Analysis of Promising Modificationsof Relativistic Generators with Virtual Cathode

This work is devoted to the analysis of promising schemes of vircators. The results of numerical simulation and analysis of the following schemes are presented: multibeam scheme of a vircator - such a scheme can be considered as promising for further increasing the power and frequency of the generators with virtual cathode; relativistic vircator with elliptic resonator - it is shown that the elliptical type of the resonator makes it possible to provide a better efficiency of the interaction of the relativistic electron beam and the electromagnetic field; relativistic vircator with a photonic crystal - analysis of the simulation results has shown high generation efficiency when using a photonic crystal structure, in comparison with the classical scheme of an axial vircator.