14 December 1992 High power operation of a 200-3-GHz gyrotron oscillator
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Proceedings Volume 1929, 17th International Conference on Infrared and Millimeter Waves; 19292O (1992) https://doi.org/10.1117/12.2298213
Event: 17th International Conference on Infrared and Millimeter Waves, 1992, Pasadena, CA, United States
Abstract
A detailed experimental study is presented of a pulsed megawatt gyrotron oscillator operating in the 200-300 GHz range. This design is consistent with continuous operation for ECRH of fusion plasmas. A cylindrical waveguide cavity with a diameter greater than 20 wavelengths was designed to limit ohmic wall losses to less than 2 kW/cm2. Two electron guns with beams of different radii were investigated. The first produces a large electron beam that couples to whispering gallery modes, and the second produces a smaller beam that couples to volume modes. The highest power achieved with the large gun was 1.2 MW at 231 GHz in the TE385 j mode. The efficiency in this case was 20%. Similar efficiencies were achieved with the small gun. Measured powers and efficiencies were generally about a factor of two below predictions based on single mode, self-consistent theory.
© (1992) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
T. L. Grimm, "High power operation of a 200-3-GHz gyrotron oscillator", Proc. SPIE 1929, 17th International Conference on Infrared and Millimeter Waves, 19292O (14 December 1992); doi: 10.1117/12.2298213; https://doi.org/10.1117/12.2298213
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