Free Electron Laser in a Stripline Geometry

A thin dielectric slab over a conducting sheet is a low-loss slow-wave guiding system. When one introduces a magnetic wiggler into the system one may efficiently excite millimeter waves by passing a sheet electron beam just above the dielectric surface. For realistic parameters, the energy requirements on the beam are greatly reduced due to the wiggler. The frequency u, and the growth rate G are very sensitive to beam energy. G scales as l'h Bl with beam current Ih and wiggler strength Bo and decreases with increasing width of the dielectric and increasing u,.