A spectral model for interchange transport in tokamak scrape-off layers

M. Peret (1) , N. Fedorczak , P. Tamain , Ph Ghendrih , Ph. Ghendrih , L. Vermare (2)

1 IRFM - Institut de Recherche sur la Fusion par confinement Magnétique
2 LPP - Laboratoire de Physique des Plasmas

Transport across flux surfaces in tokamak scrape-off layers is assumed to be carried by the convection of intermittent filaments (blobs) drifting outward due to interchange mechanisms. This intermittency keeps one away from analytically draw a transport model. A balance between parallel transport to the sheath and transverse transport approached here in a spectral point of view. This Spectral Filament model decomposes the transport in a sum of contributions from poloidal waves described by the 2D isothermal Braginskii's equations. Turbulent behavior predictions from the model founds a very good agreement against 2D simulations and a comparison with (1) parametric dependencies from experimental scaling laws and (2) an experimental dataset from Tore Supra for SOL parameters are also well recovered. A scaling of energy confinement time is finally drawn from this flux model.

Mots clés: Scrape-off layer width; turbulent transport; spectral model; ITER predictions

Domaines: Physique [physics]

M. Peret, N. Fedorczak, P. Tamain, Ph Ghendrih, Ph. Ghendrih, et al.. A spectral model for interchange transport in tokamak scrape-off layers. Nuclear Fusion, 2021, 61 (4), pp.046045. ⟨10.1088/1741-4326/abe6b3⟩. ⟨hal-03440223⟩