scholarly journals Understanding nonlinear saturation in zonal-flow-dominated ion temperature gradient turbulence

2015 ◽  
Vol 57 (4) ◽  
pp. 045005 ◽  
Author(s):  
G G Plunk ◽  
A Bañón Navarro ◽  
F Jenko
Keyword(s):  
Temperature Gradient ◽  
Zonal Flow ◽  
Ion Temperature ◽  
Nonlinear Saturation ◽  
Ion Temperature Gradient

scholarly journals Coherent structures in ion temperature gradient turbulence-zonal flow

2014 ◽  
Vol 21 (10) ◽  
pp. 102306 ◽  
Author(s):  
Rameswar Singh ◽  
R. Singh ◽  
P. Kaw ◽  
Ö. D. Gürcan ◽  
P. H. Diamond
Keyword(s):  
Temperature Gradient ◽  
Coherent Structures ◽  
Zonal Flow ◽  
Ion Temperature ◽  
Ion Temperature Gradient

scholarly journals Secondary instability of electromagnetic ion-temperature-gradient modes for zonal flow generation

2011 ◽  
Vol 18 (7) ◽  
pp. 072306 ◽  
Author(s):  
Johan Anderson ◽  
Hans Nordman ◽  
Rameswar Singh ◽  
Raghvendra Singh
Keyword(s):  
Temperature Gradient ◽  
Zonal Flow ◽  
Secondary Instability ◽  
Ion Temperature ◽  
Ion Temperature Gradient ◽  
Flow Generation

Zonal flow in toroidal ion temperature gradient mode turbulence

2007 ◽  
Vol 73 (4) ◽  
pp. 565-573 ◽  
Author(s):  
INGMAR SANDBERG ◽  
V. P. PAVLENKO
Keyword(s):  
Temperature Gradient ◽  
Nonlinear Evolution ◽  
Zonal Flow ◽  
Shear Layers ◽  
Ion Temperature ◽  
Ion Temperature Gradient ◽  
Zonal Flows ◽  
Characteristic Oscillation ◽  
The Stability ◽  
Gradient Mode

AbstractThe properties of zonal flows in the toroidal ion temperature gradient mode turbulence are investigated taking into account the polarization drift effects. The stability criterion and the characteristic oscillation frequency of the zonal flow are determined in terms of the spectra of turbulent fluctuations. The nonlinear evolution of zonal flows may lead to the formation of stationary long-lived coherent structures supporting stationary shear layers. These results indicate the existence of regions with reduced levels of anomalous transport attributed to zonal flows generalizing previous findings regarding zonal flows in electron drift turbulence.

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