Development of gyrotrons at Thomson-CSF†

Abstract
In this paper, experimental results on a 35 GHz 250 kw gyrotron oscillator (TH 1501 A) are first summarized. The project of a 70 GHz oscillator operating on the second harmonic of the cyclotron resonance is then discussed, and first experimental results are described. Theoretical work on space charge effects in a single orbit cylindrical beam oscillator is also reported. Numerical results indicate typically a 15% decrease in logarithmic gain.

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