scholarly journals Gyrokinetic Studies of Ion Temperature Gradient Turbulence and Zonal Flows in Helical Systems

2008 ◽  
Vol 3 ◽  
pp. 041-041 ◽  
Author(s):  
Hideo SUGAMA ◽  
Tomo-Hiko WATANABE ◽  
Sergi FERRANDO-MARGALET
Keyword(s):  
Temperature Gradient ◽  
Ion Temperature ◽  
Ion Temperature Gradient ◽  
Zonal Flows

Zonal flows and transport in ion temperature gradient turbulence

2002 ◽  
Vol 9 (12) ◽  
pp. 4911-4916 ◽  
Author(s):  
Sheikh Dastgeer ◽  
Sangeeta Mahajan ◽  
Jan Weiland
Keyword(s):  
Temperature Gradient ◽  
Ion Temperature ◽  
Ion Temperature Gradient ◽  
Zonal Flows

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.

Generation of zonal flows by ion-temperature-gradient and related modes in the presence of neoclassical viscosity

2006 ◽  
Vol 13 (5) ◽  
pp. 052516 ◽  
Author(s):  
A. B. Mikhailovskii ◽  
A. I. Smolyakov ◽  
E. A. Kovalishen ◽  
M. S. Shirokov ◽  
V. S. Tsypin ◽  
...  
Keyword(s):  
Temperature Gradient ◽  
Ion Temperature ◽  
Ion Temperature Gradient ◽  
Zonal Flows

scholarly journals Enstrophy non-conservation and the forward cascade of energy in two-dimensional electrostatic magnetized plasma turbulence

2020 ◽  
Vol 86 (4) ◽  
Author(s):  
G. G. Plunk
Keyword(s):  
Temperature Gradient ◽  
Plasma Turbulence ◽  
Magnetized Plasma ◽  
Larmor Radius ◽  
Ion Temperature ◽  
Fluid System ◽  
Ion Temperature Gradient ◽  
Zonal Flows ◽  
Electron Temperature Gradient ◽  
Enstrophy Cascade

A fluid system is derived to describe electrostatic magnetized plasma turbulence at scales somewhat larger than the Larmor radius of a given species. It is related to the Hasegawa–Mima equation, but does not conserve enstrophy, and, as a result, exhibits a forward cascade of energy, to small scales. The inertial-range energy spectrum is argued to be shallower than a $-11/3$ power law, as compared to the $-5$ law of the Hasegawa–Mima enstrophy cascade. This property, confirmed here by direct numerical simulations of the fluid system, may help explain the fluctuation spectrum observed in gyrokinetic simulations of streamer-dominated electron-temperature-gradient driven turbulence (Plunk et al., Phys. Rev. Lett., vol. 122, 2019, 035002), and also possibly some cases of ion-temperature-gradient driven turbulence where zonal flows are suppressed (Plunk et al., Phys. Rev. Lett., vol. 118, 2017, 105002).

Gyrokinetic simulation of zonal flows and ion temperature gradient turbulence in helical systems

2007 ◽  
Vol 47 (9) ◽  
pp. 1383-1390 ◽  
Author(s):  
T.-H. Watanabe ◽  
H. Sugama ◽  
S. Ferrando-Margalet
Keyword(s):  
Temperature Gradient ◽  
Ion Temperature ◽  
Ion Temperature Gradient ◽  
Zonal Flows
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