X-band high-efficiency relativistic gyrotron

As a result of the theoretical and experimental studies, a relativistic gyrotron with efficiency 50% at power 7 MW or with power 11 MW at efficiency 30% was developed. The full microwave pulse duration was about 6 /spl mu/s, which corresponded to the duration of the voltage-pulse flat top. The regime of periodical, almost 100% depth self-modulation with period 17 ns was observed in the gyrotron with the delayed feedback formed by an additional reflector in the output waveguide.