Calculations of Starting Currents and Frequencies in Frequency-Tunable Gyrotrons

Dumbrajs, O.; Idehara, T.; Saito, T.; Tatematsu, Y.

doi:10.7567/jjap.51.126601

Cited by 14 publications

(1 citation statement)

References 22 publications

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“…Most of the models that have been used in the past to calculate the self-excitation condition, expressed in terms of a starting current, are not self-consistent 2,5,[7][8][9] , in the sense that the emptycavity longitudinal eigenmode is used. However, the necessity of using a self-consistent model has been discussed in several publications 6,[10][11][12][13] , especially for backwardwave interactions where self-consistent effects are important. The majority of these models are time-dependent, describing the time evolution of the most unstable mode.…”

Section: Introductionmentioning

confidence: 99%

Novel linear analysis for a gyrotron oscillator based on a spectral approach

et al. 2016

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With the aim of getting a better physical insight in linear regimes in gyrotron, a new linear model was developed. This model is based on a spectral approach for solving the self-consistent system of equations describing the wave-particle interaction in the cavity of a gyrotron oscillator. Taking into account the walllosses self-consistently and including the main system inhomogeneities in the cavity geometry and in the magnetic field, the model is appropriate to consider real system parameters. The main advantage of the spectral approach, compared to a time-dependent approach, is the possibility to describe all the stable and unstable modes, respectively with negative and positive growth rate. This permits to reveal the existence of a new set of eigenmodes, in addition to the usual eigenmodes issued from cold-cavity modes. The proposed model can be used for studying other instabilities such as for instance backward waves potentially excited in gyrotron beam tunnels.

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