Kyushu University Academic Staff Educational and Research Activities Database
List of Presentations
Takuma Yamada Last modified date:2021.06.17

Professor / Division for Experimental Natural Science / Faculty of Arts and Science


Presentations
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, Inagaki Shigeru, Tatsuya Kobayashi, Yoshihiko Nagashima, Tomohiro Mitsuzono, Yudai Miwa, Kousuke Nakanishi, Hiromitsu Fujino, Makoto Sasaki, Naohiro Kasuya, Maxime Lesur, Yusuke Kosuga, Akihide Fujisawa, SANAE INOUE(論文のみ) ITOH, Kimitaka Itoh, Formation of streamer structures in linear magnetized plasmas, 14th International Workshop on H-mode Physics and Transport Barriers, 2013.10.
4. Takuma Yamada, Streamer structures in experiment and modeling, 22nd International Toki Conference on Cross-Validation of Experiment and Modeling for Fusion and Astrophysical Plasmas, 2012.11.
5. Takuma Yamada, Localized electron heating in merging spherical tokamaks, 39th European Physical Society Conference on Plasma Physics / 16th International Congress on Plasma Physics, 2012.07.
6. Takuma Yamada, Merging startup experiments in UTST and MAST, Joint Meeting of the 5th IAEA Technical Meeting on Spherical Tori and the 16th International Workshop on Spherical Torus, 2011.09.
7. Takuma Yamada, Experimental investigation of streamers, Workshop on Electric Fields, Turbulence and Self-Organisation in Magnetized Plasmas 2011, 2011.07.
8. Takuma Yamada, Observation of a streamer in drift wave turbulence, 1st Asia Pacific Transport Working Group International Conference, 2011.06.
9. Takuma Yamada, Magnetic reconnections studies on MAST, US-Japan Workshop on Magnetic Reconnection 2010, 2010.12.
10. Takuma Yamada, Double null merging start-up Experiments on UTST, 52nd Annual Meeting of the APS Division of Plasma Physics, 2010.11.
11. Takuma Yamada, Double Null Merging Start-up Experiments in the Univerity of Tokyo Spherical Tokamak, 23rd IAEA Fusion Energy Conference, 2010.10.
12. Takuma Yamada, Merging start-up and sustainment experiments on the UTST spherical tokamak, 19th International Toki Conference on Advanced Physics in Plasma and Fusion Research, 2009.12.
13. Takuma Yamada, Nonlinear mode couplings in a cylindrical magnetized plasma, 19th International Toki Conference on Advanced Physics in Plasma and Fusion Research, 2009.12.
14. Takuma Yamada, Spherical tokamak start-up and sustainment experiments on UTST, 51st Annual Meeting of the APS Division of Plasma Physics, 2009.11.
15. Takuma Yamada, Merging Start-up and Sustainment Experiments on UTST, International Spherical Torus Workshop 2009, 2009.10.
16. Takuma Yamada, Initial Results from the UTST Spherical Tokamak Experiment, Joint Meeting of the 4th IAEA Technical Meeting on Spherical Tori and the 14th International Workshop on Spherical Torus, 2008.10.
17. Takuma Yamada, Measurement of Drift Wave Turbulence in the Large Mirror Device-Upgrade, International Congress on Plasma Physics 2008, 2008.09.
18. Takuma Yamada, Nonlinear mode couplings in linear plasmas, US-Japan Workshop on Magnetic Reconnection 2008, 2008.03.
19. Takuma Yamada, Nonlinear coupling between drift waves and streamers in LMD-U, 49th Annual Meeting of the APS Division of Plasma Physics, 2007.11.
20. Takuma Yamada, Spatiotemporal behavior of drift waves in LMD-U, 17th International Toki Conference on Physics of Flows and Turbulence in Plasmas and 16th International Stellarator/Heliotron Workshop 2007, 2007.10.
21. Takuma Yamada, Reflectometry for Density Fluctuation and Profile Measurements in TST-2, 16th International Toki Conference on Advanced Imaging and Plasma Diagnostics, 2006.12.