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Investigation of Mode Interaction in Harmonic Sub-THz Gyrotron

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Abstract

Within the frame of a non-stationary self-consistent model, we have investigated the regimes of simultaneous oscillations at two different modes, which are resonant with the first and second cyclotron harmonics of electron oscillations, respectively. Simulations were carried out for parameters of a sub-THz gyrotron developed at FIR UF (Fukui, Japan). It was shown that the hard self-excitation at the second cyclotron harmonic is possible in the presence of generation at the first one. Simulations also predict the possibility of simultaneous generation at two harmonics in the excitation zone of the second harmonic modes at relatively high beam currents. Furthermore, it was demonstrated that in this case, the axial structure of the generated field can vary in the process of nonlinear interaction.

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Data are available on request from the authors.

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Acknowledgements

The authors are grateful to Prof. G.S. Nusinovich for his interest in this work, stimulating discussions, and numerous valuable comments.

Funding

The work was supported by the Russian Science Foundation Project No. 19–12-00141.

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Authors and Affiliations

  1. Institute of Applied Physics RAS, Nizhny Novgorod, Russia

    M. Glyavin, A. Gashturi, A. Malkin, A. Sergeev, I. Zheleznov & I. Zotova

  2. Research Center for Development of Far-Infrared Region, University of Fukui, Fukui, Japan

    Y.Tatemtsu

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  1. M. Glyavin
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  2. A. Gashturi
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  3. A. Malkin
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  4. A. Sergeev
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  5. I. Zheleznov
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  6. Y.Tatemtsu
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  7. I. Zotova
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Correspondence to M. Glyavin.

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Glyavin, M., Gashturi, A., Malkin, A. et al. Investigation of Mode Interaction in Harmonic Sub-THz Gyrotron. J Infrared Milli Terahz Waves 42, 843–850 (2021). https://doi.org/10.1007/s10762-021-00818-2

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