Speaker
Dr
Tsuyoshi Kariya
(Plasma Research Center, University of Tsukuba)
Description
Megawatt (MW) gyrotrons with a wide frequency range from 14 to 300 GHz are being developed for the collaborative Electron Cyclotron Heating (ECH) study of advanced fusion devices and DEMO reactor. (1) In the first experiment of 300 GHz gyrotron, an output power of over 0.5 MW with TE32,18 single-mode was achieved with a pulse width of 2 ms. This is the first report of MW level oscillation with the DEMO-relevant ECH gyrotron mode. It was also found that the reflection at the output window affects the oscillation mode determination. (2) A new record of the 28 GHz gyrotron output of 1.38 MW was obtained. The fabrication of a newly designed tube aimed at a dual-frequency output power of 2 MW at 28 GHz (0.4 MW CW) and 1 MW at 35 GHz has begun, with all components ready for assembly. Before installing a double-disk window in the dual-frequency gyrotron, we confirmed the dependence of reflective power on the coolant thickness including the reflective power less than 2 % by the cold test using a Gunn diode power of 1 W and the hot test using the gyrotron output power of 600 kW. (3) Based on the successful results of 77 and 154 GHz LHD tubes, the new design of a 154/116 GHz dual-frequency gyrotron with output of over 1.5 MW has been presented.
| Country or International Organization | Japan |
|---|---|
| Paper Number | FIP/1-6Rc |
Primary author
Dr
Tsuyoshi Kariya
(Plasma Research Center, University of Tsukuba)
Co-authors
Dr
Hiroe Igami
(National Institute for Fusion Science)
Dr
Hiromi Takahashi
(National Institute for Fusion Science)
Prof.
Hiroshi Idei
(Research Institute for Applied Mechanics, Kyushu University)
Prof.
Kazuaki Hanada
(Advanced Fusion Research Center, Research Institute for Applied Mechanics, Kyushu University)
Prof.
Kazunobu Nagasaki
(Institute of Advanced Energy, Kyoto University)
Dr
Keishi Sakamoto
(Japan Atomic Energy Agency)
Mr
Kohei Tsumura
(Plasma Research Center, University of Tsukuba)
Dr
Kohta Okada
(National Institute for Fusion Science)
Dr
Koji Takahashi
(Japan Atomic Energy Agency)
Dr
Masayuki Ono
(PPPL/Princeton University)
Dr
Ryosuke Ikeda
(Japan Atomic Energy Agency)
Dr
Ryutaro MINAMI
(Plasma Research Center, University of Tsukuba)
Dr
Ryuya Ikezoe
(Plasma Research Center, University of Tsukuba)
Mr
Sakuji Kobayashi
(National Institute for Fusion Science)
Mr
Satoshi Ito
(National Institute for Fusion Science)
Prof.
Shin Kubo
(National Institute for Fusion Science)
Dr
Shinichi Moriyama
(Japan Atomic Energy Agency)
Prof.
Takashi Mutoh
(National Institute for Fusion Science)
Prof.
Takashi Shimozuma
(National Institute for Fusion Science)
Dr
Takayuki Kobayashi
(Japan Atomic Energy Agency)
Mr
Taku Eguchi
(Toshiba Electron Tubes and Devices Co., Ltd)
Dr
Tomoharu Numakura
(Plasma Research Center, University of Tsukuba)
Prof.
Tsuyoshi Imai
(Plasma Research Center, University of Tsukuba)
Dr
Yasuhisa Oda
(Japan Atomic Energy Agency)
Dr
Yasuo Yoshimura
(National Institute for Fusion Science)
Mr
Yoichi Endo
(Plasma Research Center, University of Tsukuba)
Mr
Yoshika Mitsunaka
(Toshiba Electron Tubes and Devices Co., Ltd)
Prof.
Yousuke Nakashima
(Plasma Research Center, University of Tsukuba)
Mr
Yuto Ebashi
(Plasma Research Center, University of Tsukuba)
