Physics of internal transport barrier of toroidal helical plasmas

K. Itoh; S. Toda; A. Fujisawa; S. I. Itoh; M. Yagi; A. Fukuyama; P. H. Diamond; K. Ida

doi:10.1063/1.2435310

Physics of internal transport barrier of toroidal helical plasmas

K. Itoh, S. Toda, A. Fujisawa, S. I. Itoh, M. Yagi, A. Fukuyama, P. H. Diamond, K. Ida

Division of Nuclear Fusion Dynamics

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26 Citations (Scopus)

Abstract

The role of zonal flows (ZFs) in the formation of an internal transport barrier in a toroidal helical plasma is analyzed. The turbulent transport coefficient is shown to be suppressed when the plasma state changes from the branch of a weak negative radial electric field to the strong positive one. This new transition of turbulent transport is caused by the change of the damping rate of the ZFs. It is clearly demonstrated, theoretically and experimentally, that the damping rate of the ZFs governs the global confinement of toroidal plasmas.

Original language	English
Article number	020702
Journal	Physics of Plasmas
Volume	14
Issue number	2
DOIs	https://doi.org/10.1063/1.2435310
Publication status	Published - 2007

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1063/1.2435310

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title = "Physics of internal transport barrier of toroidal helical plasmas",

abstract = "The role of zonal flows (ZFs) in the formation of an internal transport barrier in a toroidal helical plasma is analyzed. The turbulent transport coefficient is shown to be suppressed when the plasma state changes from the branch of a weak negative radial electric field to the strong positive one. This new transition of turbulent transport is caused by the change of the damping rate of the ZFs. It is clearly demonstrated, theoretically and experimentally, that the damping rate of the ZFs governs the global confinement of toroidal plasmas.",

author = "K. Itoh and S. Toda and A. Fujisawa and Itoh, {S. I.} and M. Yagi and A. Fukuyama and Diamond, {P. H.} and K. Ida",

note = "Funding Information: This work was partly supported by the Grant-in-Aid for Specially Promoted Research (16002005) and the Grant-in-Aid for Scientific Research (15360495), by the collaboration programs of NIFS (NIFS06KDAD005 and NIFS03KKMD001) and of the RIAM of Kyushu University, and by the Asada Science foundation.",

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doi = "10.1063/1.2435310",

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T1 - Physics of internal transport barrier of toroidal helical plasmas

AU - Itoh, K.

AU - Toda, S.

AU - Fujisawa, A.

AU - Itoh, S. I.

AU - Yagi, M.

AU - Fukuyama, A.

AU - Diamond, P. H.

AU - Ida, K.

N1 - Funding Information: This work was partly supported by the Grant-in-Aid for Specially Promoted Research (16002005) and the Grant-in-Aid for Scientific Research (15360495), by the collaboration programs of NIFS (NIFS06KDAD005 and NIFS03KKMD001) and of the RIAM of Kyushu University, and by the Asada Science foundation.

PY - 2007

Y1 - 2007

N2 - The role of zonal flows (ZFs) in the formation of an internal transport barrier in a toroidal helical plasma is analyzed. The turbulent transport coefficient is shown to be suppressed when the plasma state changes from the branch of a weak negative radial electric field to the strong positive one. This new transition of turbulent transport is caused by the change of the damping rate of the ZFs. It is clearly demonstrated, theoretically and experimentally, that the damping rate of the ZFs governs the global confinement of toroidal plasmas.

AB - The role of zonal flows (ZFs) in the formation of an internal transport barrier in a toroidal helical plasma is analyzed. The turbulent transport coefficient is shown to be suppressed when the plasma state changes from the branch of a weak negative radial electric field to the strong positive one. This new transition of turbulent transport is caused by the change of the damping rate of the ZFs. It is clearly demonstrated, theoretically and experimentally, that the damping rate of the ZFs governs the global confinement of toroidal plasmas.

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DO - 10.1063/1.2435310

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Physics of internal transport barrier of toroidal helical plasmas

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