Coherent scattering of slow electromagnetic waves by a nonrelativistic electron beam

The generation of 'ultralight' waves of current in a plasma can lead to the emission or scattering of transverse electromagnetic waves. The intensity of scattered signals depends on the transverse dimensions of the scattering volumes and is generally small if the ultralight current waves are generated by the transverse electromagnetic waves. In this paper, it is shown in a theoretical analysis that this effect can be significant in electron beams at ultrahigh frequencies if slow electromagnetic waves with a longitudinal electric field vector component are used to generate the ultralight current waves. The utilization of this effect in microwave devices is discussed.