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The U.S. Naval Research Laboratory has been developing a novel UV-LIGA process to create amplifier circuits from 100 GHz through the THz. A 670 GHz EIK ladder test piece has been successfully fabricated with a 0.004 inch diameter beam tunnel, and demonstrates sub-micron fabrication accuracies. The technique is being extended to showcase capabilities at 850 GHz, and 1.03, 1.35 and 1.50 THz.
The design and implementation of Ka-band three-beam cascaded serpentine travelling-wave tube (TWT) amplifiers are presented. In the multiple-beam cascaded TWT concept1, the RF output from each interaction circuit stage is serially connected to the input of the next stage, with each stage driven by a separate electron beam. This configuration provides flexibility for gain, bandwidth, and power trade-offs...
The design of a Ka-band three-beam cascaded serpentine travelling-wave tube (TWT) amplifier is presented. Simulations predict that a peak power of 3.5 kW with saturated gain of 16 dB and an instantaneous bandwidth of 30% can be achieved in a circuit length of ≤ 4.5 cm driven by three 20 kV beams with 0.5-A each. A plan for a proof-of-principle experiment will also be discussed.
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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