We study theoretically the possibility to widen the frequency tuning bandwidth of the generation of subterahertz gyrotrons by using strong signal reflections by periodic structures of the Bragg type installed in the output line. It was shown earlier that wideband tuning is possible in gyrotrons with short cavities, where the use of such cavities reduces the sensitivity of excitation of higher longitudinal modes to the spread of electron beam velocities. However, the issue of the formation of polyhelical electron beams with high currents arises in this case, and such beams are required to ensure the conditions of self-excitation in a short gyrotron cavity. The introduction of strong reflections allows one to significantly reduce the starting and operating currents, at which several higher longitudinal modes are excited. This ensures frequency tuning of about 8% at a power level of 0.5–1.0 kW with the use of electron beams which can be formed in magnetron-injection guns having the conventional geometry.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 63, Nos. 5–6, pp. 403–410, March 2020.
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Rozental’, R.M., Zotova, I.V., Glyavin, M.Y. et al. Widening of the Frequency Tuning Bandwidth in a Subterahertz Gyrotron with an External Bragg Reflector. Radiophys Quantum El 63, 363–370 (2020). https://doi.org/10.1007/s11141-021-10061-3
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DOI: https://doi.org/10.1007/s11141-021-10061-3