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Start Over Author "Matsunaga, G." Journal physical review letters
12 results on '"Matsunaga, G."'

3. Transition between Internal Transport Barriers with Different Temperature-Profile Curvatures in JT-60U Tokamak Plasmas

Author

Ida, K., primary, Sakamoto, Y., additional, Takenaga, H., additional, Oyama, N., additional, Itoh, K., additional, Yoshinuma, M., additional, Inagaki, S., additional, Kobuchi, T., additional, Isayama, A., additional, Suzuki, T., additional, Fujita, T., additional, Matsunaga, G., additional, Koide, Y., additional, Yoshida, M., additional, Ide, S., additional, and Kamada, Y., additional

Published
2008
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6. Forced Magnetic Reconnection and Field Penetration of an Externally Applied Rotating Helical Magnetic Field in the TEXTOR Tokamak

Author

Kikuchi, Y., primary, de Bock, M. F. M., additional, Finken, K. H., additional, Jakubowski, M., additional, Jaspers, R., additional, Koslowski, H. R., additional, Kraemer-Flecken, A., additional, Lehnen, M., additional, Liang, Y., additional, Matsunaga, G., additional, Reiser, D., additional, Wolf, R. C., additional, and Zimmermann, O., additional

Published
2006
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8. Toroidal Plasma Rotation Induced by the Dynamic Ergodic Divertor in the TEXTOR Tokamak

Author

Finken, K. H., primary, Abdullaev, S. S., additional, de Bock, M. F. M., additional, von Hellermann, M., additional, Jakubowski, M., additional, Jaspers, R., additional, Koslowski, H. R., additional, Krämer-Flecken, A., additional, Lehnen, M., additional, Liang, Y., additional, Nicolai, A., additional, Wolf, R. C., additional, Zimmermann, O., additional, de Baar, M., additional, Bertschinger, G., additional, Biel, W., additional, Brezinsek, S., additional, Busch, C., additional, Donné, A. J. H., additional, Esser, H. G., additional, Farshi, E., additional, Gerhauser, H., additional, Giesen, B., additional, Harting, D., additional, Hoekzema, J. A., additional, Hogeweij, G. M. D., additional, Hüttemann, P. W., additional, Jachmich, S., additional, Jakubowska, K., additional, Kalupin, D., additional, Kelly, F., additional, Kikuchi, Y., additional, Kirschner, A., additional, Koch, R., additional, Korten, M., additional, Kreter, A., additional, Krom, J., additional, Kruezi, U., additional, Lazaros, A., additional, Litnovsky, A., additional, Loozen, X., additional, Lopes Cardozo, N. J., additional, Lyssoivan, A., additional, Marchuk, O., additional, Matsunaga, G., additional, Mertens, Ph., additional, Messiaen, A., additional, Neubauer, O., additional, Noda, N., additional, Philipps, V., additional, Pospieszczyk, A., additional, Reiser, D., additional, Reiter, D., additional, Rogister, A. L., additional, Sakamoto, M., additional, Savtchkov, A., additional, Samm, U., additional, Schmitz, O., additional, Schorn, R. P., additional, Schweer, B., additional, Schüller, F. C., additional, Sergienko, G., additional, Spatschek, K. H., additional, Telesca, G., additional, Tokar, M., additional, Uhlemann, R., additional, Unterberg, B., additional, Van Oost, G., additional, Van Rompuy, T., additional, Van Wassenhove, G., additional, Westerhof, E., additional, Weynants, R., additional, Wiesen, S., additional, and Xu, Y. H., additional

Published
2005
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9. Energetic-Ion-Driven Toroidal Alfvén Eigenmodes Observed in a Heliotron/Torsatron Plasma

Author

Takechi, M., primary, Toi, K., additional, Takagi, S., additional, Matsunaga, G., additional, Ohkuni, K., additional, Ohdachi, S., additional, Akiyama, R., additional, Darrow, D. S., additional, Fujisawa, A., additional, Gotoh, M., additional, Idei, H., additional, Iguchi, H., additional, Isobe, M., additional, Kondo, T., additional, Kojima, M., additional, Kubo, S., additional, Lee, S., additional, Minami, T., additional, Morita, S., additional, Matsuoka, K., additional, Nishimura, S., additional, Okamura, S., additional, Osakabe, M., additional, Sasao, M., additional, Shimizu, M., additional, Takahashi, C., additional, Tanaka, K., additional, and Yoshimura, Y., additional

Published
1999
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10. Observation of a complex multistage transition in the JT-60U H-mode edge.

Author

Kamiya K, Ida K, Sakamoto Y, Matsunaga G, Kojima A, Urano H, Oyama N, Koide Y, and Kamada Y

Abstract

A complex multistage transition of the edge radial electric field is observed in JT-60U H-mode phase without edge localized mode. An interesting feature is that the poloidal rotation velocity of the carbon impurity ions changes in the later H-phase without a comparable change in the main ion pressure gradient, indicating a change in the parallel momentum (and particle) balance channel.

Published
2010
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11. Observation of an energetic-particle-driven instability in the wall-stabilized high-beta plasmas in the JT-60U tokamak.

Author

Matsunaga G, Aiba N, Shinohara K, Sakamoto Y, Isayama A, Takechi M, Suzuki T, Oyama N, Asakura N, Kamada Y, and Ozeki T

Abstract

We have observed a bursting mode in the high-beta plasmas above the ideal beta limit without a conducting wall. The mode frequency is chirping down as the mode amplitude increases, and its initial value is close to the precession frequency of the trapped energetic particle from the perpendicular neutral beams. The mode structure is radially extended with a peak around the q = 2 surface. This mode can finally trigger the resistive wall mode (RWM) despite enough plasma rotation for RWM stabilization. It is concluded that the mode is driven by trapped energetic particles. The mode is attributed to the interaction between the trapped energetic particles and a marginally stable mode in the wall-stabilized high-beta_{N} region.

Published
2009
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12. Inward turbulent transport produced by positively sheared radial electric field in stellarators.

Author

Shats MG, Toi K, Ohkuni K, Yoshimura Y, Osakabe M, Matsunaga G, Isobe M, Nishimura S, Okamura S, and Matsuoka K

Abstract

Inward turbulent particle transport observed in the rf heated plasma of the H-1 toroidal heliac is reproduced in the CHS heliotron/torsatron by generating a region of positive radial electric field shear (E'(r)>0) using electron cyclotron resonance heating of the plasma edge. Empirical condition of the radial reversal of the turbulent flux derived from two experiments indicates that the shear electric field might be universally responsible for the recorrelation of the density and plasma potential fluctuations leading to the inward transport.

Published
2000
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