Improving selectivity of free electron maser with 1D Bragg resonator using coupling of propagating and trapped waves

Ginzburg, N. S.; Malkin, A. M.; Peskov, N. Yu.; Sergeev, A. S.; Kaminsky, A. K.; Sedykh, S. N.; Perel'shtein, E.A.; Sergeev, A. P.; Elzhov, A. V.

doi:10.1103/physrevstab.8.040705

Cited by 29 publications

(14 citation statements)

References 6 publications

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“…The modeling of nonstationary equations (5), (9), and (11) demonstrates that single-frequency oscillation regimes can be established with moderate exceedings over the threshold. Figure 2 shows the onset of the stationary oscillation regime and the spatial distribution of the field amplitudes of partial waves in this regime for L 1 = 0.6, L 0 = 3.4, and L 2 = 0.2, which corresponds to the above-mentioned resonator geometry.…”

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confidence: 98%

“…resonators based on traveling and quasi-critical wave coupling [9,10]. In such an FEM scheme, the electron beam under the conditions of large Doppler frequency up-conversion amplifies the co-propagating wave, which is coupled by the Bragg structure with a quasi-critical wave that ensures the oscillator self-excitation and the transverse-index mode selection.…”

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confidence: 99%

“…The initial and boundary conditions for Eqs. (5), (9), and (11) are specified as follows. Assuming that the electromagnetic energy fluxes are absent outside, the amplitudes of the partial waves are equal to zero at the corresponding boundaries of a hybrid resonator:…”

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Short-wave sectioned free-electron masers with Bragg resonators based on the traveling and quasi-critical wave coupling

Zaslavsky

Zotova

Malkin

et al. 2009

Radiophys Quantum El

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We consider the possibility of implementation of a free-electron maser with a two-mirror resonator composed of modified and conventional Bragg mirrors, operated in the short-wave part of the millimeter-wave range. The use of a modified Bragg mirror based on the traveling and quasicritical wave coupling at the input of the interaction space permits the transverse-index selection of modes. Amplification of the synchronous co-propagating wave by an electron beam is reached mainly in the regular part of the resonator. Even slight reflections from the conventional output Bragg cavity, which directly couples the co-and counter-propagating traveling waves, turn out to be sufficient for generation of self-excited oscillations. It is shown that the new scheme of a freeelectron maser ensures the oscillation frequency stabilization with respect to the electron-energy variation. With the optimal choice of the parameters, the oscillation frequency is close to the cutoff frequency of a quasi-critical wave excited in the modified Bragg structure.1) The Bragg resonators with two counter-propagating waves coupled by weakly corrugated waveguides, which were proposed in [1-3], are widely used at present in high-power microwave oscillators with curvilinear relativistic electron beams [4][5][6][7][8]. These moderately overdimensional resonators ensure feedback in a relatively narrow frequency range and, simultaneously, form a channel for transport of intense electron beams. Among the sources of this rating, the record-breaking parameters have been obtained in a freeelectron maser (FEM), which was implemented on the basis of an LIU-3000 accelerator in a combined experiment of the Joint Institute for Nuclear Research (JINR, Dubna) and the Institute of Applied Physics of the Russian Academy of Sciences (IAP RAS, Nizhny Novgorod) [8]. Pulses with a peak power of 20 MW, a duration of 200 ns, a pulse repetition rate of up to 1 Hz, and a spectrum width of about 6 MHz, which is close to the theoretical limit, were obtained at a frequency of 30 GHz.One of the main directions of these studies is forwarding of FEMs into the shorter-wave ranges, which requires that the overdimensionality of the operation space is increased with the preservation of the selective properties of the electrodynamical system. Research experience shows that in the traditional variant of a Bragg resonator, the problems with the excitation of different pairs of cylindrical-wavequide modes, which are related to Bragg corrugation and, correspondingly, have different oscillation frequencies, arise even if the resonator has a diameter D ∼ 2λ, where λ is the radiation wavelength. Thus, it becomes a topical problem to increase the selective capabilities of the Bragg resonators. This can be done by using the modified Bragg

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Short-wave sectioned free-electron masers with Bragg resonators based on the traveling and quasi-critical wave coupling

Zaslavsky

Zotova

Malkin

et al. 2009

Radiophys Quantum El

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“…In a cylindrical waveguide with periodical azimuthal radial grooves ( Fig.1) a propagating waveguide mode can be reflected into itself or into modes with different radial indices if the corrugation period p satisfies the Bragg condition [4,5]:…”

Section: Bragg Reflector In Oversized Circular Waveguidementioning

confidence: 99%

Bragg reflection band stop filter for ECE on WEGA

Wagner¹,

Kasparek²,

Leuterer³

et al. 2011

2011 International Conference on Infrared, Millimeter, and Terahertz Waves

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“…As an FEM microwave system capable to provide stable narrow-band operation in strongly oversize interaction space, we proposed high-selective Bragg resonators of the novel type based on the so-called advanced Bragg structures with the feedback loop involving propagating and quasi-cutoff waves [3,4]. To decrease Ohmic losses associated with excitation of cut-off mode it is attractive to use two-mirror resonator scheme with the up-stream advanced Bragg reflector and conventional Bragg reflector with rather small reflectivity as a down-stream reflector (Fig.…”

Section: Introductionmentioning

confidence: 99%

Powerful narrow-band relativistic masers with Bragg resonators operating from mm to sub-mm wavelength band: resent results and prospects

et al. 2017

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Improving selectivity of free electron maser with 1D Bragg resonator using coupling of propagating and trapped waves

Cited by 29 publications

References 6 publications

Short-wave sectioned free-electron masers with Bragg resonators based on the traveling and quasi-critical wave coupling

Short-wave sectioned free-electron masers with Bragg resonators based on the traveling and quasi-critical wave coupling

Bragg reflection band stop filter for ECE on WEGA

Powerful narrow-band relativistic masers with Bragg resonators operating from mm to sub-mm wavelength band: resent results and prospects

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