A
Akihiko Isayama
Researcher at Japan Atomic Energy Agency
Publications - 206
Citations - 5696
Akihiko Isayama is an academic researcher from Japan Atomic Energy Agency. The author has contributed to research in topics: Tokamak & Plasma. The author has an hindex of 36, co-authored 202 publications receiving 5264 citations. Previous affiliations of Akihiko Isayama include Japan Atomic Energy Research Institute.
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Journal ArticleDOI
Chapter 3: MHD stability, operational limits and disruptions
T. C. Hender,J.C. Wesley,J.M. Bialek,Anders Bondeson,Allen H. Boozer,R.J. Buttery,Am Garofalo,Timothy Goodman,Robert Granetz,Y. Gribov,O. Gruber,Mikhail Gryaznevich,G. Giruzzi,Sibylle Günter,Nobuhiko Hayashi,Per Helander,Chris Hegna,D. F. Howell,D.A. Humphreys,G. T. A. Huysmans,A.W. Hyatt,Akihiko Isayama,Stephen Jardin,Yasunori Kawano,A. Kellman,C.E. Kessel,H. R. Koslowski,R. J. La Haye,E. Lazzaro,Yueqiang Liu,V.E. Lukash,J. Manickam,S. Medvedev,V. Mertens,S. V. Mirnov,Y. Nakamura,G.A. Navratil,M. Okabayashi,Takahisa Ozeki,Roberto Paccagnella,G. Pautasso,F. Porcelli,V. D. Pustovitov,V. Riccardo,M. Sato,Olivier Sauter,M.J. Schaffer,Michiya Shimada,Piergiorgio Sonato,E. J. Strait,M. Sugihara,Manabu Takechi,A. D. Turnbull,E. Westerhof,D.G. Whyte,R. Yoshino,H. Zohm +56 more
TL;DR: A review of recent advances in the area of MHD stability and disruptions, since the publication of the 1999 ITER Physics Basis document (1999 Nucl. Fusion 39 2137-2664), is reviewed in this paper.
Journal ArticleDOI
Complete stabilization of a tearing mode in steady state high-βp H-mode discharges by the first harmonic electron cyclotron heating/current drive on JT-60U
Akihiko Isayama,Yutaka Kamada,Shunsuke Ide,Kiyotaka Hamamatsu,T. Oikawa,T. Suzuki,Yuzuru Neyatani,T. Ozeki,Y. Ikeda,K. Kajiwara +9 more
TL;DR: In this article, a tearing mode with m = 3 and n = 2, destabilized in the steady state high-βp H-mode discharges with edge localized mode (ELM), was completely stabilized by local heating and current drive using the 110 GHz first harmonic O-mode electron cyclotron (EC) wave.
Journal ArticleDOI
Cross–machine benchmarking for ITER of neoclassical tearing mode stabilization by electron cyclotron current drive
R. J. La Haye,R. Prater,R.J. Buttery,Nobuhiko Hayashi,Akihiko Isayama,M. Maraschek,L. Urso,H. Zohm +7 more
TL;DR: In this article, a common methodology is developed for fitting the saturated m/n = 3/2 island before (or without) ECCD in all four experimental devices, ASDEX upgrade, DIII-D, JET and JT-60U.
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Achievement of high fusion triple product, steady-state sustainment and real-time NTM stabilization in high-βp ELMy H-mode discharges in JT-60U
Akihiko Isayama,Yutaka Kamada,N. Hayashi,T. Suzuki,T. Oikawa,T. Fujita,T. Fukuda,Shunsuke Ide,Hidenobu Takenaga,Kenkichi Ushigusa,T. Ozeki,Y. Ikeda,Naotaka Umeda,Hiroshi Yamada,Mitsutaka Isobe,Y. Narushima,Katsunori Ikeda,Satoru Sakakibara,K. Yamazaki,Kazunobu Nagasaki +19 more
TL;DR: In this paper, a steady-state high-βp ELMy H-mode discharges in JT-60U were reported, and a fusion triple product, nD(0)τETi(0), of 3.1 × 1020 m−3 s keV under full non-inductive current drive was achieved at Ip = 1.8 MA.
Journal ArticleDOI
Disappearance of giant ELMs and appearance of minute grassy ELMs in JT-60U high-triangularity discharges
Yutaka Kamada,T. Oikawa,L.L. Lao,Tomonori Takizuka,T. Hatae,Akihiko Isayama,J Manickam,M. Okabayashi,T. Fukuda,K Tsuchiya +9 more
TL;DR: In this article, the edge temperature and pressure in the grassy ELMy H-mode were investigated and the edge stability analysis showed that the edge plasma is accessing the second stability regime of the high n ballooning mode.