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A 220 GHz, 50 W vacuum electron serpentine waveguide amplifier is under development utilizing an 11.7 kV, 120 mA electron beam. The amplifier showcases a novel microfabrication technique employing embedded polymer monofilaments to simultaneously fabricate the circuit and beam tunnel in a single UV-LIGA step [1] (U.S. Provisional Patent Application filed). The method shows promise for fabricating beam...
We discuss the design and implementation of a waveguide coupler for a sheet-beam coupled-cavity structure. Discussion includes excitation of the fundamental mode with low VSWR, wide bandwidth, circuit sensitivity, and tuning. We conclude with a comparison with round-beam structure, and experimental results of sheet beam coupler.
Summary form only given. An 18-beam, seven-cavity multiple-beam klystron ("MBK3") has been developed at the Naval Research Laboratory and is designed to produce a peak rf output power of >500 kW over a 400-MHz frequency band centered at 3.1 GHz. The amplifier operates in the TM01 fundamental mode, with the 18 beamlets clustered around the axis of the device in two concentric rings of...
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