Dynamics of mode competition in the gyrotron backward-wave oscillator

K. F. Pao, T. H. Chang, C. T. Fan, S. H. Chen, C. F. Yu, K. R. Chu

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Abstract

The axial modes of the gyrotron backward-wave oscillator (gyro-BWO) each exhibit a distinctive asymmetry in axial field profile. As a result, and in sharp contrast to the behavior of the familiar resonator-based gyrotron oscillator, particle simulations of the gyro-BWO reveal a radically different pattern of mode competition in which a fast-growing and well-established mode is subsequently suppressed by a later-starting mode with a more favorable field profile. This is verified in a Ka-band experiment and the interaction dynamics are elucidated with a time-frequency analysis.

Original languageEnglish
Article number185101
JournalPhysical Review Letters
Volume95
Issue number18
DOIs
StatePublished - 28 Oct 2005

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