Abstract
Operation of a ubitron/FEL amplifier with a helical wiggler/axial guide field configuration in the frequency band from approximately 13 to 18 GHz is reported. The experiment employs a 190–250 keV electron beam with currents up to 37 A, and has been operated using the fundamental wiggler harmonic interaction with the TE 11 circular waveguide mode. The wiggler is a bifilar helix with a 2.54 cm period and a total length of 50 cm, and is capable of achieving an amplitude of 575 G or more in pulsed mode. The wiggler is flared both on entry and exit in order to obtain smooth transitions in the beam trajectory with 12 periods of uniform amplitude. Small signal gains as high as 17–19 dB have been observed, corresponding to a gain per free-space wavelength approaching 1.25 dB/λ. The experimental results are in reasonable agreement with nonlinear simulation of the interaction in the Raman regime.
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