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Design techniques and experimental results are presented on a Ku-band ${\rm TE}_{11}$ mode gyro-traveling wave tube. The hot test of this amplifier gives more than 153-kW output power, 2.3-GHz bandwidth (14%), 41-dB saturated gain, and 20% efficiency driven by a 63 kV, 12-A electron beam with a pitch angle $({\rm v}_{t}{\rm v}_{z})$ of 1.2, and velocity spread of 5%. A linear polarized ${\rm TE}_{11}$ ...
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