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Spatial, temporal and spectral structure of the turbulence-flow interaction at the L-H transition

  • Author(s): Estrada, T
  • Ascasíbar, E
  • Blanco, E
  • Cappa, A
  • Diamond, PH
  • Happel, T
  • Hidalgo, C
  • Liniers, M
  • Ph Van Milligen, B
  • Pastor, I
  • Tafalla, D
  • et al.
Abstract

The physical mechanisms behind the L-H transition have been experimentally studied in the TJ-II plasmas. The spatial, temporal and spectral structure of the interaction between turbulence and flows has been studied close to the L-H transition threshold conditions. The temporal dynamics of the turbulence-flow interaction displays a predator-prey relationship and both, radial outward and inward propagation velocities of the turbulence-flow front have been measured. Moreover, the turbulence scales involved in the energy transfer of the predator-prey process have been identified. © 2012 IOP Publishing Ltd.

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