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Journal Articles

Numerical method for the stability analysis of ideal MHD modes with a wide range of toroidal mode numbers in tokamaks

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 $$n$$ 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-$$n$$ modes, and that with the ELITE code by comparing the growth rates of intermediate to high $$n$$ modes. With the MARG2D code, the edge stability of JT-60SA, the complementally experiment of ITER, is investigated.

Journal Articles

Roles of toroidal rotation at the plasma edge, toroidal field ripple and configuration on ELMs in the JT-60U tokamak

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.

Oral presentation

Present status of X-ray laser development at JAEA

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

Oral presentation

Type I ELM control by pellet injection in ITER

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.

Oral presentation

External control of internal transport barriers using inductive current perturbation in noninductive tokamak plasmas

Nakamura, Yukiharu; Tobita, Kenji; Fukuyama, Atsushi*; Takei, Nahoko; Takase, Yuichi*; Ozeki, Takahisa; Jardin, S. C.*

no journal, , 

no abstracts in English

Oral presentation

Divertor simulation on JT-60SA, 2

Suzuki, Yutaka; Kawashima, Hisato; Coster, D. P.*; Sakurai, Shinji; Matsukawa, Makoto; Tamai, Hiroshi

no journal, , 

no abstracts in English

Oral presentation

Optimization of diagnostics allocation on JT-60 super advanced

Koide, Yoshihiko; Kubo, Hirotaka; Sakurai, Shinji; Sukegawa, Atsuhiko; Matsukawa, Makoto; Kamada, Yutaka; JT-60SA Design Team

no journal, , 

no abstracts in English

Oral presentation

Development of a full size alumina ceramic insulator for the ITER NBI

Watanabe, Kazuhiro; Hanada, Masaya; Omine, Takeshi; Sakamoto, Keishi; Inoue, Takashi; Matsuyama, Hisayoshi*; Nagayama, Toshitake*

no journal, , 

no abstracts in English

Oral presentation

Design study of ECH system in JT-60SA

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.

Oral presentation

Hydrogen retention on tile gap in JT-60U

Tanabe, Tetsuo*; Sugiyama, Kazuyoshi*; Masaki, Kei

no journal, , 

no abstracts in English

Oral presentation

Development of Carbon dioxide laser for collective Thomson scattering diagnostics

Kondoh, Takashi; Hayashi, Toshimitsu; Kawano, Yasunori; Kusama, Yoshinori; Sugie, Tatsuo

no journal, , 

no abstracts in English

Oral presentation

Progress of electron cyclotron heating technology on JT-60U

Moriyama, Shinichi; Fujii, Tsuneyuki; Seki, Masami; Sawahata, Masayuki; Suzuki, Sadaaki; Shinozaki, Shinichi; Terakado, Masayuki; Hiranai, Shinichi; Hasegawa, Koichi; Shimono, Mitsugu; et al.

no journal, , 

no abstracts in English

Oral presentation

Trajectory analysis of multi beam in negative ion source on JT-60U NBI system

Kamada, Masaki; Hanada, Masaya; Ikeda, Yoshitaka; Jiang, W.*

no journal, , 

no abstracts in English

Oral presentation

Next mass data acquisition system; prototype MDAS testing, 2

Oshima, Takayuki; Kiyono, Kimihiro; Sakata, Shinya; Sato, Minoru; Ozeki, Takahisa

no journal, , 

no abstracts in English

Oral presentation

Instability in the frequency range of Alfv$'e$n eigenmode driven by Negative-ion-based Neutral Beam in JT-60U

Shinohara, Koji; Ishikawa, Masao; Takechi, Manabu; Kusama, Yoshinori; Todo, Yasushi*; Fukuyama, Atsushi*; Matsunaga, Go; Ozeki, Takahisa

no journal, , 

no abstracts in English

Oral presentation

Power flow design and requirements for plasma facing materials in DEMO plant

Tobita, Kenji

no journal, , 

no abstracts in English

Oral presentation

Long sustainment of high beta plasmas in JT-60U

Oyama, Naoyuki; Isayama, Akihiko; Suzuki, Takahiro; Koide, Yoshihiko; Takenaga, Hidenobu; Ide, Shunsuke; Nakano, Tomohide; Asakura, Nobuyuki; Kubo, Hirotaka; Takechi, Manabu; et al.

no journal, , 

no abstracts in English

Oral presentation

Development of heterodyne reception system using band pass filter array

Sakoda, Takuya*; Kogi, Yuichiro*; Mase, Atsushi*; Ito, Naoki*; Nagayama, Yoshio*; Yamaguchi, Soichiro*; Kawahata, Kazuo*; Sakata, Eiji*; Oyama, Naoyuki

no journal, , 

no abstracts in English

Oral presentation

Stability of resistive wall mode in JT-60U high beta plasmas

Takechi, Manabu; Matsunaga, Go; Ozeki, Takahisa; Aiba, Nobuyuki; Kurita, Genichi; Isayama, Akihiko; Koide, Yoshihiko; Sakamoto, Yoshiteru; Fujita, Takaaki; Kamada, Yutaka; et al.

no journal, , 

no abstracts in English

Oral presentation

Disruptions on low beta in JT-60U reversed shear plasmas

Urasaki, Hisashi*; Takechi, Manabu; Matsunaga, Go; Isayama, Akihiko; Koide, Yoshihiko; Sakamoto, Yoshiteru; Fujita, Takaaki; Tsutsui, Hiroaki*; Iio, Shunji*; Shimada, Ryuichi*; et al.

no journal, , 

no abstracts in English

78 (Records 1-20 displayed on this page)