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We present development progress for a 233 GHz hybrid serpentine waveguide TWT amplifier employing microfabrication techniques based on UV-LIGA. Maximum output power from the circuit is predicted to exceed 140 W from a 20 kV, 124 mA electron beam. Updates include progress of the circuit microfabrication and testing, window tuning, and electron gun.
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...
We present the results of experimental measurements on an 18-beam S-band multiple-beam klystron. The electron gun has met its perveance design goal of 4.8 μPerv with very good beam transmission (>97% in the absence of rf). Preliminary rf testing has shown amplification across the full 400-MHz band (2.9 to 3.3 GHz). The MBK was recently re-gunned to correct a high pressure gas issue; further results...
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