We describe the concept of a subterahertz gyrotron with frequency tuning, which is based on the regime of a resonance backward-wave oscillator with a combination of an irregular low-Q cavity and a narrow-band external reflector. The simulation performed for the gyrotron at the fundamental cyclotron resonance demonstrates the possibility of creating gyrotrons with high efficiency (10–30%) ensured in a wide frequency range (about 10%). For the gyrotron at the second cyclotron harmonic, the calculations predict that a gyrotron with frequency tuning in a band about 1% can be implemented with an efficiency of 5–10%. A possible solution of a problem of the narrow-band external frequency-tunable reflector is also discussed.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 66, Nos. 7–8, pp. 621–636, July–August 2023. Russian https://doi.org/10.52452/00213462_2023_66_07_621
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Bandurkin, I.V., Bylinsky, N.A., Zaslavsky, V.Y. et al. Frequency-Tunable Gyrotron with External Reflections. Radiophys Quantum El (2024). https://doi.org/10.1007/s11141-024-10316-9
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DOI: https://doi.org/10.1007/s11141-024-10316-9