A NOVEL SMALL-PERIOD WIGGLER FOR FREE-ELECTRON LASERS

A novel small-period wiggler configuration constructed by sheet of bifilar-helix with ferro-core for free-electron lasers is proposed. The performance characteristics of the wiggler prototype with 10mm period are measured. The field as high as 500G to 1kG have been obtained. The amplifier designs for operation at 190 GHz using modest electron beam energies in the range of 400-500 keV are presented.