We study the possibility of using Bragg resonators that implement a three-dimensional distributed feedback mechanism ensuring synchronization of radiation and mode selection under conditions of substantial oversize in three spatial coordinates. To describe the electron–wave interaction in devices of this type, a three-dimensional spatiotemporal averaged model was developed within the framework of the coupled wave approach. On this basis, a planar free-electron maser (FEM) driven by a full-scale electron beam of a sheet configuration with a particle energy of 1 MeV, a current of up to 140 kA, and a cross section of about 1 × 140 cm, which is formed using a high-current accelerating complex U-2 (BINP RAS), was simulated. The possibility of achieving a stable narrow-band oscillation regime in FEMs with a multi-gigawatt power level in the W band with transverse sizes of the proposed resonators from tens to hundreds of radiation wavelengths is demonstrated.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 66, Nos. 7–8, pp. 575–584, July–August 2023. Russian DOI: https://doi.org/10.52452/00213462_2023_66_07_575
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Peskov, N.Y., Egorova, E.D., Ginzburg, N.S. et al. High-Power Spatially Extended Free-Electron Masers with Three-Dimensional Distributed Feedback. Radiophys Quantum El (2024). https://doi.org/10.1007/s11141-024-10312-z
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DOI: https://doi.org/10.1007/s11141-024-10312-z