Abstract
Summary form only given. We report on the status of a very compact, high efficiency harmonic amplifier (HARA) prototype experiment. In this experiment, a 6 kV 200 mA pencil electron beam undergoes circular scanning-modulation inside a short microwave resonator operating in circular polarization at 5.85 GHz. A 35 GHz output cavity operating at the 6th harmonic of the drive frequency is employed to efficiently extract energy from the modulated beam. This device is expected to deliver hundreds of watts of output power at 35 GHz with /spl sim/50% efficiency. We will present cold-test results of the output cavity as well as experimental results of the beam-wave interactions along the entire HARA circuit. The HARA is /spl sim/3-inches long and does not require a beam focusing system. This makes for a very compact and lightweight system which is well suited to applications where size, weight and efficiency are critical.
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