Y
Yutaka Kamada
Researcher at Japan Atomic Energy Research Institute
Publications - 72
Citations - 3337
Yutaka Kamada is an academic researcher from Japan Atomic Energy Research Institute. The author has contributed to research in topics: Plasma & Tokamak. The author has an hindex of 33, co-authored 72 publications receiving 3185 citations. Previous affiliations of Yutaka Kamada include Helsinki University of Technology & Japan Atomic Energy Agency.
Papers
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Journal ArticleDOI
Internal transport barrier on q=3 surface and poloidal plasma spin up in JT-60U high- beta p discharges.
Y. Koide,Kikuchi Mitsuru,M. Mori,Shunji Tsuji,S. Ishida,Nobuyuki Asakura,Yutaka Kamada,Takeo Nishitani,Yasunori Kawano,T. Hatae,Takaaki Fujita,T. Fukuda,Akira Sakasai,Takashi Kondoh,Ryuji Yoshino,Yuzuru Neyatani +15 more
TL;DR: A fast magnetohydrodynamic event localized at the transport barrier triggered the subsequent formation of an edge transport barrier that resulted in the further confinement improvement in the JT-60U tokamak discharges.
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.
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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.
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Energy loss for grassy ELMs and effects of plasma rotation on the ELM characteristics in JT-60U
Naoyuki Oyama,Yoshiteru Sakamoto,Akihiko Isayama,M. Takechi,P. Gohil,L.L. Lao,P. B. Snyder,T. Fujita,Shunsuke Ide,Yutaka Kamada,Y.M. Miura,T. Oikawa,T. Suzuki,Hidenobu Takenaga,K. Toi +14 more
TL;DR: In this article, the authors investigated the energy loss for grassy edge localized modes (ELMs) to investigate the applicability of the grassy ELM regime to ITER, which is characterized by high frequency periodic collapses of 800-1500 Hz.