title: Experimental electron temperature gradient dependence of heavy impurity transport in fusion devices.
abstract: The turbulent impurity (nickel) transport dependence on the normalized electron temperature gradient has been analyzed in sawtooth-free electron cyclotron wave heated Tore Supra plasmas. In the core, our experimental analysis shows that the lower R/L((T)(e)), the lower the nickel diffusion coefficient. The latter decreases until the instability threshold is reached. The experimental threshold is in agreement with the one computed by a gyrokinetic model. Further out, R/L((T)(e)) plays no role in the impurity diffusion. This set of experimental results is consistent with a quasilinear gyrokinetic analysis.
authors.affiliation: CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France.
authors.forename: D
authors.initials: D
authors.lastname: Villegas
authors.forename: R
authors.initials: R
authors.lastname: Guirlet
authors.forename: C
authors.initials: C
authors.lastname: Bourdelle
authors.forename: G T
authors.initials: GT
authors.lastname: Hoang
authors.forename: X
authors.initials: X
authors.lastname: Garbet
authors.forename: R
authors.initials: R
authors.lastname: Sabot