator with coaxial slow wave structure are presented. The dispersion curves and the field patterns of the axial modes are given in the analytic theory, showing the operation mode of quasi-TEM mode. The numerical simulation results indicate that the device is featured by the resonance characteristics, the microwave frequency spectrum illustrates high purity, the dominant frequency remains fairly constant over a wide range of diode voltage, and the optimized efficiency of more than 37% is obtained. In preliminary experiment, a microwave pulse with frequency of 7.7GHz, power of 1.3GW, and efficiency of 28% was obtained.

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Untitled

Cited by 7 publications

References 3 publications

A dual-frequency coaxial relativistic backward-wave oscillator with a modulating resonant reflector

A dual-frequency coaxial relativistic backward-wave oscillator with a modulating resonant reflector

An improved corrugated waveguide mode purifier for TEM output in a V-band overmoded coaxial millimeter-wave oscillator

A Cerenkov generator with coaxial slow wave structure

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