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 in a collaborative ECH study for advanced fusion devices and a DEMO. (1) Detailed designs of a 14 GHz 1 MW gyrotron has been started for actual fabrication. For a 14 GHz RF beam with high divergence, a calculated transmission efficiency of 85% to the corrugated waveguide coupling position was initially obtained by minimizing the RF transmission path. (2) In the experimental tests of a new 28/35 GHz dual-frequency gyrotron, the cooling characteristics of an optimal-structure double-disk sapphire window was evaluated. We confirmed that operating at 0.4 MW with a continuous wave (CW) at 28 GHz is possible, which is two times the output power reported in previous studies. (3) A 77/51 GHz dual-frequency gyrotron with an output of over 1 MW is presented. (4) In an experiment with a 300 GHz gyrotron, the influence of the reflected wave from the window was reduced by tilting the output window, and mode competition in the cavity was suppressed. An output power of 0.62 MW with a pulse width of 1 ms, which is the new record in this frequency, was obtained.
| Country or International Organization | Japan |
|---|---|
| Paper Number | FIP/P1-56 |
Primary author
Dr
Tsuyoshi Kariya
(Plasma Research Center, University of Tsukuba)
Co-authors
Ms
Hiroe Igami
(National Institute for Fusion Science)
Dr
Hiromi Takahashi
(National Institute for Fusion Science)
Dr
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
(National Institutes for Quantum and Radiological Science and Technology)
Dr
Ken Kajiwara
(National Institutes for Quantum and Radiological Science and Technology)
Dr
Koji Takahashi
(National Institutes for Quantum and Radiological Science and Technology)
Ms
Maki Okada
(Plasma Research Center, University of Tsukuba)
Dr
Masayuki Ono
(PPPL/Princeton University)
Dr
Ryosuke Ikeda
(National Institutes for Quantum and Radiological Science and Technology)
Dr
Ryutaro MINAMI
(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
(National Institutes for Quantum and Radiological Science and Technology)
Prof.
Takashi Shimozuma
(National Institute for Fusion Science)
Dr
Takayuki Kobayashi
(National Institutes for Quantum and Radiological Science and Technology)
Mr
Taku Eguchi
(Toshiba Electron Tubes and Devices Co., Ltd)
Dr
Takumi Onchi
(Research Institute for Applied Mechanics, Kyushu University)
Dr
Tomoharu Numakura
(Plasma Research Center, University of Tsukuba)
Dr
Toru Tsujimura
(National Institute for Fusion Science)
Prof.
Tsuyoshi Imai
(Plasma Research Center, University of Tsukuba)
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)
Mr
Yoshio Kawakami
(Toshiba Electron Tubes and Devices Co., Ltd)
Prof.
Yousuke Nakashima
(Plasma Research Center, University of Tsukuba)
