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Kobayashi, Takayuki; Terakado, Masayuki; Sato, Fumiaki; Yokokura, Kenji; Shimono, Mitsugu; Hasegawa, Koichi; Sawahata, Masayuki; Suzuki, Sadaaki; Hiranai, Shinichi; Igarashi, Koichi; et al.
Plasma and Fusion Research (Internet), 4, p.037_1 - 037_10, 2009/08
Electron cyclotron (EC) heating and current drive (CD) are key tools to control fusion plasma especially for effective electron heating and for suppression of neoclassical tearing mode (NTM). Recently, developments of a high power gyrotron and a power modulation technique have been successfully achieved on JT-60U ECRF system in order to enhance the system performance. Stable gyrotron oscillation with oscillation power of 1.5 MW for 1 s was demonstrated in 2007, for the first time. Then temperature rise of cavity and collector has been investigated. It has been shown that the longer pulse operation with 1.5 MW by an improved 110 GHz gyrotron is possible. In addition, modulated ECCD in synchronized with NTM rotation has been performed with the oscillation power of 0.8 MW and the frequency around 5 kHz. The synchronizing system has worked very well and it has played an essential role in NTM suppression experiments on JT-60U.
Koide, Yoshihiko
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The result of JT-60 as the National Centralized Tokamak and the development in the future will be reported in Symposium on "Development of the domestic tokamak research after the JT-60 experiment is completed". Reported first will be the details of how the JT-60 was placed as the National Centralized Tokamak. Next will be the remarkable results of joint research, which resulted from the further emphasis on the system of management of the corporate planning and a joint research. Finally, considering that a joint research related to JT-60SA becomes a main subject after 2009, we will show the policy of continuing a joint research by changing its name to "National Centralized Tokamak Joint Research".
Tobari, Hiroyuki; Umeda, Naotaka; Watanabe, Kazuhiro; Inoue, Takashi; Sakamoto, Keishi; Yamashita, Yasuo*
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no abstracts in English
Kajiwara, Ken; Kasugai, Atsushi; Oda, Yasuhisa; Takahashi, Koji; Kobayashi, Noriyuki; Sakamoto, Keishi
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no abstracts in English
Nishiyama, Tomokazu; Okano, Fuminori; Miyo, Yasuhiko; Sasaki, Noboru*; Meguro, Masashi*; Tajika, Masaharu*; Sato, Yoji; Sato, Masayasu
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no abstracts in English
Hayashi, Takumi
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no abstracts in English
Akasaka, Hiromi; Kawamata, Yoichi; Sato, Minoru; Naito, Osamu; Kurihara, Kenichi
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Isayama, Akihiko; JT-60 Team
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Isayama, Akihiko; Matsunaga, Go; Kobayashi, Takayuki; Moriyama, Shinichi; Oyama, Naoyuki; Sakamoto, Yoshiteru; Suzuki, Takahiro; Urano, Hajime; Hayashi, Nobuhiko; Kamada, Yutaka; et al.
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no abstracts in English
Murakami, Masakazu
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JAEA works to show the public easy-to-understand basic information on future energy supply and demand hoping to encourage vigorous discussion. In this study, a variety of technological options are quantitatively examined on their effectiveness in reducing emissions and stabilizing energy supplies and shown as a simple supply and demand scenario toward the year 2100.
plasmasMatsunaga, Go; Shinohara, Koji; Aiba, Nobuyuki; Sakamoto, Yoshiteru; Takechi, Manabu; Suzuki, Takahiro; Isayama, Akihiko; Hirota, Makoto; Oyama, Naoyuki; Asakura, Nobuyuki; et al.
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no abstracts in English
Kawashima, Hisato; Shimizu, Katsuhiro; Takizuka, Tomonori; Tobita, Kenji; Nishio, Satoshi; Sakurai, Shinji; Takenaga, Hidenobu
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no abstracts in English
Takechi, Manabu; Fujieda, Hirobumi; Sakurai, Shinji; Matsukawa, Makoto; Masaki, Kei; Shibama, Yusuke; Higashijima, Satoru; Shibanuma, Kiyoshi; Sakasai, Akira
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no abstracts in English
Kojima, Atsushi; Kamiya, Kensaku; Oyama, Naoyuki; Fujita, Takaaki; Kubo, Hirotaka; Iguchi, Harukazu*; Suzuki, Takahiro; Kamada, Yutaka
no journal, ,
In order to understand the ELM physics, a lithium beam probe system is developed using an electron beam heating ion source. The beam optics are optimized so as to decrease the beam divergence angle using the numerical simulation taking the space charge effects into account. A beam extraction with a beam current of 10 mA during 50 seconds is successfully demonstrated by the lithium beam injector. Then the edge density profile is measured with high time resolution of 0.5 msec and high spatial resolution of 1 cm. Then the density collapse due to ELM crash is successfully observed for the first time in type I and grassy ELMs.
Shiraishi, Junya; Tokuda, Shinji; Aiba, Nobuyuki; Chu, M. S.*
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Takizuka, Tomonori; Shimizu, Katsuhiro; Hayashi, Nobuhiko; Hosokawa, Masanari*; Yagi, Masatoshi*
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no abstracts in English
Kurita, Genichi; Aiba, Nobuyuki; Tobita, Kenji; Nishio, Satoshi; Nagashima, Keisuke
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We obtain the critical beta for the up-down symmetric double-null equilibria against the position of conformal conducting wall in two cases; one is fixed plasma current profile case and another is varied plasma current profile case taking a bootstrap current into account. To obtain normalized beta value, bN=4.3, assumed in Slim-CS tokamak, we must put the conducting wall at r=1.2a and r=1.34a, where a is the plasma minor radius, for former and latter cases, respectively. The advantage of latter case comes from the higher minimum safety factor value due to larger plasma bootstrap current derived by the increased plasma pressure. If we consider the effect of edge pedestal plasma pressure, the critical beta can be increased. In this study, only the n=1 mode, which is considered to be most dangerous one, is investigated.
Ozeki, Takahisa; Hamamatsu, Kiyotaka; Shinohara, Koji; Fukuyama, Atsushi*; Takizuka, Tomonori; Hayashi, Nobuhiko; Honda, Mitsuru
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no abstracts in English
Hirota, Makoto; Tokuda, Shinji
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Resonant damping (e.g. continuum damping, Landau damping) of MHD wave is a key issue in various stability problems. In fact, accurate estimation of the damping (or growth) rate is needed for the resistive wall mode and the toroidicity-induced Alfv
n eigenmode. Recently, we have formulated wave action not only for eigenmodes but also for continuum mode, and found that the wave action is conserved among these modes in the process of resonant coupling. This fact can provide another approach to the estimation of resonant damping.
Sakamoto, Yoshiteru; Ida, Katsumi*; Yoshida, Maiko; Suzuki, Takahiro; Isayama, Akihiko; Oyama, Naoyuki; Matsunaga, Go; Takenaga, Hidenobu; Ide, Shunsuke; Koide, Yoshihiko; et al.
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no abstracts in English
