L-H transition dynamics in fluid turbulence simulations with neoclassical force balance

Laurent Chôné (1, 2) , Peter Beyer (2) , Yanick Sarazin (1) , Guillaume Fuhr (2) , Clarisse Bourdelle (1) , Sadruddin Benkadda (2)

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

Spontaneous transport barrier generation at the edge of a magnetically confined plasma is investigated. To this end, a model of electrostatic turbulence in three-dimensional geometry is extended to account for the impact of friction between trapped and passing particles on the radial electric field. Non-linear flux-driven simulations are carried out, and it is shown that considering the radial and temporal variations of the neoclassical friction coefficients allows for a transport barrier to be generated above a threshold of the input power.

Mots clés: Plasmas; tokamak; L-H transition; fluid simulations

Domaines: Physique des plasmas [physics.plasm-ph]

Laurent Chôné, Peter Beyer, Yanick Sarazin, Guillaume Fuhr, Clarisse Bourdelle, et al.. L-H transition dynamics in fluid turbulence simulations with neoclassical force balance. 2013. ⟨hal-00908422⟩