Experimental study of a compact P-band coaxial relativistic backward wave oscillator with three periods slow wave structure

Gao, Liang; Qian, Baoliang; Ge, Xingjun; Zhang, Xiaoping; Jin, Zhenxing

doi:10.1063/1.4748564

Cited by 9 publications

(1 citation statement)

References 31 publications

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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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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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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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Effect of non-uniform slow wave structure in a relativistic backward wave oscillator with a resonant reflector

et al. 2013

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This paper provides a fresh insight into the effect of non-uniform slow wave structure (SWS) used in a relativistic backward wave oscillator (RBWO) with a resonant reflector. Compared with the uniform SWS, the reflection coefficient of the non-uniform SWS is higher, leading to a lower modulating electric field in the resonant reflector and a larger distance to maximize the modulation current. Moreover, for both types of RBWOs, stronger standing-wave field takes place at the rear part of the SWS. In addition, besides Cerenkov effects, the energy conversion process in the RBWO strongly depends on transit time effects. Thus, the matching condition between the distributions of harmonic current and standing wave field provides a profound influence on the beam-wave interaction. In the non-uniform RBWO, the region with a stronger standing wave field corresponds to a higher fundamental harmonic current distribution. Particle-in-cell simulations show that with a diode voltage of 1.02 MV and beam current of 13.2 kA, a microwave power of 4 GW has been obtained, compared to that of 3 GW in the uniform RBWO.

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Experimental study of a compact P-band coaxial relativistic backward wave oscillator with three periods slow wave structure

Cited by 9 publications

References 31 publications

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

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

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

Effect of non-uniform slow wave structure in a relativistic backward wave oscillator with a resonant reflector

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