Production of high-amplitude waves by a relativistic beam in a slow-wave system

An exact solution to the nonlinear kinetic equation is used to examine the limiting states arising in a slow-wave system with beam generation of harmonic waves. The limiting current for single-mode generation is estimated. Efficient energy transfer from the beam to the wave is possible only for a relativistic beam in a slow-wave system. The choice of optimal parameters is discussed for generating waves in a specified wavelength range.