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Large Power Increase Enabled by High-Q Diamond-Loaded Cavities for Terahertz Gyrotrons

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Abstract

A new operation scheme is proposed to enable large increase in output power of terahertz gyrotrons. In this scheme, the gyrotron operates in weakly attenuated dielectric modes supported by a conventional metal cavity, which is loaded with a coaxial rod made of ultralow-loss CVD diamond. Along with high ohmic Q values, these modes are shown to possess rather strong beam-wave coupling, which ensures high interaction efficiency. As an example, the CVD diamond loading is applied to the cavity of the 527-GHz gyrotron developed at the Massachusetts Institute of Technology (MIT). The output power of this gyrotron operated in the high-Q dielectric mode is found to reach 140 W, compared to 15 W for the conventional-cavity tube. Using the coupled-mode approach, a new design is presented for a high-Q diamond-loaded cavity of the 527-GHz gyrotron. The designed cavity is shown to provide a high-purity transformation of the operating dielectric mode to the outgoing mode of the hollow exit waveguide. The output mode can be extracted from the gyrotron using a standard output system and attains a peak power of 171 W, which is more than 11 times higher than that of the 527-GHz gyrotron with a conventional cavity. The robustness of gyrotron performance against errors in manufacturing of the diamond-loaded cavity is discussed.

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Data are available from the authors upon reasonable request.

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Acknowledgements

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

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, Ioannis Gr. Pagonakis, Manfred Thumm & John Jelonnek

  2. 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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  2. Konstantinos A. Avramidis
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by VIS. The first draft of the manuscript was written by VIS, and all authors commented on previous versions of the manuscript. The authors read and approved the final manuscript.

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Correspondence to Vitalii I. Shcherbinin.

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Shcherbinin, V.I., Avramidis, K.A., Pagonakis, I.G. et al. Large Power Increase Enabled by High-Q Diamond-Loaded Cavities for Terahertz Gyrotrons. J Infrared Milli Terahz Waves 42, 863–877 (2021). https://doi.org/10.1007/s10762-021-00814-6

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