Effects of transverse electron beam motion in a relativistic backward wave oscillator operating at low guiding magnetic field

Wang, Huida; Xiao, Renzhen; Chen, Changhua; Wu, Ping; Shi, Yanchao

doi:10.1063/1.5134015

Cited by 6 publications

(1 citation statement)

References 18 publications

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“…According to the theory in Reference [17], the transverse kinetic energy of electrons is increased by strong traveling wave fields under a low magnetic field, which is detrimental to the high beam-wave conversion efficiency. Therefore, low-magnetic field and high-efficiency HPM sources usually extract the energy of electron beams by standing wave fields, which is regarded as transit radiation [6], [18], [19], [20], [21].…”

Section: Gw Was Obtained In Experiments With Amentioning

confidence: 99%

Improved Power Capacity in a Low-Magnetic Field and High-Efficiency Transit-Time Oscillator by a Double-Gap Extractor

Deng

Dang

et al. 2023

IEEE Access

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With an increase in the input power of a low-magnetic field and high-efficiency transit-time oscillator, the deceleration electric field in the single-gap extractor increases sharply to output a higher-power microwave, resulting in radio frequency breakdown on the surface of the single-gap extractor. Thus, a doublegap extractor with an operating mode of π mode is introduced to reduce the electric field in this type of device. The double-gap extractor can extract electron energy in two stages and lengthen the deceleration distance. Therefore, the electron beam loses less energy at the same deceleration distance in the double-gap extractor, and a weaker deceleration electric field is generated in the double-gap extractor. Additionally, the modulation electric field in the device with a double-gap extractor is stronger for modulating electrons and can further increase the fundamental harmonic current, resulting in higher extraction efficiency. In simulations, the output power is 6.3 GW and the maximum electric field strength is 1.06 MV/cm in the initial model with a single-gap extractor. When the single-gap extractor is replaced by the double-gap extractor, the output power increases to 6.5 GW with a conversion efficiency of 40% and a guiding magnetic field of 0.6 T. The maximum electric field strength decreases to 817 kV/cm, indicating an enhancement in the power capacity of the device.INDEX TERMS High-power microwaves, transit-time oscillator, improved power capacity, deceleration electric field.

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Section: Gw Was Obtained In Experiments With Amentioning

confidence: 99%

Improved Power Capacity in a Low-Magnetic Field and High-Efficiency Transit-Time Oscillator by a Double-Gap Extractor

Deng

Dang

et al. 2023

IEEE Access

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Experimental investigations on density bunching and its power influence in a relativistic backward-wave oscillator with low-magnetic-field operation

et al. 2020

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In a relativistic backward-wave oscillator operating at a low magnetic field, forward intense relativistic electron beams propagate with large transverse velocities and form a non-uniform beam-density distribution. This paper first investigates periodical density bunching by bombarding targets with electron beams in a relativistic drift tube. Then, the dependence of the density-bunching phase on interaction efficiency is studied experimentally for the first time with a C-band relativistic backward-wave oscillator. The results show a reduction in microwave power of over 40%, arising from a mismatch between the density-bunching phase and the standing-wave field in the resonant reflector, which is in reasonable agreement with particle-in-cell simulation results.

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Efficiency improvement by a beam filtering ring in a relativistic backward wave oscillator at low magnetic field

et al. 2022

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This paper presents a design method of the relativistic backward wave oscillator at low magnetic field, which can improve the efficiency by 29% in the particle in cell simulation. The core of this method is to introduce a beam filtering ring. The beam filtering ring takes the characteristic of the radial position change as the electron oscillates. The structure manipulates the axial current, so that a large proportion of the electrons expected to be in the accelerated phase in the slow-wave structure is absorbed by the structure. It greatly enhances the bunching of the beam in the RF field and improves the beam-wave conversion efficiency significantly. The particle in cell simulation results reveal that at a permanent magnet with a magnetic induction intensity of 0.68 T, the output microwave power of the relativistic backward wave oscillator with a beam filtering ring is 5.9 GW, and the conversion efficiency can be up to 54% when the diode voltage is 890 kV and the beam current is 12.2 kA.

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Effects of transverse electron beam motion in a relativistic backward wave oscillator operating at low guiding magnetic field

Cited by 6 publications

References 18 publications

Improved Power Capacity in a Low-Magnetic Field and High-Efficiency Transit-Time Oscillator by a Double-Gap Extractor

Improved Power Capacity in a Low-Magnetic Field and High-Efficiency Transit-Time Oscillator by a Double-Gap Extractor

Experimental investigations on density bunching and its power influence in a relativistic backward-wave oscillator with low-magnetic-field operation

Efficiency improvement by a beam filtering ring in a relativistic backward wave oscillator at low magnetic field

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