Design and operation of a dual vircator HPM source

Clements, K. R.; Curry, R. D.; Druce, Robert; Carter, W.; Kovac, Martin; Benford, James; McDonald, K.F.

doi:10.1109/tdei.2013.6571421

Cited by 10 publications

(7 citation statements)

References 8 publications

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“…39,40,42 Nowadays, a rising interest in the research of vircators is caused by their advantages: a very high output microwave radiation power, a simple construction (in particular, vircators can operate without external focusing magnetic field), short rise time, the possibility of a simple frequency tuning and regime switching (tunability), a rather short operation region, and low requirements to the quality of the electron beam. 1,14,15,[43][44][45][46][47][48][49][50] The last property is of great importance when an oscillator is fed with a short and lowquality beam formed by an explosion emission electron injector. 51,52 a) Electronic mail: KurkinSA@gmail.com…”

Section: Introductionmentioning

confidence: 99%

The development and interaction of instabilities in intense relativistic electron beams

et al. 2015

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We report on the physical mechanisms of development, coexistence and interaction of Pierce-Bursian and diocotron instabilities in the non-neutral relativistic electron beam (REB) in the classic vircator. The analytical and numerical analysis is provided by means of 3D electromagnetic simulation. We conducted an extensive study of characteristic regimes of REB dynamics determined by the instabilities development. As a result, a regime map has been obtained. It demonstrates sequential switching of the REB dynamics from the regime with N ¼ 1 to the regime with N ¼ 7 electron bunches in the azimuth direction with the beam current growth for the different external magnetic fields. The numerical analysis of bunch equilibrium states has identified the physical causes responsible for the REB regime switchings. V

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Section: Introductionmentioning

confidence: 99%

The development and interaction of instabilities in intense relativistic electron beams

et al. 2015

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“…The microwave generators with a virtual cathode (VC) -virtual cathode oscillators (VCOs, vircators) -are the perspective devices of vacuum and plasma high-power microwave electronics for the generation of the impulses of microwave radiation due to their high output power, a simple construction (particularly, vircators can operate without the external focusing magnetic field), the possibility of a simple frequency tuning and regime switching (tunability) (Burkhart et al 1985;Sullivan et al 1987;Hoeberling and Fazio 1992;Gold and Nusinovich 1997;Dubinov and Selemir 2002;Benford et al 2007;Liu et al 2008;Hramov et al 2012;Clements et al 2013;Kurkin et al 2013). The operation of VCOs (vircators, virtodes, reflex triodes, etc.…”

Section: Introductionmentioning

confidence: 99%

Effect of the electron beam modulation on the sub-THz generation in the vircator with the field-emission cathode

2015

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In this paper, we focus on the numerical investigation of the vircator with a controlling emission from a field-emission cathode. The external harmonic signal is added to the accelerating electric field in the beam formation region and effects on the beam emission process leading to the electron emission modulation. As a consequence, the beam is injected into the drift chamber of the vircator being density-modulated. The strong influence of the modulation parameters (modulation depth and frequency) on the characteristics of virtual cathode oscillations has been discovered. We have shown that the tuning of the modulation frequency to the harmonics of the basic frequency of virtual cathode oscillations leads to the considerable power increase of its higher harmonics in the output spectrum.

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“…1,3,7,[16][17][18] The main advantages of VCOs are the following: very high output microwave radiation power, a simple construction (let us emphasize that vircators can operate without external focusing magnetic field), fast rise time, the possibility of a simple frequency tuning and regime switching (tunability), rather short operation region and low demands on the quality of the electron beam. 4,6,7,[19][20][21][22][23] The last property is of great importance when the oscillator is fed with short and low-quality beam formed by an explosion emission electron injector. 24 At the same time, the important problem of HPM electronics is the development of effective high-power microwave amplifiers, especially the final amplifiers for the amplification of relatively power signals.…”

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confidence: 99%

High-power microwave amplifier based on overcritical relativistic electron beam without external magnetic field

Kurkin

Frolov

Рак

et al. 2015

Applied Physics Letters

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The high-power scheme for the amplification of powerful microwave signals based on the overcritical electron beam with a virtual cathode (virtual cathode amplifier) has been proposed and investigated numerically. General output characteristics of the virtual cathode amplifier including the dependencies of the power gain on the input signal frequency and amplitude have been obtained and analyzed. The possibility of the geometrical working frequency tuning over the range about 8%-10% has been shown. The obtained results demonstrate that the proposed virtual cathode amplifier scheme may be considered as the perspective high-power microwave amplifier with gain up to 18 dB, and with the following important advantages: the absence of external magnetic field, the simplicity of construction, the possibility of geometrical frequency tuning, and the amplification of relatively powerful microwave signals. V C 2015 AIP Publishing LLC.

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Design and operation of a dual vircator HPM source

Cited by 10 publications

References 8 publications

The development and interaction of instabilities in intense relativistic electron beams

The development and interaction of instabilities in intense relativistic electron beams

Effect of the electron beam modulation on the sub-THz generation in the vircator with the field-emission cathode

High-power microwave amplifier based on overcritical relativistic electron beam without external magnetic field

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