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Millimeter wave amplification in a free electron laser with a focusing wiggler

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10 Author(s)
Sakamoto, K. ; Department of Fusion Engineering Research, Japan Atomic Energy Research Institute, Naka‐machi, Ibaraki 311‐01, Japan ; Kobayashi, T. ; Kawasaki, S. ; Kishimoto, Y.
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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.

Published in:

Journal of Applied Physics  (Volume:75 ,  Issue: 1 )