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

Yu.V Novozhilova,S.A Zapevalov,A.P Fokin,V.L Bakunin,A.V Chirkov,N.I Zaitsev,G.G Denisov,A.S Shevchenko,Yu.M Guznov,A.G Litvak

doi:10.1051/epjconf/201714904021

Abstract

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

Highlights

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
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]
We show that the width of the locking zones and maximum achievable current in the multimode gyrotron demonstrate non-monotonous dependence on the the external signal power, which can be explained by nonlinear mode competition (Fig. 1b)

Summary

Introduction

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. In the recent decades influence of the external monochromatic signal on the gyrotron operation was studied in a number of publications [1,2,3,4,5,6], specific designs of megawatt power level gyrotrons have not been discussed.

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Results

Conclusion