STIMULATED RAMAN-SCATTERING OF AN EH WAVE-GUIDE MODE NEAR CYCLOTRON-RESONANCE

The stimulated backscattering of a predominantly transverse magnetic waveguide mode off of a space-charge wave in a plasma-filled waveguide is investigated. A formula is derived for the growth rate of the backscattered wave and scatterer wave with the pump wave frequency near the electron cyclotron frequency. A numerical study indicates that the phase-matching conditions permit the approach to cyclotron resonance with substantial enhancement of the growth rate. Possible use of the EH waveguide mode as a pump for a free electron laser is discussed.