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

Malkin, A. M.; Sergeev, A. S.; Zaslavsky, V. Yu.

doi:10.1063/1.4826221

Cited by 19 publications

(11 citation statements)

References 24 publications

(53 reference statements)

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“…1a). We assume that the electron beam moves along a flat plate which has a section of length lz with a shallow sinusoidal corrugation ( ) ( ) Radiation fields in this electrodynamic system are represented as a superposition of two counter propagating quasioptical wave beams, the magnetic field of which can be written as [6] ( )…”

Section: Three-dimensional Quasi-optical Model Of Planar Swomentioning

confidence: 99%

“…In the Bragg resonance condition 0 / 2 k k h ≈ = , the coupling and mutual scattering of the counter-propagating wave beams with field (2) arise on the corrugated surface. Amplitudes of coupled wave beams are described by a set of equations [6] ( ) ( )…”

Section: Three-dimensional Quasi-optical Model Of Planar Swomentioning

confidence: 99%

“…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%

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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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Section: Three-dimensional Quasi-optical Model Of Planar Swomentioning

confidence: 99%

Section: Three-dimensional Quasi-optical Model Of Planar Swomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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show abstract

“…1. The main (d-periodic) corrugation couples two quasi-optical paraxial TM-polarized wavebeams propagating along the surface in the opposite directions of z-axis under Bragg resonance condition ω/c ≈ h̅ /2 [15,16]. The corrugation with the period 2d scatters these wavebeams in the normal direction to the plane of the grating, providing the power output.…”

Section: Simulations and Design Of Surface-wave Oscillator With Trans...mentioning

confidence: 99%

Transverse radiation input and output for planar relativistic surface-wave oscillators and amplifiers

Fedotov¹,

Malkin²,

Zaslavsky³

et al. 2022

8th International Congress on Energy Fluxes and Radiation Effects

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Planar surface-wave resonators are very attractive for development of relativistic high-current sources of high-power subterahertz radiation, due to their unique mode selective features. However, evanescent nature of the surface operating wave guided by periodic grating brings a number of difficulties such as wave scattering at the grating edges, power leakage to the cathode, and high ohmic losses. To overcome these problems, we propose using a bi-periodical gratings providing decoupling of the surface wave to the Gaussian microwave beam traveling in the transverse direction. Moreover, the same principle can be used for power input in the relativistic extended-interaction klystron with surface-wave resonators. An analytical quasi-optical theory based on coupled-wave equations are developed for surface-wave resonators with transverse power input-output, as well for planar beam devices based on these resonators. It is shown that the transverse energy extraction significantly reduces the Ohmic losses down to 10% of the radiated power which is essential for sub-THz range. The simulations based on both the quasi-optical model and PIC simulations show that surface-wave oscillator driven by 600 kV, 1 kA could produce 140 MW of output power at 150 GHz with 25% efficiency. For 150 GHz amplifier with the similar beam, simulations predict the 20–40 MW of output power and 20–30 dB linear gain in 1% bandwidth.

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“…For improvement of stability of high cyclotron harmonic operation regime, multiple-beam schemes of gyrotrons are investigated [2]. Studies of relativistic surface wave Cherenkov oscillators with 1D and 2D periodical slow-wave structures were investigated [4,5]. For all models comparison with experimental data and results of theoretical consideration based on simplified averaged equations are carried out.…”

Section: Introductionmentioning

confidence: 99%

Simulations of powerful microwave oscillators with oversized electrodynamics systems

Zaslavsky

2017

EPJ Web Conf.

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IntroductionNowadays, various types of numerical codes are effective tools for analysis and optimization of electron microwave devices. Special codes are widely used to simulate the microwave components, the electron-optical system, and nonlinear dynamics. Nevertheless, up to now most of the simulations related to electron optics and electron-wave interaction were restricted by exploiting 2D self-consistent numerical models. At the same time, the state-of-the-art high-performance computational clusters combined with modern commercial codes look sufficient for 3D physical modeling of vacuum electronic devices with strongly oversized interaction space.The paper is devoted to review of recent results of the CST STUDIO SUITE particle-in-cell (PIC) simulations of broad class of relativistic and sub relativistic microwave oscillators and amplifiers. In this report we consider terahertz-band gyrotrons with conventional cylindrical and planar configurations of the interaction space [1][2][3]. Here we discuss generators operating at the fundamental harmonic, as well as at the second and third harmonics. For improvement of stability of high cyclotron harmonic operation regime, multiple-beam schemes of gyrotrons are investigated [2]. Studies of relativistic surface wave Cherenkov oscillators with 1D and 2D periodical slow-wave structures were investigated [4,5]. For all models comparison with experimental data and results of theoretical consideration based on simplified averaged equations are carried out. This analysis demonstrates that at present stage 3D PIC simulations can be considered as an effective tool for design and development of new schemes of powerful microwave generators and amplifiers. In addition, with the use of modern graphics processing units, it is possible to optimize parameters of electron devices for improvement characteristics within a reasonable calculation time. High cyclotron harmonic operation in the double-beam THz gyrotronsIn this section, we explore a double-beam scheme of a short-wavelength gyrotron [2]. To date, the authors have extended this concept to the development of THz gyrotrons operating in CW regime at the second cyclotron harmonic. A double-beam scheme of a shortwavelength gyrotron with two generating helical electron beams operating at the second cyclotron harmonic is studied using 3D PIC simulations. Analysis shows that the introduction of an additional generating electron beam allows increase drastically the operating current of a second-harmonic gyrotron with the simultaneous suppression of self-excitation of spurious modes at the fundamental harmonic. This PIC code allows integrating directly (without averaging) the Maxwell equations together with the electron motion equations in the real geometry of the interaction space. The simulation parameters are shown in the figure 1. For a single-beam scheme current value of 2 A leads to the simultaneous excitation of the spurious TE 1,4 mode at the fundamental harmonic (see Fig. 1b). At the same time, single-mode oscillation with the ...

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

Cited by 19 publications

References 24 publications

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

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

Transverse radiation input and output for planar relativistic surface-wave oscillators and amplifiers

Simulations of powerful microwave oscillators with oversized electrodynamics systems

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