Abstract
To realize spatial coherent radiation of ribbon relativistic electron beams with the transverse dimension essentially exceeding the wavelength, we propose the use of a 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. Eigenmodes of the 2D Bragg resonator are found and its high selectivity is proved.
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