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For a number of practical applications, such as plasma diagnostics or high-resolution spectroscopy, and in prospect for development of the coherently radiating gyrotron complex for large CTS setups, it is important to have a source of radiation with a highly stable frequency. Locking of gyrotron oscillation frequency by an external monochromatic wave seems to be a promising way for obtaining such source. Although in the recent decades influence of the external monochromatic signal on the gyrotron operation was studied in a number of publications [1–6], specific designs of megawatt power level gyrotrons have not been discussed. Study of frequency stabilization by a wave coming into the cavity from the external tract became of particular interest since the development of the quasi-optical converter which allows to transform a large part of wave coming from the output section into the gyrotron operating mode at the Institute of Applied Physics RAS (IAP RAS) [7]. The aim of this paper is to determine the optimal parameters of the gyrotron and of the external signal for efficient single-mode generation in the multimode gyrotron at a stable frequency. Accordingly, we consider a number of problems of multimode gyrotron frequency locking by an external signal.

Influence of mode competition and external wave frequency modulation on gyrotron frequency locking