Generation of spatially coherent radiation in free-electron masers with two-dimensional distributed feedback

Аржанников, А. В.; Zaslavskiĭ, V. Yu.; Ivanenko, V.G.; Иванов, И. А.; Kalinin, P. V.; Kuznetsov, A.; Kuznetsov, S. A.; Peskov, N. Yu.; Sergeev, A. S.; Sinitskii, S. L.; Stepanov, V. D.

doi:10.1134/s0021364008110052

Cited by 38 publications

(15 citation statements)

References 7 publications

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“…13 Similarly to FEM with 2D distributed feedback, [14][15][16][17] these gratings allow organizing additional transverse (with respect to the translational velocity of the electrons) electromagnetic energy fluxes that synchronize the radiation from wide sheet electron beams. Correspondingly, in order to provide the transverse coherence of radiation, one should use the grating with a following profile (Fig.…”

Section: Surface-wave Oscillators With Two-dimensional Periodic Smentioning

confidence: 99%

“…However, in the case when the beam width substantially exceeds the wavelength, we suggest a more effective mechanism for provision of transverse radiation coherence based on the improved version of the slow-wave structure, namely, a double periodic grating. 13 Similarly to free electron masers (FEMs) with 2D distributed feedback, [14][15][16][17] these gratings allow organizing additional transverse (with respect to the translational velocity of the electrons) electromagnetic energy fluxes that synchronize the radiation from wide sheet electron beams (Fig. 1(c)).…”

Section: Introductionmentioning

confidence: 98%

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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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Section: Surface-wave Oscillators With Two-dimensional Periodic Smentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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

2013

Self Cite

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“…Experimental studies of the planar FEM with 2-D distributed feedback were performed based on the high-current accelerator "ELMI" (BINP, RAS, Novosibirsk) [14]. A sheet relativistic electron beam with a transverse cross section of 0.4 × 7 cm, an electron energy of 0.8 MeV, and a current of up to 3 kA was generated in a sheet vacuum magnetoinsolated diode and transported in a strong (up to 1.4 T) guided magnetic field inside a planar vacuum channel with a cross section of 0.95 × 10 cm.…”

Section: Modeling and Experimental Studies Of Planar 75-ghz Fem Wmentioning

confidence: 99%

Production of Powerful Spatially Coherent Radiation in Planar and Coaxial FEM Exploiting Two-Dimensional Distributed Feedback

Arzhannikov

Cross

et al. 2009

IEEE Trans. Plasma Sci.

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Two-dimensional distributed feedback is an effective method of producing ultrahigh-power spatially coherent radiation from an active medium, that is spatially extended along two coordinates, including relativistic electron beams with sheet and annular geometry. This paper describes the progress in the investigations of planar and coaxial free-electron masers (FEMs) based on a novel feedback mechanism. The theoretical analysis of these FEM schemes was conducted in the frame of the coupled-wave approach and 3-D simulations and agrees well with the experimental data obtained in "cold" and "hot" tests. As a result, the effective transverse (azimuthal) mode selection has been demonstrated under a transverse size of about 20-25 wavelengths, and narrow-frequency multimegawatt microwave pulses have been generated in the Ka-and W-bands.Index Terms-Free-electron maser (FEM), mode selection, powerful microwave radiation, 2-D distributed feedback.

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“…Recently, much attention has been paid to the coaxial Bragg structures due to their attractive peculiarities compared to the planar and cylindrical Bragg structures. 4, [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] In our previous work, 30 we employed single-mode approach to analyze a tapered coaxial Bragg structure, which operates in lower-order mode (TE 1,1 ) at low frequency (15 GHz). Since higher-order mode is required when the device operates at high frequency and in this case multi-mode coupling should be taken into account, we shall go further step to examine the influence of the ripple taper on the higher-order modes interaction with multi-mode coupling operating at terahertz frequency.…”

Section: Introductionmentioning

confidence: 99%

Effect of ripple taper on band-gap overlap in a coaxial Bragg structure operating at terahertz frequency

Ding

2012

Physics of Plasmas

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Based on the mode-coupling method, numerical analysis is presented to demonstrate the influence of ripple taper on band-gap overlap in a coaxial Bragg structure operating at terahertz frequency. Results show that the interval between the band-gaps of the competing mode and the desired working mode is narrowed by use of positive-taper ripples, but is expanded if negative-taper ripples are employed, and the influence of the negative-taper ripples is obviously more advantageous than the positive-taper ripples; the band-gap overlap of modes can be efficiently separated by use of negative-taper ripples. The residual side-lobes of the frequency response in a coaxial Bragg structure with ripple taper also can be effectively suppressed by employing the windowing-function technique. These peculiarities provide potential advantage in constructing a coaxial Bragg cavity with high quality factor for single higher-order-mode operation of a high-power free-electron maser in the terahertz frequency range.

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Generation of spatially coherent radiation in free-electron masers with two-dimensional distributed feedback

Cited by 38 publications

References 7 publications

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

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

Production of Powerful Spatially Coherent Radiation in Planar and Coaxial FEM Exploiting Two-Dimensional Distributed Feedback

Effect of ripple taper on band-gap overlap in a coaxial Bragg structure operating at terahertz frequency

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