Quasilinear nature of L mode edge turbulent transport in fluid nonlinear simulations

G de Dominici (1) , G. Fuhr (2) , C. Bourdelle (1) , P. Beyer (2) , X. Garbet (1) , Y. Sarazin (1) , G. Falchetto (1) , Contributors Jet

1 IRFM - Institut de Recherche sur la Fusion par confinement Magnétique
2 PIIM - Physique des interactions ioniques et moléculaires

In tokamak plasma, the edge region is characterized by larger gradients, higher resisitivity and distance to the critical β shorter compared to core plasma. By edge, here we mean the region where the pedestal forms when transsiting from L to H-mode: r/a = 0.85 − 1. This paper shows, using a three-dimensional electromagnetic fluid turbulent transport model, that the quasilinear hypothesis is valid in the edge region. The diamagnetic coupling is stabilizing while β is destabilizing. The effect of β on the characteristic times of turbulence is studied, as its effect on the Reynolds stress and the Maxwell stress in these fluid simulations.

Domaines: Physique [physics]

G de Dominici, G. Fuhr, C. Bourdelle, P. Beyer, X. Garbet, et al.. Quasilinear nature of L mode edge turbulent transport in fluid nonlinear simulations. Nuclear Fusion Journal of Plasma Physics and Thermonuclear Fusion, 2019. ⟨cea-02375494⟩