Abstract
The dynamics of axial mode competition in the gyrotron backward‐wave oscillator (gyro‐BWO) has been investigated in theory and experiment. Because of the difference in field‐shaping processes, the axial modes of the gyro‐BWO each exhibit a distinctive asymmetry in field distribution along the axis. Multi‐mode particle simulations and time‐frequency analyses reveal a consistent pattern of axial mode competition in which a fast‐growing and well‐established mode is subsequently suppressed by a slowly‐growing mode with a favorable field profile. This is verified in a Ka‐band gyro‐BWO experiment.
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