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Multiscaling dynamics of impurity transport in drift-wave turbulence
S Futatani1, S Benkadda, Y Nakamura
1France-Japan Magnetic Fusion Laboratory, LIA 336 CNRS/UMR 6633, CNRS-Université de Provence, Case 321, 13397 Marseille Cedex 20, France.
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.
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