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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...
We report the first experimental studies of picosecond pulse amplification and broadening in a gyrotron amplifier. These studies allow investigation of the amplification process in a new physical regime, where wave dispersion and finite gain bandwidth play a major role. The experiments were performed on a 140 GHz gyro-traveling wave tube (Gyro-TWT) operating in a higher order mode of a confocal waveguide...
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