Initial operation of a high power, K-band, harmonic gyroklystron for accelerator applications

Experimental studies of amplification and stability in a series of multi-megawatt, 19.7 GHz, second harmonic gyroklystron amplifier tubes suitable for driving future linear supercolliders are reported. Four different two-cavity gyroklystron tubes have been constructed and tested, and each one has exhibited higher power, larger efficiency, and improved stability compared to its predecessor. The latest results include the production of peak output powers in excess of 29 MW, at an efficiency of 27% and a gain of 25 dB.<>