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In any TWT design, understanding of potential spurious oscillation characteristics is critical to achieve optimal amplifier performance and, more importantly, to avoid the unpleasant surprise of discovering problems after the fact. This paper serves to illustrate these oscillation characteristics and to discuss potential mitigation approaches with special emphasis on serpentine/folded-waveguide TWTs...
Progress on the demonstration of a high power broadband three-beam Ka-band cascaded traveling-wave tube (TWT) prototype is presented. The amplifier will be driven by an electron gun (0.6 A × 3, 20 kV) adapted from our 18-beam multiple-beam klystron gun design. Both serpentine and folded-waveguide versions of the cascaded-TWT have been evaluated. The expected peak RF output power is 4.5 kW with 100...
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