Transverse dynamics of а surface wave excited by а wide electron beam

Fedotov, A. É.; Makhalov, P. B.

doi:10.1063/1.3691900

Cited by 5 publications

(7 citation statements)

References 32 publications

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“…Although the cutoff mode has infinite phase velocity, its harmonics are subliminal and can be synchronous to electron beams. This synchronism is being utilized in orotrons [5,26,34,43]. Equation ( 32) is governed by geometrical detuning…”

Section: Dispersion Characteristics Of Normal Waves In a Planar Corru...mentioning

confidence: 99%

“…First, TWT at the fundamental slowed-down harmonic and relativistic surface-wave oscillators (SWOs) are discussed. Despite numerous experimental realizations of such devices [18][19][20][21][22][23][24][25], consistent linear and non-linear theories had been lacking, despite some semi-phenomenological models describing the formation of the surface wave by the parabolic equations constructed based on the dispersion law [31,43]. At the same time, these regimes recently became more relevant for experiments [21][22][23][24][25] due to the advancement of the Cherenkov-type sources into the shorter-wavelength bands, as these regimes are characterized by the fairly high coupling of the electrons with the wave.…”

Section: Introductionmentioning

confidence: 99%

“…Throughout the paper, we consider two main geometries of Cherenkov radiation sources, the planar geometry and the cylindrical one. Planar geometry [43][44][45][46][47], albeit somewhat exotic for experimental realization, is much simpler for theoretical consideration and is used as the basic one. The more conventional cylindrical systems in the case of a fairly large oversize can be described in the quasi-planar approximation.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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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: Dispersion Characteristics Of Normal Waves In a Planar Corru...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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“…23,24 For practical estimations of the conventional scheme of a surface-wave oscillator we can take the beam width of 4-5 wavelengths corresponding to the regular field distribution presented in Fig. 9.…”

Section: D Model Of a Surface-wave Oscillatormentioning

confidence: 99%

Quasi-optical theory of relativistic surface-wave oscillators with one-dimensional and two-dimensional periodic planar structures

2013

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Within the framework of a quasi-optical approach, we develop 2D and 3D self-consistent theory of relativistic surface-wave oscillators. Presenting the radiation field as a sum of two counterpropagating wavebeams coupled on a shallow corrugated surface, we describe formation of an evanescent slow wave. Dispersion characteristics of the evanescent wave following from this method are in good compliance with those found from the direct CST simulations. Considering excitation of the slow wave by a sheet electron beam, we simulate linear and nonlinear stages of interaction, which allows us to determine oscillation threshold conditions, electron efficiency, and output coupling. The transition from the model of surface-wave oscillator operating in the p-mode regime to the canonical model of relativistic backward wave oscillator is considered. We also described a modified scheme of planar relativistic surface-wave oscillators exploiting twodimensional periodic gratings. Additional transverse propagating waves emerging on these gratings synchronize the emission from a wide sheet rectilinear electron beam allowing realization of a Cherenkov millimeter-wave oscillators with subgigawatt output power level. V C 2013 AIP Publishing LLC. [http://dx.

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“…In this paper, we study the possibility of implementing planar SWOs driven by sheet relativistic electron beams (see Fig. 1a) [4][5][6]. The main advantage of this configuration is the possibility of using planar waveguides that are open at the ends, which provides an additional mode selection mechanism for the corresponding open transverse coordinate x, thereby making it possible to increase the integral operating current of the oscillator due to the use of wider (on the scale of the wavelength) cathodes.…”

Section: Introductionmentioning

confidence: 99%

Design and experimental testing of W-band planar surface-wave oscillator driven by sheet high-current relativistic electron beam

Palitsin¹,

Zaslavsky²,

Rodin³

et al. 2022

8th International Congress on Energy Fluxes and Radiation Effects

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The paper presents the results of theoretical and experimental studies of W-band planar surface-wave oscillator driven by sheet high-current relativistic electron beam with experimentally realized parameters on the basis of the “SINUKI” accelerator (IAP RAS, N. Novgorod, 1 kА / 650 keV / 17 ns). In simulation of the oscillator nonlinear dynamics, we used both advanced quasi-optical approach and direct 3D PIC modeling. In the experiment, the microwave generation with a frequency of about 75 GHz was registered by microwave detector; measured pulse duration was about 4 ns. The output power measured by the calorimetric method was about 25 MW which is in a satisfactory agreement with the theoretical predictions. The important specific of the experimental set-up is the use of highly efficient side wall absorber for the implementation of a single-mode single-frequency generation regime.

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Transverse dynamics of а surface wave excited by а wide electron beam

Cited by 5 publications

References 32 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

Quasi-optical theory of relativistic surface-wave oscillators with one-dimensional and two-dimensional periodic planar structures

Design and experimental testing of W-band planar surface-wave oscillator driven by sheet high-current relativistic electron beam

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