A free electron laser (FEL) with a dielectric-loaded waveguide operating in undulator (multiple mirror) field is analyzed. The stability properties are investigated self-consistently on the basis of the linearized Vlasov-Maxewll equations. Using appro...
A free electron laser (FEL) with a dielectric-loaded waveguide operating in undulator (multiple mirror) field is analyzed. The stability properties are investigated self-consistently on the basis of the linearized Vlasov-Maxewll equations. Using appropriate boundary conditions a dispersion relation is derived in the low density approximation and is numerically solved. In the case of the short wiggler wavelength mode, the frequency of FEL is greatly enhanced in mildly relativistic electron beam with the appropriate choices of physical parameter values. Therefore, the intense submillimeter microwave might be produced by making use of a mildly relativistic electron beam. A wide band free electron laser amplifier is also possible by the proper choice of the external parameters, such as wiggler wavenumber, dielectric constant, and beam energy.