Design of a frequency-doubling, 35-GHz, 1-MW gyroklystron

This paper presents a design of a 1-MW, frequency-doubling, four-cavity gyr oklystron. The input cavity is driven by a 17.5-GHz driver and operates in the transverse electric (TE)(011) mode at the fundamental cyclotron resonan ce, while the buncher, penultimate, and output cavities operate in the TE02 1 mode at twice the signal frequency at the second cyclotron harmonic. The device exhibits about 40% efficiency and 40-dB gain at 1-MW power level wit h a fractional bandwidth exceeding 0.1%, The power-bandwidth product for th is device is on the same order as that of Ka-band gyroklystrons without the frequency doubling feature.