scholarly journals Coupled ion temperature gradient and trapped electron mode to electron temperature gradient mode gyrokinetic simulations

2007 ◽  
Vol 14 (5) ◽  
pp. 056116 ◽  
Author(s):  
R. E. Waltz ◽  
J. Candy ◽  
M. Fahey
Keyword(s):  
Temperature Gradient ◽  
Electron Temperature ◽  
Ion Temperature ◽  
Ion Temperature Gradient ◽  
Electron Temperature Gradient ◽  
Electron Mode ◽  
Gyrokinetic Simulations ◽  
Trapped Electron ◽  
Gradient Mode

scholarly journals Transport through dissipative trapped electron mode and toroidal ion temperature gradient mode in TEXTOR

1988 ◽  
Vol 28 (6) ◽  
pp. 1053-1073 ◽  
Author(s):  
A. Rogister ◽  
G. Hasselberg ◽  
F.G. Waelbroeck ◽  
J. Weiland
Keyword(s):  
Temperature Gradient ◽  
Ion Temperature ◽  
Ion Temperature Gradient ◽  
Electron Mode ◽  
Trapped Electron ◽  
Gradient Mode

scholarly journals Gyrokinetic stability of electron–positron–ion plasmas

2018 ◽  
Vol 84 (1) ◽  
Author(s):  
A. Mishchenko ◽  
A. Zocco ◽  
P. Helander ◽  
A. Könies
Keyword(s):  
Dispersion Relation ◽  
Temperature Gradient ◽  
Electron Temperature ◽  
Alfven Wave ◽  
Ion Temperature ◽  
Slab Geometry ◽  
Ion Temperature Gradient ◽  
Electron Temperature Gradient ◽  
Electron Positron ◽  
Ion Proton

The gyrokinetic stability of electron–positron plasmas contaminated by an ion (proton) admixture is studied in a slab geometry. The appropriate dispersion relation is derived and solved. Stable K-modes, the universal instability, the ion-temperature-gradient-driven instability, the electron-temperature-gradient-driven instability and the shear Alfvén wave are considered. It is found that the contaminated plasma remains stable if the contamination degree is below some threshold and that the shear Alfvén wave can be present in a contaminated plasma in cases where it is absent without ion contamination.

Three electrostatic temperature drift instabilities

1981 ◽  
Vol 25 (1) ◽  
pp. 145-159 ◽  
Author(s):  
S. Peter Gary ◽  
Barbara Abraham-Shrauner
Keyword(s):  
Magnetic Field ◽  
Temperature Gradient ◽  
Electron Temperature ◽  
Lower Hybrid ◽  
Ion Temperature ◽  
Temperature Drift ◽  
Ion Temperature Gradient ◽  
Electron Temperature Gradient ◽  
Drift Instability ◽  
Electrostatic Dispersion

This paper considers temperature drift instabilities, modes which can be driven unstable solely by a temperature gradient perpendicular to a magnetic field. The linear electrostatic dispersion relation for a Vlasov plasma in a uniform magnetic field is used and propagation is assumed to be in the plane perpendicular to the gradient. Three temperature drift instabilities have been found. The ion temperature drift instability arises at frequencies much below the ion cyclotron frequency, the electron temperature drift instability propagates somewhat below that frequency and the lower-hybrid temperature drift instability has frequencies above the lower-hybrid frequency. The first of these modes is driven by an ion temperature gradient and is enhanced by increasing Te/Ti. The latter two modes are driven by an electron temperature gradient and are enhanced by a decreasing Te/Ti. Density gradients are considered as an additional source of free energy, and comparisons of temperature drift with density drift instabilities are made.

A possible hybrid dissipative trapped electron ion temperature gradient mode

1996 ◽  
Vol 3 (8) ◽  
pp. 3004-3012 ◽  
Author(s):  
L. Bai ◽  
X. M. Qiu ◽  
L. Huang ◽  
X. M. Song
Keyword(s):  
Temperature Gradient ◽  
Ion Temperature ◽  
Ion Temperature Gradient ◽  
Trapped Electron ◽  
Gradient Mode

Collisionless trapped-electron-mode turbulence and transport in fluid descriptions

2007 ◽  
Vol 73 (5) ◽  
pp. 731-740 ◽  
Author(s):  
H. NORDMAN ◽  
P. STRAND ◽  
X. GARBET
Keyword(s):  
Fluid Transport ◽  
Fluid Model ◽  
Transport Coefficients ◽  
Ion Temperature ◽  
Plasma Parameters ◽  
Ion Temperature Gradient ◽  
Electron Mode ◽  
Mode Tem ◽  
Gyrokinetic Simulations ◽  
Trapped Electron

AbstractA study of particle and electron heat transport in tokamaks due to trapped-electron-mode (TEM) turbulence is presented. The study is based on the Weiland fluid model for ion-temperature-gradient (ITG) modes and TEMs, complemented and compared with a trapped electron fluid treatment which retains contributions from the weakly trapped electrons. The dependence of the fluid transport coefficients on magnetic shear and other plasma parameters is discussed and compared with results obtained from nonlinear gyrokinetic simulations. Inward (pinch) flows of particles and heat, previously reported for the coupled ITG–TEM system, are also found in the TEM dominated regime.

Sign in / Sign up

Export Citation Format

Share Document