Dormidontov A. Interaction between charged particles and electromagnetic waves in the cylindrical solid-state structures

The object is the processes of the interaction between moving charged particles and electromagnetic fields in electrodynamic systems with cylindrical solid-state structures. The research purpose is to establish physical phenomena and physical laws that occur when the field reactions of charged particles moving nearby surfaces of the cylindrical solid-state structures. The research methods are based on the general theory of the electromagnetic field and the apparatus of the mathematical physics for solution of the boundary-value problems. Experimental investigations were executed at the high-current electron accelerator “Temp-A” of NSC KIPT. The scientific novelty is a further development of field theory of eigenmodes and forced oscillations in the quasi-optical cylindrical solid-state structures and solution of construction problem of the electromagnetic millimeter range radiation source using the high quality factor cylindrical dielectric resonators. The mechanisms of an excitation of an electromagnetic eigenwaves in conditions of Cherenkov and gyrosynchrotron resonances in such systems have been analyzed in the work. Expressions for the energy loss by a charge moving along a spiral trajectory in an external magnetic field have been obtained and it is shown that they are multi-purposes. They allow to determine the energy loss by both a rotational particle and a translational motion particle, as well as by a charged ring that surrounds a cylinder. The conditions for the excitation of surface and bulk-surface eigenwaves of solid-state cylinder have been obtained. For the first time the nonreciprocity effect for an excitation of 3D+2D plasma (3D plasma) cylinder eigenwaves with identical field distribution, but with different propagation directions along the azimuthal coordinate has been found. First, a possibility of an exciting of the whispering gallery waves and a selection of the operating mode in the cylindrical dielectric resonator by an azimuthal-periodic electron beam was demonstrated and validated. The field of application is radiophysics, physical electronics and theoretical physics.