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Takuma Yamada Last modified date:2021.06.17

Graduate School
Other Organization

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 Reseacher Profiling Tool Kyushu University Pure
Academic Degree
Doctor(Science)(The University of Tokyo)
Country of degree conferring institution (Overseas)
Field of Specialization
Plasma Physics
Total Priod of education and research career in the foreign country
Outline Activities
(Research) Experimental study of meso-scale structures generated in plasma turubulence and merging startup of spherical tokamak plasma.
(Education) Working on KIKAN education, subject organizing team (physics), and organization and IUPE class of Basic Laboratory Experiments (physics).
Research Interests
  • Merging startup of spherical tokamak
    keyword : spherical tokamak, merging, magnetic reconnection
  • Structure formation in turbulent plasma
    keyword : plasma, turbulence, non-linear coupling
Academic Activities
1. Takuma Yamada, H. Tanabe, T. G. Watanabe, Y. Hayashi, R. Imazawa, M. Inomoto, Y. Ono, M. Gryaznevich, R. Scannell, C. Michael, Localized electron heating during magnetic reconnection in MAST, NUCLEAR FUSION, 10.1088/0029-5515/56/10/106019, 56, 10, 106019, 2016.10.
2. Takuma Yamada, SANAE INOUE(論文のみ) ITOH, Inagaki Shigeru, Yoshihiko Nagashima, Naohiro Kasuya, KAMATAKI KUNIHIRO, Hiroyuki Arakawa, Tatsuya Kobayashi, MASATOSHI YAGI, Akihide Fujisawa, Kimitaka Itoh, Observation of Quasi-Two-Dimensional Nonlinear Interactions in a Drift-Wave Streamer, PHYSICAL REVIEW LETTERS, 10.1103/PhysRevLett.105.225002, 105, 22, 225002, 2010.11.
3. Takuma Yamada, SANAE INOUE(論文のみ) ITOH, Inagaki Shigeru, Yoshihiko Nagashima, Shunjiro Shinohara, Naohiro Kasuya, Kenichiro Terasaka, KAMATAKI KUNIHIRO, Hiroyuki Arakawa, MASATOSHI YAGI, Akihide Fujisawa, Kimitaka Itoh, Two-dimensional bispectral analysis of drift wave turbulence in a cylindrical plasma, PHYSICS OF PLASMAS, 10.1063/1.3429674, 17, 5, 052313, 2010.05.
4. Takuma Yamada, SANAE INOUE(論文のみ) ITOH, Takashi Maruta, Naohiro Kasuya, Yoshihiko Nagashima, Shunjiro Shinohara, Kenichiro Terasaka, MASATOSHI YAGI, Inagaki Shigeru, Yoshinobu Kawai, Akihide Fujisawa, Kimitaka Itoh, Anatomy of plasma turbulence, NATURE PHYSICS, 10.1038/nphys1029, 4, 9, 721-725, 2008.07.
1. Takuma Yamada, Shigeru Inagaki, Makoto Sasaki, Yoshihiko Nagashima, F. Kin, Hiroyuki Arakawa, Tatsuya Kobayashi, Kotaro Yamasaki, Naohiro Kasuya, Yusuke Kosuga, Akihide Fujisawa, Kimitaka Itoh, Sanae-I. Itoh, Three Dimensional Structure of Streamer in Drift Wave Fluctuations, 2nd Asia-Pacific Conference on Plasma Physics, 2018.11, Mesoscale structures such as zonal flows and streamers play important roles in transport. The streamer can have a three-dimensional (3D) structure, by which the turbulence driven transport can be enhanced. Using the linear magnetized plasma device, the streamer structure and its mediator mode were found experimentally. The cross-sectional structures of the streamer, its mediator mode, and carrier waves were observed in detail, and it was found that they are highly comparable to those of theoretical and numerical works. Here we report the 3D structures of the streamer and its carrier waves and mediator, which are observed in a linear plasma device for the first time. Not only the cross-sectional structure but also the axial structure was observed. While the carrier drift waves, which form the streamer structure by nonlinear interaction, has an axial mode number of 1, the streamer and mediator had an axial mode number of 0. The relationship of these axial mode numbers is explained by the matching condition of the nonlinear interaction between the carrier waves and the mediator..
2. Takuma Yamada, Inagaki Shigeru, Tatsuya Kobayashi, Yoshihiko Nagashima, Yudai Miwa, Kousuke Nakanishi, Makoto Sasaki, Naohiro Kasuya, Maxime Lesur, Yusuke Kosuga, Akihide Fujisawa, SANAE INOUE(論文のみ) ITOH, Kimitaka Itoh, Streamer and Nonlinear Coupling with Turbulence, 4th Asia Pacific Transport Working Group International Conference, 2014.06.
3. Takuma Yamada, Experimental investigation of streamers, Workshop on Electric Fields, Turbulence and Self-Organisation in Magnetized Plasmas 2011, 2011.07.
4. Takuma Yamada, Observation of a streamer in drift wave turbulence, 1st Asia Pacific Transport Working Group International Conference, 2011.06.
Membership in Academic Society
  • The Japan Society of Plasma Science and Nuclear Fusion Research
  • The Physical Society of Japan
  • Discovery and study of streamer structure in plasma turbulence
Educational Activities
In charge of KIKAN education (including physics) and graduate classes (IGSES).