Dynamics of mode competition in the gyrotron backward-wave oscillator |
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Authors: | Pao K F Chang T H Fan C T Chen S H Yu C F Chu K R |
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Institution: | Department of Physics, National Tsing Hua University, Hsinchu, Taiwan. |
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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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