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Physics of internal transport barrier of toroidal helical plasmas

  • Author(s): Itoh, K
  • Toda, S
  • Fujisawa, A
  • Itoh, SI
  • Yagi, M
  • Fukuyama, A
  • Diamond, PH
  • Ida, K
  • et al.

Published Web Location

https://doi.org/10.1063/1.2435310Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Public License
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. © 2007 American Institute of Physics.

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