We present the main stages of developing a subgigawatt Ka-band gyrotron with the operating TM5, 1 mode. In order to discriminate the TE modes, we propose using a longitudinally slitted cavity, for which an analytical theory has been developed, calculations by the finite-element method have been made, and “cold” electrodynamic measurements (in the absence of an electron beam) have been performed. The first experimental studies of the gyrotron based on the classical scheme with separation of the beam formation space and the electron–wave interaction region have been carried out. The problem of the rise of parasitic oscillations at the TE mode, which are related to self-excitation of the beam formation region, has been revealed experimentally and within the framework of the three-dimensional simulation by the particle-in-cell method. A modification of the system, where the beam formation region shifts to the gyrotron cavity, is proposed as a way to solve this problem. Modeling has demonstrated the possibility to generate radiation with a power of about 150 MW in such a system. Preliminary calculations of a W-band gyrotron operated at the TM15, 1 mode with a similar output radiation power level have been made.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 65, Nos. 5–6, pp. 448–464, May–June 2022. Russian DOI: https://doi.org/10.52452/00213462_2022_65_05_448
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Danilov, Y.Y., Denisenko, A.N., Leontyev, A.N. et al. Development of High-Current Relativistic Gyrotrons with the Operating TM Mode. Radiophys Quantum El 65, 410–424 (2022). https://doi.org/10.1007/s11141-023-10223-5
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DOI: https://doi.org/10.1007/s11141-023-10223-5