Gyrokinetic modelling of stationary electron and impurity profiles in tokamaks
Journal article, 2014

Particle transport due to Ion Temperature Gradient (ITG)/Trapped Electron Mode (TEM) turbulence is investigated using the gyrokinetic code GENE. Both a reduced quasilinear treatment and nonlinear simulations are performed for typical tokamak parameters corresponding to ITG dominated turbulence. The gyrokinetic results are compared and contrasted with results from a computationally efficient fluid model. A selfconsistent treatment is used, where the stationary local profiles are calculated corresponding to zero particle flux simultaneously for electrons and trace impurities. The scaling of the stationary profiles with magnetic shear, safety factor, electron-to-ion temperature ratio, collisionality, toroidal sheared rotation, plasma β, triangularity, and elongation is investigated. In addition, the effect of different main ion mass on the zero flux condition is discussed. The electron density gradient can significantly affect the stationary impurity profile scaling. It is therefore expected that a selfconsistent treatment will yield results more comparable to experimental results for parameter scans where the stationary background density profile is sensitive. This is shown to be the case in scans over magnetic shear, collisionality, elongation, and temperature ratio, for which the simultaneous zero flux electron and impurity profiles are calculated. A slight asymmetry between hydrogen, deuterium, and tritium with respect to profile peaking is obtained, in particular, for scans in collisionality and temperature ratio.

tokamak

ITER

fusion

plasma

ITG

turbulence

transport

TEM

Author

Andreas Skyman

Chalmers, Earth and Space Sciences, Plasma Physics and Fusion Energy

Daniel Tegnered

Chalmers, Earth and Space Sciences, Plasma Physics and Fusion Energy

Hans Nordman

Chalmers, Earth and Space Sciences, Plasma Physics and Fusion Energy

Pär Strand

Chalmers, Earth and Space Sciences, Plasma Physics and Fusion Energy

Physics of Plasmas

1070-664X (ISSN) 1089-7674 (eISSN)

Vol. 21 9 092305- 092305

Driving Forces

Sustainable development

Areas of Advance

Transport

Energy

Subject Categories

Other Engineering and Technologies

Other Physics Topics

Fusion, Plasma and Space Physics

Roots

Basic sciences

DOI

10.1063/1.4894739

More information

Created

10/7/2017