EMISSION OF AN INTENSE ELECTROMAGNETIC-FIELD IN A PLASMA-LOADED-WIGGLER FREE-ELECTRON DEVICE

The use of a plasma-loaded-wiggler free electron device to generate te rahertz intense electromagnetic waves is analyzed. The interaction amo ng the beam (B), the space charge mode (L), the wiggler (W), and the e lectromagnetic field (S) is through the simultaneous operation of the Raman (LWS) and the free electron laser (BWS) interactions warranted b y having the phase velocity of the space charge beam-plasma mode equal to the free electron laser resonant beam velocity. The high-frequency space charge mode, with low beam-plasma density ratio, is generated p rincipally by the ponderomotive force of the wiggler and the electroma gnetic field through LWS coupling. On the other hand, the coupling of the space charge field and the wiggler provides the LWS channel to dri ve the electromagnetic field. Also, the interaction of the electron be am with the wiggler amounts to the BWS channel of driving the electrom agnetic field. The electron beam in this LBWS four-entity interaction is represented by either a fluid model or a single-particle model. The results of these two models are compared and discussed. [S1063-651X(9 8)12910-0].