Resonant second harmonic generation of a millimeter wave in a plasma filled waveguide

A plasma filled waveguide, immersed in a helical wiggler magnetic field, is suitable for resonant second harmonic generation of a millimeter wave. The wiggler provides the additional momentum required for the generation of ha rmonic photons. The millimeter wave induces oscillatory electron velocity t hat couples with the wiggler to produce density oscillations. These oscilla tions in conjunction with the oscillatory velocity produce a nonlinear curr ent driving the resonant second harmonic. The wiggler introduces an azimuth al assymetry in the second harmonic held. The power conversion efficiency s cales as the square of wiggler amplitude, electron density and oscillatory electron velocity.