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Peculiarities of the Mode Spectrum in Free-Electron Masers Based on Oversized Bragg Resonators with a Corrugation Phase Step

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Radiophysics and Quantum Electronics Aims and scope

We study the operating mode splitting caused by interaction of the neighboring Bragg scattering zones in an oversized Bragg resonator with a corrugation phase step, which is operated at the coupled forward and backward waveguide modes with different transverse structures. This effect is described within the framework of the coupled-wave approach using an advanced four-wave model. It is shown that this effect deteriorates the selective properties of the resonator and, finally, restricts the output power and reduces stability of the narrow-band operating regime in the free-electron masers (FEMs) based on such resonators. The results of the theoretical analysis were corroborated by 3D simulations and “cold” electrodynamic tests. Experimental studies of 30-GHz FEMs with the Bragg resonators having different corrugation depths demonstrated the onset of both narrow-band single-mode and multifrequency multimode oscillation regimes in such resonators. The possibility of power enhancement by using passive compression of the FEM output pulse in a double-frequency oscillation regime is discussed.

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Authors and Affiliations

  1. Institute of Applied Physics of the Russian Academy of Sciences, Nizhny Novgorod, Russia

    N. Yu. Peskov, S. V. Kuzikov & A. S. Sergeev

  2. Joint Institute of Nuclear Research, Dubna, Russia

    A. K. Kaminsky, E. A. Perel’shtein & S. N. Sedykh

  3. N. I. Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, Russia

    S. V. Kuzikov

Authors
  1. N. Yu. Peskov
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  2. A. K. Kaminsky
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  3. S. V. Kuzikov
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  4. E. A. Perel’shtein
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  5. S. N. Sedykh
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  6. A. S. Sergeev
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Correspondence to N. Yu. Peskov.

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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 58, No. 10, pp. 829–840, October 2015.

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Peskov, N.Y., Kaminsky, A.K., Kuzikov, S.V. et al. Peculiarities of the Mode Spectrum in Free-Electron Masers Based on Oversized Bragg Resonators with a Corrugation Phase Step. Radiophys Quantum El 58, 745–754 (2016). https://doi.org/10.1007/s11141-016-9647-0

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  • DOI: https://doi.org/10.1007/s11141-016-9647-0

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