Abstract
To realize spatially coherent radiation from a sheet relativistic electron beams with transverse dimensions essentially exceeding the wavelength, we propose the use of two-dimensional distributed feedback. This feedback can be provided in a Bragg resonator formed by two double-periodic corrugating metal plates, when additional transverse electromagnetic energy fluxes that synchronize the radiation of individual parts of the electron beam take place. It is found that eigenmodes of a 2-D Bragg resonator and proved its high selectivity. Numerical simulation of excitation of a 2-D Bragg resonator by sheet relativistic electron beam and oscillation build-up demonstrates the possibility to provide spatially coherent radiation to a beam of width 102 – 103 wavelengths. The concept of superpower FEL (P ≃ 20 GW ) in the millimeter wave range is discussed.
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