Conclusions
In a gyrotron (amplifier or oscillator) having an electrodynamic system in the form of a slightly irregular waveguide having a low effective Q, the frequency of the variable field is close to the critical frequency of one of the natural waves of the waveguide in operating modes having a high efficiency; as consequence of this:
-
1)
a fairly accurate determination of the optimal parameters of the system may be accomplished by extrapolation of the results of the theory based on the fixed-variable-field-structure approximation;
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2)
a constraint on the output power exists which is caused on the one hand by mode competition and on the other hand by rebunching of electrons in an excessively powerful variable field, which according to the constraint imposed by the diffraction Q(1), may develop in the electrodynamic system of a gyrotron when a powerful electron beam is injected into it.
Although the indicated constraints are of a universal character, it is obvious that by choosing the profile of the electrodynamic system and the distribution of the static magnetic field one may achieve a noticeable increase in efficiency, power, and likewise a widening of the electronic frequency tuning range or the amplification passband of the gyrotrons in comparison with the simplest versions of this type of device.
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Additional information
Scientific-Research Radio-Physics Institute. Translated from Izvestiya Vysshikh Uchebnykh Zavedenil, Radiofizika, Vol. 16, No. 4, pp. 622–630, April, 1973.
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Bratman, V.L., Moiseev, M.A., Petelin, M.I. et al. Theory of gyrotrons with a nonfixed structure of the high-frequency field. Radiophys Quantum Electron 16, 474–480 (1973). https://doi.org/10.1007/BF01030898
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DOI: https://doi.org/10.1007/BF01030898