Turbulence elasticity - A new mechanism for transport barrier dynamics

Z. B. Guo, P. H. Diamond, Yusuke Kosuga, Ö D. Gürcan

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We present a new, unified model of transport barrier formation in " elastic" drift wave-zonal flow (DW-ZF) turbulence. A new physical quantity - the delay time (i.e., the mixing time for the DW turbulence) - is demonstrated to parameterize each stage of the transport barrier formation. Quantitative predictions for the onset of limit-cycle-oscillation (LCO) among DW and ZF intensities (also denoted as I-mode) and I-mode to high-confinement mode (H-mode) transition are also given. The LCO occurs when the ZF shearing (|〈v〉ZF′|) enters the regime Δωk<|〈V〉 ZF′|<τcr-1, where Δωk is the local turbulence decorrelation rate and τcr is the threshold delay time. In the basic predator-prey feedback system, τcr is also derived. The I-H transition occurs when |〈V〉E×B′|>τ cr-1, where the mean E×B shear flow driven by ion pressure "locks" the DW-ZF system to the H-mode by reducing the delay time below the threshold value.

Original languageEnglish
Article number090702
JournalPhysics of Plasmas
Volume21
Issue number9
DOIs
Publication statusPublished - Jan 1 2014

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elastic properties
turbulence
time lag
oscillations
cycles
shearing
shear flow
thresholds
predictions
ions

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Turbulence elasticity - A new mechanism for transport barrier dynamics. / Guo, Z. B.; Diamond, P. H.; Kosuga, Yusuke; Gürcan, Ö D.

In: Physics of Plasmas, Vol. 21, No. 9, 090702, 01.01.2014.

Research output: Contribution to journalArticle

Guo, Z. B. ; Diamond, P. H. ; Kosuga, Yusuke ; Gürcan, Ö D. / Turbulence elasticity - A new mechanism for transport barrier dynamics. In: Physics of Plasmas. 2014 ; Vol. 21, No. 9.
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