Abstract
The Naval Research Laboratory ubitron (a low voltage free electron laser) amplifier experiment is nearing operation. The experiment has been designed to explore the potential of the ubitron as an efficient, high power radiation source. The initial experimental configuration consists of a modified SLAC klystron gun, “turnstile” rf input coupler, double taper bifilar helix wiggler, rf output monitor, and an rf calorimeter/load, and has been designed to operate in the collective FEL mode. The results of component cold testing will be presented along with the calculated performance of the amplifier. In particular, a new rf input coupler design has demonstrated reasonable coupling efficiency over the design bandwidth with the ability to control the polarization of the input wave. Detailed comparison of experimental results with a recently developed 3-D ubitron theory will allow an accurate assessment of the ubitron as a millimeter- and submillimeter-wave source.
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