Results from a Ku-band second harmonic coaxial gyroklystron

Summary form only given. Investigations into the performance of high-powered gyroklystrons have been pursued for over 14 years at the University of Maryland. Recent results culminated in an 80 MW TE/sub 01/ output signal at 8.57 GHz for 1.3 /spl mu/s. The efficiency of this tube was 32% and the saturated gain was 31 dB. This was the first of a proposed series of coaxial circuits whose powers are to be on the order of 100 MW. This presentation will describe in detail the experimental results and the outcome of this work. It will also detail any planned and completed efforts to improve performance from this initial second harmonic tube. In addition, experimental work intended on customizing the system to power a small accelerator will be presented.