NIFS-869

FULL TEXT (PDF, 1274 KB)


Author(s):

K. Itoh et al.

Title:

Physics of Electron Internal Transport Barrier in Toroidal Helical Plasmas

Date of publication:

Oct. 2006

Key words:

21 IAEA Fusion Energy Conference, PD/P6-4

Abstract:

The role of zonal flows in the formation of the transport barrier in the helical plasmas is analyzed using the transport code. A set of one-dimensional transport equations is analyzed, including the effect of zonal flows. The turbulent transport coefficient is shown to be suppressed when the plasma state changes from the weak negative radial electric field to the strong positive one. 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 governs the global confinement in toroidal plasmas.

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