MILLIMETER-WAVE AMPLIFICATION IN A FREE-ELECTRON LASER WITH A FOCUSING WIGGLER

A mm wave amplifier experiment on a free electron laser was performed using an intense, mildly relativistic electron beam (0.7-0.9 MeV) with a combination of a focusing planar wiggler and a weak additional axial magnetic field in the so-called ''group 1'' region. A beam transport ratio of over 80%, through the whole wiggler length, was realized. In an amplification experiment, a spatial growth rate of 56 dB/m was obtained at a frequency of 45 GHz, and a power saturation was observed at a level of 6 MW, where the total gain was estimated to be 52 dB. It was shown that the off-axis component of the beam contributes considerably to the rf amplification in the focusing wiggler.