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Aiba, Nobuyuki; Tokuda, Shinji; Fujita, Takaaki; Ozeki, Takahisa; Chu, M. S.*; Snyder, P. B.*; Wilson, H. R.*
Plasma and Fusion Research (Internet), 2, p.010_1 - 010_8, 2007/04
Numerical method for the stability analysis of ideal MHD modes is invented by using the physical model based on the two-dimensional Newcomb equation in combination with the conventional ideal MHD model. The MARG2D code built on this numerical method realizes to analyze the stability of wide 
range of ideal MHD modes. The validity of MARG2D has been confirmed with the benchmarking test with the DCON code by identifying the stability boundary of low- modes, and that with the ELITE code by comparing the growth rates of intermediate to high modes. With the MARG2D code, the edge stability of JT-60SA, the complementally experiment of ITER, is investigated.
Kamiya, Kensaku; Urano, Hajime; Oyama, Naoyuki; Kamada, Yutaka
Plasma and Fusion Research (Internet), 2, p.005_1 - 005_10, 2007/03
Effects of plasma rotation and losses of fast ion on the Type-I ELM characteristics have been systematically studied in the JT-60U tokamak, scanning combinations of NBI (tangential co-, balanced-, and counter-NBI plus perpendicular NBI) at the three types of plasma configurations (corresponding toroidal field ripple at the plasma edge, 0.4, 1, and 2%). New findings on the Type-I ELM characteristics are as follows. Smaller ELM energy loss normalized by pedestal stored energy, and more frequent ELM frequency, are confirmed in the counter-NBI in comparison to the co-NBI discharges. Nevertheless, the power loss due to ELM normalized by heating power crossing the separatrix is constant regardless of the direction of the momentum injection at each plasma configurations.
Chida, Teruo; Ida, Mizuho; Nakamura, Hiroo; Sugimoto, Masayoshi; Simakov, S. P.*
no journal, ,
no abstracts in English
Ida, Mizuho; Nakamura, Hiroo; Sugimoto, Masayoshi
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Kobayashi, Noriyuki; Takahashi, Koji; Kasugai, Atsushi; Sakamoto, Keishi
no journal, ,
An EC antenna of ITER uses a movable metal mirror horizontally rotatable to steer the RF beams. A rotor of the mirror is supported by bearings at its top and bottom. The mirror is rotated by moving a ceramic coated pin perpendicular to the rotar axis in a groove of a cum on the rotor. The pin is connected at the head of a drive shaft supported by linear bearings. Driving force is generated by conversion of rotation of a ultrasonic motor into linear motion by a LM actuator composed of a linear guide and a ball screw. A drive test was performed in vacuum at about 100
C to confir the reliability of the drive mechanism. In order to construct a high radiation resitant driver unit, neutron irradiation test of elements of the ultrasonic motor and a capacitive encoder, which eliminates photodiodes, are going on. The result of the drive test in vacuum at high temperature and the R&D of the capacitive encoder are presented.
Takahashi, Koji; Kobayashi, Noriyuki; Kasugai, Atsushi; Ikeda, Yukiharu; Sakamoto, Keishi
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Takei, Nahoko; Ushigome, Masahiro*; Suzuki, Takahiro; Takechi, Manabu; Aiba, Nobuyuki; Nakamura, Yukiharu; Takase, Yuichi*
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Ochi, Yoshihiro; Kawachi, Tetsuya; Hasegawa, Noboru; Kishimoto, Maki; Nagashima, Keisuke; Tanaka, Momoko; Nishikino, Masaharu; Kunieda, Yuichi; Sukegawa, Kota; Yamatani, Hiroshi
no journal, ,
no abstracts in English
Sugihara, Masayoshi; Polevoi, A.*; Fujieda, Hirobumi*; Shimada, Michiya; Yoshino, Ryuji
no journal, ,
Pellet injection is one of the strong candidates for Type I ELM amplitude control. In ITER, this scheme has been selected as a first candidate method to suppress the amplitude. In order to provide the physics specification for this scheme in ITER, following issues are investigated; (1) required penetration depth of the pellet to trigger the ELM, (2) compatibility with particle transport and density control, (3) dependence of injection direction (high field or low field side). Operation spaces for each injection direction are evaluated based on these investigations and the necessary physics specifications are derived.
Nakamura, Yukiharu; Tobita, Kenji; Fukuyama, Atsushi*; Takei, Nahoko; Takase, Yuichi*; Ozeki, Takahisa; Jardin, S. C.*
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Matsukawa, Makoto; Kurita, Genichi; Tamai, Hiroshi; Sakurai, Shinji; Masaki, Kei; Shibama, Yusuke; Kizu, Kaname; Tsuchiya, Katsuhiko
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Hirohata, Yuko*; Tanabe, Tetsuo*; Oya, Yasuhisa*; Arai, Takashi; Masaki, Kei; Okuno, Kenji*; Sugiyama, Kazuyoshi*; Oyaizu, Makoto*; Yoshikawa, Akira*; Yoshida, Masashi*
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Nakano, Tomohide; Asakura, Nobuyuki; Ono, Noriyasu*; Kajita, Shin*; Kawashima, Hisato; Kubo, Hirotaka; Shimizu, Katsuhiro; Fujimoto, Kayoko
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Suzuki, Yutaka; Kawashima, Hisato; Coster, D. P.*; Sakurai, Shinji; Matsukawa, Makoto; Tamai, Hiroshi
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Koide, Yoshihiko; Kubo, Hirotaka; Sakurai, Shinji; Sukegawa, Atsuhiko; Matsukawa, Makoto; Kamada, Yutaka; JT-60SA Design Team
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Watanabe, Kazuhiro; Hanada, Masaya; Omine, Takeshi; Sakamoto, Keishi; Inoue, Takashi; Matsuyama, Hisayoshi*; Nagayama, Toshitake*
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no abstracts in English
Moriyama, Shinichi; Fujii, Tsuneyuki; Seki, Masami; Sawahata, Masayuki; Suzuki, Sadaaki; Yokokura, Kenji; Shimono, Mitsugu; Terakado, Masayuki; Shinozaki, Shinichi; Hasegawa, Koichi; et al.
no journal, ,
The JT-60SA will be an upgrade of JT-60U in a combined project of satellite tokamak in ITER broader approach and Japanese national project. The target is to sustain non-inductive current driven plasma at high b (bN=3.5-5.5) for at least 100 s. The JT-60U ECH system will be upgraded as well as the tokamak. The gyrotron power will be 9MW for 100 s. The Europe (EU) side will supply three 140GHz gyrotron systems including high voltage power supplies. Japan (JA) side will fabricate two 140GHz gyrotrons but their high voltage power supplies will be supplied by EU. The rest of the system including transmission line, antenna, 110GHz gyrotrons and their power supplies will be upgraded or fabricated by JA. The system will have four antennas having two-dimensional beam scan capability. The antennas featuring steering mirror driven in the linear motion that are suitable in a fusion-reactor-environment is under development for this purpose.
Tanabe, Tetsuo*; Sugiyama, Kazuyoshi*; Masaki, Kei
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Kondoh, Takashi; Hayashi, Toshimitsu; Kawano, Yasunori; Kusama, Yoshinori; Sugie, Tatsuo
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Oikawa, Toshihiro; Shimada, Michiya; Polevoi, A. R.*; Naito, Osamu; Hayashi, Nobuhiko; Ozeki, Takahisa
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no abstracts in English
