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Generation of Spatially Coherent Radiation in Free-Electron Lasers with Two-Dimensional Distributed Feedback

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Radiophysics and Quantum Electronics Aims and scope

Abstract

We study the possibility of using two-dimensional distributed feedback (DF) to generate spatially coherent radiation of ribbon and hollow relativistic electron beams whose transverse dimensions exceed the wavelength by several orders of magnitude. Such a feedback can be realized in planar and coaxial two-dimensional Bragg resonators with a two-period corrugation of their side walls. This corrugation gives rise to additional transverse (with respect to the reciprocal motion of the electrons) fluxes of electromagnetic energy which synchronize emission from different parts of the electron beam. Simulations of the onset of autooscillations in free-electron lasers (FELs) with a two-dimensional DF show the possibility of obtaining single-mode monochromatic coherent generation by beams with transverse dimensions up to 102-103 wavelengths. We also analyze the use of hybrid resonators composed of “two-dimensional” input and “one-dimensional” output Bragg mirrors. In such a scheme, the “two-dimensional” mirror ensures synchronization of the emission perpendicular to the electron beam, while reflection from the output “one-dimensional” mirror is sufficient for the self-excitation of the generator. In the case of a system closed in the transverse direction, such a scheme permits one to reduce significantly the ohmic losses resulting from the electromagnetic fluxes locked in the transverse direction. It is shown that the two-dimensional DF can also be used to synchronize radiation in a multibeam generator consisting of planar FEL modules fed by a ribbon electron beam and coupled via the transverse electromagnetic-energy fluxes which are formed by two-dimensional Bragg structures. The experimental studies aimed at realization of ultrahigh-power FELs with a two-dimensional DF are discussed.

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Authors and Affiliations

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

    N. S. Ginzburg, N. Yu. Peskov & A. S. Sergeev

  2. Budker Institute of Nuclear Physics of the Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia

    A. V. Arzhannikov & S. A. Sinitsky

Authors
  1. N. S. Ginzburg
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  2. N. Yu. Peskov
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  3. A. S. Sergeev
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  4. A. V. Arzhannikov
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  5. S. A. Sinitsky
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Ginzburg, N.S., Peskov, N.Y., Sergeev, A.S. et al. Generation of Spatially Coherent Radiation in Free-Electron Lasers with Two-Dimensional Distributed Feedback. Radiophysics and Quantum Electronics 44, 494–512 (2001). https://doi.org/10.1023/A:1017909616624

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