Stimulated scattering of waves in microwave generators with high-current relativistic electron beams: simulation of two-stage free-electron lasers

Bratman, V. L.; Денисов, Г. Г.; Smorgonsky, A. V.; Korovin, S. D.; Polevin, S. D.; Ростов, В. В.; Yalandin, M. I.

doi:10.1080/00207218508920700

Cited by 46 publications

(4 citation statements)

References 21 publications

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“…ELECTROMAGNETICALLY PUMPED FREE ELECTRON LASER The theory of the classical (magnetostatically pumped) FEL has been extensively developed [21], [22] and will not be discussed in detail. Although the full theory of electromagnetically pumped free electron lasers is less complete [23], [24] and is also beyond the scope of this paper, a brief physical picture will be presented in conjunction with those portions of the theory needed to predict the complex output spectrum. The electromagnetically pumped FEL is attractive because it enables significant increases in the radiation frequency for the same beam parameters (as compared to the magnetostatic wiggler-driven FEL) and continuous tunability by changing the electromagnetic pump frequency.…”

Section: Review Of Classical (Magnetostatic) Andmentioning

confidence: 99%

Free electron laser pumped by a powerful traveling electromagnetic wave

Kehs

Carmel

Granatstein

et al. 1990

IEEE Trans. Plasma Sci.

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A three-wave free-electron laser (FEL) was operated with a powerful 8.4-GHz electromagnetic "pump" wave replacing the usual magnetostatic wiggler. The presence of a uniform axial magnetic field B,, produced cyclotron-harmonic "idler" waves. Peaks in the emission spectrum corresponding to cyclotron harmonics were observed covering a frequency range from 16.5 to 130 GHz. The frequency spectrum of this novel FEL mechanism was tuned continuously by the variation of B,,.

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Section: Review Of Classical (Magnetostatic) Andmentioning

confidence: 99%

Free electron laser pumped by a powerful traveling electromagnetic wave

Kehs

Carmel

Granatstein

et al. 1990

IEEE Trans. Plasma Sci.

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“…It should be mentioned that more complex Bragg scattering schemes based on three or more partial waves, including the case where these waves have a large group velocity[16] and where some of them are quasi-critical[17,18], have also been studied before. However, in all of these papers, the Bragg resonance conditions for all partial waves were fulfilled (or approximately fulfilled) in some frequency band (Bragg scattering zone).…”

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confidence: 99%

Peculiarities of the Mode Spectrum in Free-Electron Masers Based on Oversized Bragg Resonators with a Corrugation Phase Step

Peskov

Kaminsky

Kuzikov

et al. 2016

Radiophys Quantum El

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UDC 621.385We study the operating mode splitting caused by interaction of the neighboring Bragg scattering zones in an oversized Bragg resonator with a corrugation phase step, which is operated at the coupled forward and backward waveguide modes with different transverse structures. This effect is described within the framework of the coupled-wave approach using an advanced four-wave model. It is shown that this effect deteriorates the selective properties of the resonator and, finally, restricts the output power and reduces stability of the narrow-band operating regime in the free-electron masers (FEMs) based on such resonators. The results of the theoretical analysis were corroborated by 3D simulations and "cold" electrodynamic tests. Experimental studies of 30-GHz FEMs with the Bragg resonators having different corrugation depths demonstrated the onset of both narrow-band single-mode and multifrequency multimode oscillation regimes in such resonators. The possibility of power enhancement by using passive compression of the FEM output pulse in a double-frequency oscillation regime is discussed.

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“…Thus, to design an oversized BWO, a very complicated problem should be solved, namely, to provide some form of mode selection. Some successful designs based on using a selective Bragg reflector for the desired mode were described in [10] and [11].…”

Section: B Mode Selection In Oversized Surface-wave Generatorsmentioning

confidence: 99%

Overmoded GW-class surface-wave microwave oscillator

Vlasov

Shkvarunets

Rodgers

et al. 2000

IEEE Trans. Plasma Sci.

178

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Abstract-Results of theoretical and experimental studies of a GW-class, large diameter microwave oscillator are presented. The device consists of a large cross-section (overmoded), slow-wave structure with a unique profile of wall radius specifically designed to support surface waves and to provide a strong beam-wave coupling at moderate voltage (500 kV), an internal adjustable microwave reflector, a coaxial microwave extraction section, and a coaxial magnetically insulated field emission electron gun. In preliminary experiments carried out at 8.3 GHz, the power level exceeding 0.5 GW and efficiency of 15% have been measured calorimetrically.Index Terms-High-power microwave (HPM), overmoded, surface-wave oscillator.

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Stimulated scattering of waves in microwave generators with high-current relativistic electron beams: simulation of two-stage free-electron lasers

Cited by 46 publications

References 21 publications

Free electron laser pumped by a powerful traveling electromagnetic wave

Free electron laser pumped by a powerful traveling electromagnetic wave

Peculiarities of the Mode Spectrum in Free-Electron Masers Based on Oversized Bragg Resonators with a Corrugation Phase Step

Overmoded GW-class surface-wave microwave oscillator

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