The development of a 10-kW average power, 94-GHz gyroklystron amplifier is
described. This average power was obtained with 11% radio frequency (RF) du
ty factor and 92-kW peak power in the TE01 circular cavity mode. ThC instan
taneous bandwidth was 420 MHz, and the efficiency was 33.5%. Low-duty-facto
r testing also yielded a peak power of as much as 115 kW with 600-MHz insta
ntaneous bandwidth. This development effort was carried out over the past t
hree years and represents record average power performance in an amplifier
at this frequency.