SLOTTED 3RD-HARMONIC GYRO-TWT AMPLIFIER EXPERIMENT

The first operation of a slotted third-harmonic gyrotron traveling-wav e amplifier is reported, The low-magnetic-field moderate-voltage gyrot ron amplifier's 62-keV 2.5-A upsilon(perpendicular to)/upsilon(paralle l to) = 1.2 axis-encircling electron beam was supplied by a gyroresona nt RF accelerator, The 10-GHz 1.3-kG single-section slotted third-harm onic amplifier is stable and yielded 12.5 dB of small-signal gain with a bandwidth of 2.5%, The experiment was performed as a scaled proof-o f-principle test of the 95-GHz multisection slotted amplifier under de velopment at CPI (formerly Varian).