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(TH/2-3) Anomalous Diffusion in Plasma Turbulence Models

B.A. Carreras1), V.E. Lynch1), L. Garcia2), G.M. Zaslavsky3)
1) Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA
2) Universidad Carlos III, Madrid, Spain
3) Courant Institute of Mathematical Sciences, New York University, New York, New York, USA

Abstract.  To explore the character of the underlying transport in plasma turbulence, we have followed the motion of tracer particles during the nonlinear evolution of 3-D turbulence models. Both the time evolution of the moments of the distribution function of the tracer particle radial positions and the finite-size Lyapunov number are use to determine the anomalous diffusion exponent. The numerical results for three different plasma turbulence models show that the transport mechanism is superdiffusive with an anomalous diffusion exponent in the range (0.85, 0.92).

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IAEA 2003