A high-power relativistic backward wave oscillator with a longitudinal slot slow-wave system

Goykhman, Mikhail; Kladukhin, V. V.; Kladukhin, S. V.; Kovalev, N. F.; Kolganov, N. G.; Khramtsov, S. P.

doi:10.1134/s1063785014010222

Cited by 8 publications

(2 citation statements)

References 4 publications

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“…For the realization of traveling wave tube (TWT) amplifiers [6,7], one can use either the interaction with the 1st (s = 1, point D1) or with the fundamental (s = 0, point A) [3,16,17] decelerated harmonic of the wave co-moving (hν || > 0) with the beam. Among the oscillator schemes, first of all, the backward wave oscillator (BWOs) [1,2,[4][5][6][7][8][9][10][11][12][13][14][15] should be fundamental ( s = 0, point A) [3,16,17] decelerated harmonic of the wave co-moving ( || 0 hν > ) with the beam. Among the oscillator schemes, first of all, the backward wave oscillator (BWOs) [1,2,[4][5][6][7][8][9][10][11][12][13][14][15] should be identified, where the electrons interact with the spatial harmonic of the wave propagating in a backward ( || 0 hν < , points C) direction.…”

Section: Introductionmentioning

confidence: 99%

“…Among the oscillator schemes, first of all, the backward wave oscillator (BWOs) [1,2,[4][5][6][7][8][9][10][11][12][13][14][15] should be fundamental ( s = 0, point A) [3,16,17] decelerated harmonic of the wave co-moving ( || 0 hν > ) with the beam. Among the oscillator schemes, first of all, the backward wave oscillator (BWOs) [1,2,[4][5][6][7][8][9][10][11][12][13][14][15] should be identified, where the electrons interact with the spatial harmonic of the wave propagating in a backward ( || 0 hν < , points C) direction. The orotron regime of interaction [5,26] should also be mentioned, in which the radiation frequency is close to the cutoff frequency of the operating mode ( 0 h → , point E).…”

Section: Introductionmentioning

confidence: 99%

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Quasi-Optical Theory of Relativistic Cherenkov Oscillators and Amplifiers with Oversized Electrodynamic Structures

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Using the quasi-optical approach, we investigate wave propagation along the periodically corrugated surfaces and their interaction with rectilinear relativistic electron beams (REBs). At the periodical structure, the field can be expanded into a series of spatial harmonics, which, in the case of shallow corrugations, represent paraxial wavebeams with mutual coupling described within the method of effective surface magnetic currents. We present the dispersion equation for the normal waves. Two limit cases can be recognized: in the first one, the frequency is far from the Bragg resonance and the wave propagation can be described within the impedance approximation with the field presented as a sum of the fundamental slow wave and its spatial harmonics. In the interaction with a rectilinear REB, this corresponds to the convective instability of particles’ synchronism with the fundamental (0th) or higher spatial harmonics (TWT regime), or the absolute instability in the case of synchronism with the −1st harmonic of the backward wave (BWO regime). In the latter case, at the frequencies close to the Bragg resonance, the field is presented as two antiparallel quasi-optical wavebeams, leading to the absolute instability used in the surface-wave oscillators operating in the π-mode regime. Based on the developed theory, we determine the main characteristics of relativistic Cherenkov amplifiers and oscillators with oversized electrodynamical systems. We demonstrate the prospects for the practical implementation of relativistic surface-wave devices in submillimeter wavebands.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quasi-Optical Theory of Relativistic Cherenkov Oscillators and Amplifiers with Oversized Electrodynamic Structures

et al. 2022

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Development of High-Current Relativistic Gyrotrons with the Operating TM Mode

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Radiophys Quantum El

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Quasi-optical theory of relativistic Cherenkov surface-wave oscillators with oversized cylindrical waveguides

2021

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Within the quasi-optical approach, we investigate the propagation of azimuthally symmetric TM waves in periodically corrugated cylindrical waveguides and their excitation by relativistic electron beams. Presenting the field as two, forward and backward, quasi-optical wavebeams coupled at the shallow corrugation, we obtain a dispersion equation for normal waves and thus a criterion of existence of the surface wave. For a finite-length corrugation section, the spectrum of axial evanescent eigenmodes is estimated; the spatial structure and the quality factor of the fundamental mode are found at an eigenfrequency close to the Bragg frequency. A self-consistent system of equations describing the interaction of electromagnetic waves with a rectilinear electron beam injected into the system is derived. Based on this model, we recognize two oscillation regimes, namely, the π-mode excitation regime and the regime of backward surface wave oscillator. We demonstrate the viability of practical implementation of relativistic surface wave oscillators with a power level of up to 140 MW in the sub-millimeter wavelength band.

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A high-power relativistic backward wave oscillator with a longitudinal slot slow-wave system

Cited by 8 publications

References 4 publications

Quasi-Optical Theory of Relativistic Cherenkov Oscillators and Amplifiers with Oversized Electrodynamic Structures

Quasi-Optical Theory of Relativistic Cherenkov Oscillators and Amplifiers with Oversized Electrodynamic Structures

Development of High-Current Relativistic Gyrotrons with the Operating TM Mode

Quasi-optical theory of relativistic Cherenkov surface-wave oscillators with oversized cylindrical waveguides

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