caa a22 4500 445305509 CHVBK 20180317142611.0 cr unu---uuuuu 170323e20110301xx s 000 0 eng 10.1007/s10762-010-9727-8 doi (NATIONALLICENCE)springer-10.1007/s10762-010-9727-8 Development of 28GHz and 77GHz, Mega-Watt Gyrotrons for Fusion Devices [Elektronische Daten] [Tsuyoshi Kariya, Ryutaro Minami, Tsuyoshi Imai, Mao Ota, Youichi Endo, Shin Kubo, Takahashi Shimozuma, Hiromi Takahashi, Yasuo Yoshimura, Satoshi Ito, Takahashi Mutoh, Keishi Sakamoto, Yoshika Mitsunaka] A 28GHz 1MW with TE8,3 cavity for GAMMA10 tandem mirror and a 77GHz 1.5MW gyrotron with TE18,6 for Large Helical Device (LHD) have been developed to upgrade their Electron Cyclotron Heating (ECH) systems. In the 28GHz gyrotron, the maximum power of 1.05MW was obtained, which is in agreement with its design target value. And the high efficiency of 40% without collector potential depression (CPD) was obtained with 0.8MW. In the first and second 77GHz gyrotrons, 0.8MW 3.6sec., 0.3MW 60sec operations have been achieved, but several issues due to the stray RF and velocity dispersion have been found, too. In consideration of these, the design improvement was performed to aim at 1.5MW in the third tube. In the short pulse test, the maximum output power of 1.6MW and the maximum total efficiency of 49.4% with CPD were obtained. In the long pulse test, the pulse length extended to 5sec with 1MW, 1800sec with 0.1MW, 1.6sec with 1.5MW. Total injection power of 3.1MW to LHD plasma has been achieved. It is shown that the electron beam pitch factor α decreases with increasing of beam current, comparing with the experimental and calculation results. Springer Science+Business Media, LLC, 2010 Gyrotron nationallicence MW nationallicence 28GHz nationallicence 77GHz nationallicence ECH nationallicence Tandem mirror nationallicence GAMMA10 nationallicence LHD nationallicence Kariya Tsuyoshi Plasma Research Center (PRC), University of Tsukuba, 305-8577, Tsukuba, Ibaraki, Japan aut Minami Ryutaro Plasma Research Center (PRC), University of Tsukuba, 305-8577, Tsukuba, Ibaraki, Japan aut Imai Tsuyoshi Plasma Research Center (PRC), University of Tsukuba, 305-8577, Tsukuba, Ibaraki, Japan aut Ota Mao Plasma Research Center (PRC), University of Tsukuba, 305-8577, Tsukuba, Ibaraki, Japan aut Endo Youichi Plasma Research Center (PRC), University of Tsukuba, 305-8577, Tsukuba, Ibaraki, Japan aut Kubo Shin National Institute for Fusion Science (NIFS), 509-5292, Toki, Gifu, Japan aut Shimozuma Takahashi National Institute for Fusion Science (NIFS), 509-5292, Toki, Gifu, Japan aut Takahashi Hiromi National Institute for Fusion Science (NIFS), 509-5292, Toki, Gifu, Japan aut Yoshimura Yasuo National Institute for Fusion Science (NIFS), 509-5292, Toki, Gifu, Japan aut Ito Satoshi National Institute for Fusion Science (NIFS), 509-5292, Toki, Gifu, Japan aut Mutoh Takahashi National Institute for Fusion Science (NIFS), 509-5292, Toki, Gifu, Japan aut Sakamoto Keishi Japan Atomic Energy Agency (JAEA), 311-0193, Naka, Ibaraki, Japan aut Mitsunaka Yoshika Toshiba Electron Tube & Devices Co.,Ltd. (TETD), 324-8550, Otawara, Tochigi, Japan aut Journal of Infrared, Millimeter, and Terahertz Waves Springer US; http://www.springer-ny.com 32/3(2011-03-01), 295-310 1866-6892 32:3<295 2011 32 10762 https://doi.org/10.1007/s10762-010-9727-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10762-010-9727-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kariya Tsuyoshi Plasma Research Center (PRC), University of Tsukuba, 305-8577, Tsukuba, Ibaraki, Japan aut NATIONALLICENCE 700 1- Minami Ryutaro Plasma Research Center (PRC), University of Tsukuba, 305-8577, Tsukuba, Ibaraki, Japan aut NATIONALLICENCE 700 1- Imai Tsuyoshi Plasma Research Center (PRC), University of Tsukuba, 305-8577, Tsukuba, Ibaraki, Japan aut NATIONALLICENCE 700 1- Ota Mao Plasma Research Center (PRC), University of Tsukuba, 305-8577, Tsukuba, Ibaraki, Japan aut NATIONALLICENCE 700 1- Endo Youichi Plasma Research Center (PRC), University of Tsukuba, 305-8577, Tsukuba, Ibaraki, Japan aut NATIONALLICENCE 700 1- Kubo Shin National Institute for Fusion Science (NIFS), 509-5292, Toki, Gifu, Japan aut NATIONALLICENCE 700 1- Shimozuma Takahashi National Institute for Fusion Science (NIFS), 509-5292, Toki, Gifu, Japan aut NATIONALLICENCE 700 1- Takahashi Hiromi National Institute for Fusion Science (NIFS), 509-5292, Toki, Gifu, Japan aut NATIONALLICENCE 700 1- Yoshimura Yasuo National Institute for Fusion Science (NIFS), 509-5292, Toki, Gifu, Japan aut NATIONALLICENCE 700 1- Ito Satoshi National Institute for Fusion Science (NIFS), 509-5292, Toki, Gifu, Japan aut NATIONALLICENCE 700 1- Mutoh Takahashi National Institute for Fusion Science (NIFS), 509-5292, Toki, Gifu, Japan aut NATIONALLICENCE 700 1- Sakamoto Keishi Japan Atomic Energy Agency (JAEA), 311-0193, Naka, Ibaraki, Japan aut NATIONALLICENCE 700 1- Mitsunaka Yoshika Toshiba Electron Tube & Devices Co.,Ltd. (TETD), 324-8550, Otawara, Tochigi, Japan aut NATIONALLICENCE 773 0- Journal of Infrared, Millimeter, and Terahertz Waves Springer US; http://www.springer-ny.com 32/3(2011-03-01), 295-310 1866-6892 32:3<295 2011 32 10762 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer