Transport analysis of the effect of zonal flows on electron internal transport barriers in toroidal helical plasmas

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

doi:10.1088/0029-5515/47/8/024

Transport analysis of the effect of zonal flows on electron internal transport barriers in toroidal helical plasmas

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

Division of Nuclear Fusion Dynamics

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

Abstract

The role of zonal flows in the formation of transport barrier in helical plasmas is analysed using the transport code. A set of one-dimensional transport equations is analysed, including the effect of zonal flows. The turbulent transport coefficient is shown to be suppressed when the plasma state takes the strong positive radial electric field. This bifurcation of the turbulent transport is newly caused by the change of the damping rate of zonal flows. It is theoretically demonstrated that the damping rate of zonal flows plays an important role in global confinement in toroidal plasmas.

Original language	English
Article number	024
Pages (from-to)	914-919
Number of pages	6
Journal	Nuclear Fusion
Volume	47
Issue number	8
DOIs	https://doi.org/10.1088/0029-5515/47/8/024
Publication status	Published - Aug 1 2007

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Condensed Matter Physics

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AU - Toda, S.

AU - Itoh, K.

AU - Fujisawa, A.

AU - Itoh, S. I.

AU - Yagi, M.

AU - Fukuyama, A.

AU - Diamond, P. H.

AU - Ida, K.

PY - 2007/8/1

Y1 - 2007/8/1

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AB - The role of zonal flows in the formation of transport barrier in helical plasmas is analysed using the transport code. A set of one-dimensional transport equations is analysed, including the effect of zonal flows. The turbulent transport coefficient is shown to be suppressed when the plasma state takes the strong positive radial electric field. This bifurcation of the turbulent transport is newly caused by the change of the damping rate of zonal flows. It is theoretically demonstrated that the damping rate of zonal flows plays an important role in global confinement in toroidal plasmas.

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Transport analysis of the effect of zonal flows on electron internal transport barriers in toroidal helical plasmas

Abstract

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