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Experimental Study of the Influence of the Electron Beam Quality on the Efficiency and Self-Excitation of a Gyroklystron

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Radiophysics and Quantum Electronics Aims and scope

We study experimentally the electron distribution functions in longitudinal velocities in actual (non-modeled) operating regimes of a two-cavity gyroklystron. It is shown that as the beam’s magnetic compression factor α increases, the distribution function is transformed smoothly from the quasi-Gaussian to a multi-peak one. The main region of this evolution is longitudinal bunching of the beam, which is affected by low-frequency oscillations of the space charge accumulated in the trap between the cathode and the magnetic mirror, with the growing α. At the stage of well-developed instability, the electron beam is a sequence of electron bunches with greatly different longitudinal velocities. It is demonstrated experimentally that the maximum gyroklystron efficiency is achieved at a certain α = αopt, when the electron distribution function in longitudinal velocities is not quasi-Gaussian already, but has only one extremum yet. At a greater magnetic compression factor (α > αopt), the gyroklystron efficiency decreases sharply, which is connected with the modulation of the electron beam density. In the regimes with a multi-peak distribution function, the bunches, which are isolated in the electron beam, excite high-frequency oscillations in the output cavity independently of each other as individual generation zones with respect to the magnetic field that have identical frequencies coinciding with the cavity frequency. The results of calculating the positions of the generation zones with respect to the magnetic field coincide with the experimental data with sufficient accuracy.

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Authors and Affiliations

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

    E. V. Zasypkin & I. G. Gachev

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  1. E. V. Zasypkin
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  2. I. G. Gachev
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Correspondence to E. V. Zasypkin.

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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 63, Nos. 7, pp. 568–579, July 2020.

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Zasypkin, E.V., Gachev, I.G. Experimental Study of the Influence of the Electron Beam Quality on the Efficiency and Self-Excitation of a Gyroklystron. Radiophys Quantum El 63, 511–521 (2020). https://doi.org/10.1007/s11141-021-10075-x

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  • DOI: https://doi.org/10.1007/s11141-021-10075-x

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