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Development of 170 GHz/500 kW gyrotron |
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| Authors: | Keishi Sakamoto Atsushi Kasugai Masaki Tsuneoka Koji Takahashi Yukiharu Ikeda Tsuyoshi Imai Takashi Nagashima Mitsuru Ohta Tsuyoshi Kariya Kenichi Hayashi Yoshika Mitsunaka Yosuke Hirata Yasuyuki Itoh Yukio Okazaki |
| Affiliation: | 1. Naka Fusion Research Establishment, Japan Atomic Energy Research Institute (JAERI), Naka-machi, 319-11, Ibaraki, Japan 2. R and D Center Toshiba Corporation, Ukishima-cho, Kawasaki-shi, 210, Kanagawa, Japan 3. Electron Tube and Devices Division, Toshiba Corporation, Otawara-shi, 324, Tochigi, Japan |
| Abstract: | A development of 170GHz/500kW level gyrotron was carried out as R&D work of ITER. The oscillation mode is TE31,8. In a short pulse experiment, the maximum power of 750kW was achieved at 85kV/40A. The efficiency was 22%. In the depressed collector operation, 500kW/36%/50ms was obtained. The maximum efficiency of 40% was obtained at PRF=470kW whereas the power decrease by the electron trapping was observed. Pulse extension was done up to 10s at PRF=170kW with the depressed collector operation. The power was limited by the temperature increase of the output window. |
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