Conclusion
Mode competition — interaction between a mode and another mode — is due to the non-linearity of the relativisitc factor γ. At the beginning of a multimode oscillating, the behavior of the multimode oscillating is only dependent on the ratio of mode frequency and relativistic cyclotron frequency and is in agreement with that described by single mode theory. In non-linear domain mode interaction depends on both amplitudes of A1 and A2 and phase difference Δi of the two modes. The main effect of mode interaction is that excitation of the parasitic mode suppresses growth of the operating mode.
Under the operating conditions with high efficiencies, a mode interaction between the dominant mode and the lower lateral mode is almost unavoidable, especially in the gyrotron operating with a cavity at higher order modes to increase the capability of output power.
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A research fellow of the Alexander von Humboldt Foundation coming from Beijing Vacuum Electron Devices Research Institute, Beijing, China
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Zhu, M., Döring, H. Mode competition of the gyrotron under high efficiency operating conditions. Int J Infrared Milli Waves 7, 653–672 (1986). https://doi.org/10.1007/BF01013283
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DOI: https://doi.org/10.1007/BF01013283