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(FTP/23) Development of High Power Long Pulse Gyrotron for ITER

K. Sakamoto, A. Kasugai, M. Tsuneoka, K. Takahashi, Yu. Ikeda, T. Imai, T. Kariya¹, Y. Mitsunaka¹

RF Heating Lab., JAERI, Naka-machi, Ibaraki, 311-0193 Japan
¹ Electron Tube Division, Toshiba Co. Otawara-shi, Tochigi, 324-8550 Japan

Abstract.  A development of 170GHz gyrotron has been carried out as a task of ITER/EDA, and remarkable progress was obtained. Critical issues on the gyrotron development; low efficiency, high heat load at the resonator, window problem, have been solved by breakthroughs; a depressed collector, 1MW single mode oscillation with a high order mode TE_{31, 8}, and development of the diamond window gyrotron, respectively. The prototype ITER gyrotron which integrated these technologies were fabricated and tested. Up to now, the power output of 0.45MW, 8sec has been obtained with a diamond window gyrotron. These results give a clear prospect of the 1MW/CW 170GHz gyrotron.

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