We describe the main stages of the development of a gyrotron in the sub-terahertz band with a power of several hundreds of kilowatts, a duration of the output radiation pulses of about 10 μs, and the generation frequency corresponding to an atmospheric transparency window. The gyrotron having a working frequency of 0.67 THz, a power of 200–300 kW, and the focal diameter of the output beam 1–2 mm can be used to detect sources of ionizing radiation from a distance of several tens of meters. The detection principle is based on the appearance of a microwave frequency discharge in the focal spot if the number of free electrons exceeds the natural background by 1–2 orders of magnitude. The electron-optical system of such a gyrotron has been calculated and optimized. The scenario of the gyrotron switch-on has been analyzed for the electron beam formed in such a system, and the possibility of stable single-mode generation on the TE31.8 mode is demonstrated. The results of analysis of thermal loads, which demonstrate their acceptable level in the cavity and the tube cavity for pulse durations of about 10 μs are presented.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 54, No. 8–9, pp. 666–675, August–September 2011.
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Glyavin, M.Y., Luchinin, A.G., Manuilov, V.N. et al. Development of a high-power pulsed subterahertz gyrotron for remote detection of sources of ionizing radiation. Radiophys Quantum El 54, 600–608 (2012). https://doi.org/10.1007/s11141-012-9319-7
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DOI: https://doi.org/10.1007/s11141-012-9319-7