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Multicavity W-Band Continuous-Wave Gyroklystron

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Radiophysics and Quantum Electronics Aims and scope

Multicavity continuous-wave gyroklystrons generating moderate powers in the short-wave part of the millimeter-wave band can be used as highly stable frequency-tunable microwave sources in such applications as radar ranging, wireless telecommunication systems for digital communications, plasma diagnostics, microwave material processing, generation of multi-charge ion beams, and high-resolution spectroscopy on the basis of nuclear magnetic resonance (NMR) and dynamic polarization of atomic nuclei. In this paper, the proposed method is used to calculate optimal parameters of a four-cavity CW gyroklystron operating in the three-millimeter wavelength band in the maximum amplification regime. The design of a gyroklystron with the operating TE011 mode is described, and the results of studying it experimentally are presented. They demonstrate that an output power of 2.5 kW is achieved at a frequency of 92 GHz with an efficiency of 25% at an accelerating beam voltage of 22 kV and a current of 0.46 A. The fact that the power and efficiency are limited by the achieved values is determined by an uncontrollable avalanche-type increase in the emission current, which is caused by the cathode heating due to its bombardment with electrons reflected from the magnetic mirror. The gain and bandwidth of the amplified frequencies, which were measured at a power level of 2 kW at a beam current of 0.3 A, were equal to 28 dB and 320 MHz (0.36%), respectively. The experimental results agree well quantitatively with the results of the calculations.

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Authors and Affiliations

  1. Institute of Applied Physics of the Russian Academy of Sciences, Nizhny Novgorod, Russia

    E. V. Zasypkin

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Correspondence to E. V. Zasypkin.

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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 65, Nos. 5–6, pp. 434–447, May–June 2022. Russian DOI: https://doi.org/10.52452/00213462_2022_65_05_434

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Zasypkin, E.V. Multicavity W-Band Continuous-Wave Gyroklystron. Radiophys Quantum El 65, 397–409 (2022). https://doi.org/10.1007/s11141-023-10222-6

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