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Results of the continued work on 1.5–1.7 MW CW gyrotron development are presented. Last year 1.5-MW power was attained at 92 kV beam voltage and 52 A beam current. This year the gyrotron with modernized electron-optical system was tested yielding up to 1.5-MW power at 72–77 kV beam voltage and 64–70 A beam current.
During last years several new gyrotrons were developed at IAP/GYCOM. The main ITER requirements to a gyrotron have been demonstrated: 170 GHz frequency, 1MW power, 1000 seconds pulse duration, 53% efficiency. For a multi-frequency gyrotron a novel scheme for a tunable window was developed. Additionally some other new gyrotrons were developed for running plasma installations. New directions in the...
The industrial production prototype of the ITER gyrotron was tested at the new test stand in Kurchatov institute with power 1.02 MW in 240 second pulses, and 0.8MW in 800 second pulses. Simultaneously at IAP a short pulse gyrotron with an increased size cavity was tested at power 1.5-2 MW.
The acute problem of in-waveguide transformation of an operating mode of the coaxial cavity gyrotron TE34,19 into paraxial Gaussian beam is solved. A short highly effective launcher which provided such a transformation is synthesized, fabricated and tested. Results of the experiment confirm the approach adequacy. The measured TEM0,0 mode content in the output launcher wavebeam exceeds 95%.
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