A second-harmonic TE,, gyro-TWT is being constructed at UCD that is predicted tu produce 50 kW in Ka-band with 20% efficiency, 30 dB saturated gain and 3% bandwidth. The device utilizes a novel Northrop GNmman cusp gun that provides a high quality axis-encircling electron beam. The axis-encircling beam from the cusp gun provides a significantly more efficient gyrotron interaction for harmonic operation than a non-axis-encircling beam from a magnetron injection gun (MIG) because the electrons are nut constrain…
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