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We report results on the design, fabrication, and test of an improved circuit for a pulsed, 140 GHz, 1 kW gyro-amplifier. The new confocal waveguide circuit features improved mechanical construction, input coupling into the higher-order operational mode, and sever design. The goal is increased gain, bandwidth, and output power. Numerical simulations of the gain and preliminary experimental results...
The design of a 250 GHz gyrotron traveling wave amplifier for nanosecond pulses with gain exceeding 50 dB is presented. The amplifier uses a novel photonic band gap (PBG) interaction circuit. The PBG interaction structure confines a TE03-like mode with comparable interaction efficiency to a circular waveguide, while providing lower-order mode suppression and distributed loss along the entire interaction...
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