Pao KF, Chang TH, Fan CT, Chen SH, Yu CF, Chu KR. Dynamics of mode competition in the gyrotron backward-wave oscillator.
Phys Rev Lett 2005;
95:185101. [PMID:
16383909 DOI:
10.1103/physrevlett.95.185101]
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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.
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