Speaker
Julien Médina
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P4.1087.pdf
Test particles dynamics, quasi-linear and nonlinear transport in
low-frequency tokamak turbulence
J. Médina, M. Lesur, E. Gravier, T. Reveille, M. Idouakass, P. Bertrand, T. Drouot
Université de Lorraine, CNRS, IJL, F-54000 Nancy, France
In the context of magnetic confinement fusion, we compare the quasi-linear particle and heat
fluxes obtained from an analytical expression, to the nonlinear fluxes obtained with a gyroki-
netic code. We then study the transport and the diffusion in toroidal turbulent plasma simulations
using statistics on a relevant number of test particles.
TERESA is a gyrokinetic code based on the bounce-averaged Vlasov-Poisson model[1], which
reduces drastically the numerical computation costs by averaging out the cyclotron and banana
bounce motions of trapped particles.
TERESA[2, 3] (Trapped Element REduction in Semi lagrangian Approach) is therefore relevant
to study phenomena at the order of the trapped particle precession timescale. Such phenomena
include macroscopic anomalous transport driven by the plasma turbulence, which degrades the
confinement of the fusion plasma.
We find that the quasi-linear fluxes predictions are accurate for a certain range of parameters and
radii. Furthermore test particles diffusion is in qualitative agreement with quasi-linear theory.
References
[1] G. Depret, X. Garbet, P. Bertrand, A. Ghizzo, Plasma Phys. Cont. Fusion 42, 949 (2000)
[2] T. Cartier-Michaud, P. Ghendrih, V. Grandgirard, and G. Latu, ESAIM: PROC 43, 274 (2013)
[3] T. Drouot, E. Gravier, T. Reveille, A. Ghizzo, P. Bertrand, X. Garbet, Y. Sarazin, T. Cartier-Michaud, Eur.
Phys. J. D 68, 280 (2014)
