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Description
We investigate the radiation from a pair of electron bunches moving along the cylindrical waveguide axis, assuming that the waveguide is partially loaded by a medium with periodic dielectric permittivity. The results of numerical calculations are presented in the special case of layered medium consisting of a finite number (2-4) of dielectric plates separated by vacuum gaps. We show that under certain conditions on the problem parameters the quasi-coherent radiation generated inside the plates is self-amplified at certain waveguide modes. The possibility of observing this phenomenon at the AREAL accelerator is discussed, and a preliminary experimental setup is presented.
The work was partially supported by the Science Committee of RA, in the frames of the research projects № 21AG-1C069 and 24AA-1C050.