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Mode Discrimination by Lossy Dielectric Rods in Cavities of Second-Harmonic Gyrotrons

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Abstract

The influence of a coaxial dielectric rod on eigenvalues, ohmic losses, transverse field structure, and beam-wave coupling coefficients is investigated for TE modes of a gyrotron cavity. It is shown that such dielectric insert, when made from a moderate-loss material, results in strong attenuation of all cavity modes, with the exception of those having caustic radii much larger than the insert radius. It is proposed to employ such dielectric loading for selective suppression of competing modes in cavities of second-harmonic gyrotrons. The high performance and flexibility of the proposed method of mode discrimination are demonstrated for the example of the cavity of the high-power 0.39-GHz second-harmonic gyrotron developed at the University of Fukui. In addition, some fascinating capabilities enabled by coaxial inserts made of ultralow-loss dielectrics are discussed.

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Acknowledgments

The work of Vitalii I. Shcherbinin was supported by the Georg Forster Research Fellowship for Experienced Researchers from the Alexander von Humboldt Foundation.

Data Availability

Data are available from the authors upon reasonable request.

Funding

Partial financial support was received from the Alexander von Humboldt Foundation.

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Authors and Affiliations

  1. Institute for Pulsed Power and Microwave Technology, Karlsruhe Institute of Technology, 76131, Karlsruhe, Germany

    Vitalii I. Shcherbinin, Konstantinos A. Avramidis, Manfred Thumm & John Jelonnek

  2. SPE “Renewable Energy Sources and Sustainable Technologies”, National Science Center “Kharkiv Institute of Physics and Technology”, Kharkiv, 61108, Ukraine

    Vitalii I. Shcherbinin

  3. Institute of Radio Frequency Engineering and Electronics, Karlsruhe Institute of Technology, 76131, Karlsruhe, Germany

    Manfred Thumm & John Jelonnek

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  1. Vitalii I. Shcherbinin
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Shcherbinin, V.I., Avramidis, K.A., Thumm, M. et al. Mode Discrimination by Lossy Dielectric Rods in Cavities of Second-Harmonic Gyrotrons. J Infrared Milli Terahz Waves 42, 93–105 (2021). https://doi.org/10.1007/s10762-020-00760-9

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