The cold quality Qcold for magnicon on resonator in the rotating TMn10 mode

Cold quality Qcold is an important parameter in microwave electronic tube design. Magnicon works in a rotrating TMn10 mode in the cylindracl cavity, its field distribution is different from the static state. But up to now researchers simply assume its cold quality to be two times of the static one, which usually results in big errors. Here in this paper, based on the rotating field distribution, and using the integrated Bessel function, we deduced the cavity’s storage and the rotating field dissipated power expressions, and obtained a modified cold quality formula for rotating TMn10 mode in the magnicon, which shows a good agreement with the experimental data.