Abstract
Improved amplifier performance of the NRL Ku-band ubitron is reported following several experimental modifications. The major modification is the substitution of a higher-current (100 A), higher-quality electron gun for the original modified SLAC klystron gun (250 kV, 37 A). The experimental configuration is otherwise unchanged: a solid, uniform-density electron beam propagating through a helical wiggler/axial guide field configuration, interacting with a co-propagating circularly polarized TE 11 rf wave. With these changes, small-signal gains of 23 dB have been observed in the 12.6–17.5 GHz frequency range. Good agreement between measured and calculated gain in the Raman regime has been obtained using a three-wiggler model in the 3D nonlinear FEL code ARACHNE.
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