title: Multiscaling dynamics of impurity transport in drift-wave turbulence.
abstract: Intermittency effects and the associated multiscaling spectrum of exponents are investigated for impurities advection in tokamak edge plasmas. The two-dimensional Hasagawa-Wakatani model of resistive drift-wave turbulence is used as a paradigm to describe edge tokamak turbulence. Impurities are considered as a passive scalar advected by the plasma turbulent flow. The use of the extended self-similarity technique shows that the structure function relative scaling exponent of impurity density and vorticity follows the She-Leveque model. This confirms the intermittent character of the impurities advection in the turbulent plasma flow and suggests that impurities are advected by vorticity filaments.
authors.affiliation: France-Japan Magnetic Fusion Laboratory, LIA 336 CNRS/UMR 6633, CNRS-Université de Provence, Case 321, 13397 Marseille Cedex 20, France.
authors.forename: S
authors.initials: S
authors.lastname: Futatani
authors.forename: S
authors.initials: S
authors.lastname: Benkadda
authors.forename: Y
authors.initials: Y
authors.lastname: Nakamura
authors.forename: K
authors.initials: K
authors.lastname: Kondo