scholarly journals Nonlinear evolution of the temperature gradient instability in the midlatitude ionosphere

2014 ◽  
Vol 119 (9) ◽  
pp. 7889-7901 ◽  
Author(s):  
A. Eltrass ◽  
W. A. Scales
Keyword(s):  
Temperature Gradient ◽  
Nonlinear Evolution ◽  
Midlatitude Ionosphere ◽  
Gradient Instability

Anomalous transport driven by ion temperature gradient instability in an anisotropic deuterium-tritium plasma

2021 ◽  
Author(s):  
Debing Zhang ◽  
Limin Yu ◽  
Erbing Xue ◽  
Xianmei Zhang ◽  
Haijun Ren
Keyword(s):  
Temperature Gradient ◽  
Anomalous Transport ◽  
Equilibrium Distribution Function ◽  
Base Case ◽  
Ion Temperature ◽  
Temperature Anisotropy ◽  
Ion Temperature Gradient ◽  
Anisotropic Factor ◽  
Factor Alpha ◽  
Gradient Instability

Abstract In the nowadays and future fusion devices such as ITER and CFETR, as the use of various heating schemes, the parallel and perpendicular temperature of plasmas can be different; this temperature anisotropy may have significant effects on the turbulence. In this work, the anomalous transport driven by the ion temperature gradient instability is investigated in an anisotropic deuterium-tritium (D-T) plasma. The anisotropic factor $\alpha$, defined as the ratio of perpendicular temperature to parallel temperature, is introduced to describe the temperature anisotropy in the equilibrium distribution function of D. The linear dispersion relation in local kinetic limit is derived, and then numerically evaluated to study the dependence of mode frequency on the anisotropic factor $\alpha$ and the proportion for T particle $\vareT$ by choosing three sets of typical parameters, denoted as the cyclone base case (CBC), ITER and CFETR cases. Based on the linear results, the mixing length model approximation is adopted to analyze the quasi-linear particle and energy fluxes for D and T. It is found that choosing small $\alpha$ and large $\vareT$ is beneficial for the confinement of particle and energy for D and T. This work may be helpful for the estimation of turbulent transport level in the ITER and CFETR devices.

Collisionless electron temperature gradient instability

1987 ◽  
Vol 30 (5) ◽  
pp. 1331 ◽  
Author(s):  
Y. C. Lee ◽  
J. Q. Dong ◽  
P. N. Guzdar ◽  
C. S. Liu
Keyword(s):  
Temperature Gradient ◽  
Electron Temperature ◽  
Electron Temperature Gradient ◽  
Gradient Instability
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