Generation of spatially coherent radiation in free-electron masers with two-dimensional distributed feedback
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- Arzhannikov, A.V., Ginzburg, N.S., Zaslavskii, V.Y. et al. Jetp Lett. (2008) 87: 618. doi:10.1134/S0021364008110052
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The results of theoretical and experimental studies on the generation of spatially coherent electromagnetic radiation in a planar free-electron maser with two-dimensional distributed feedback are reported. A two-dimensional Bragg structure is used at the initial part of the interaction space to ensure the transverse synchronization of the radiation. The possibility of the narrowband generation in the 75-GHz frequency band is demonstrated experimentally for a sheet kiloampere electron beam whose width is 20 times larger than the wavelength.