Turbulence elasticity: A key concept to a unified paradigm of L→I→H transition

Z. B. Guo, P. H. Diamond, Y. Kosuga, D. Gürcan

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We present a theory of turbulence elasticity, which follows from delayed response of drift waves (DWs) to zonal flow (ZF) shears. It is shown that when |V′ZF|/Δωk1, with |V′ZF| the ZF shearing rate and Δωk the local turbulence decorrelation rate, the ZF evolution equation is converted from a diffusion equation to a telegraph equation. This insight provides a natural framework for understanding temporally periodic ZF structures, e.g., propagation of the ZF/turbulence intensity fronts. Furthermore, by incorporating the elastic property of the DW-ZF turbulence, we propose a unified paradigm of low-confinement-mode to intermediate-confinement-mode to high-confinement-mode (L→I→H) transitions. In particular, we predict the onset and termination conditions of the limit cycle oscillations, i.e. the I-mode. The transition from an unstable L-mode to I-mode is predicted to occur when Δωk<|V′ZF|<V′cr, where V′cr is a critical flow shearing rate and is derived explicitly. If |V′E×B|>V′cr (VEB is mean E×B shear flow driven by edge radial electrostatic field), the I-mode will terminate and spiral into the H-mode.

Original languageEnglish
Article number043022
JournalNuclear Fusion
Volume55
Issue number4
DOIs
Publication statusPublished - Apr 1 2015

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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