STABLE 2 MW, 35 GHZ, 3RD-HARMONIC TE41 GYRO-TWT AMPLIFIER

A third-harmonic gyro-TWT amplifier operating in the TE41 mode is desc ribed that is predicted to generate 2 MW at 35 GHz, The device is base d on the proven concept that the electron beam current can be signific antly higher in a stable harmonic gyro-TWT amplifier than at the funda mental due to the comparatively weaker harmonic interaction. For stabi lity, the circuit is sliced to suppress electromagnetic modes without the desired symmetry and the 100 kV, 100 A electron beam from a magnet ron injection gun is placed at the null of the strongest remaining gyr o-BWO mode. The single-stage gyro-TWT is predicted to produce 2 MW wit h 20% efficiency, 30 dB saturated gain and 3.5% constant-drive bandwid th.