The generalized theory of gyro-travelling-wave tubes operating at arbitrary cyclotron harmonics is developed taking into account the transverse drift of electron guiding centres. In the framework of small-signal theory, the dispersion equation is obtained and analysed and a problem of spurious counterpropagating waves excitation is discussed. The results of the large-signal theory are presented, which predict a high efficiency of operation at the first four cyclotron harmonics.
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Nusinovich et al. (1992) studied this question.
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