Plasma Turbulence in Magnetic Confinement Systems

Benjamin Carreras
Oak Ridge National Laboratory

Plasma turbulence has some of the characteristic properties of neutral fluid turbulence. Multiple time and space scales are involved and the fluctuation spectra are broad. However, there are significant differences between these two forms of turbulence. In plasmas, the source of free energy is distributed over a broad range of scales because multiple instabilities coexist. Therefore, the existence of an inertial range is questionable. In addition, the underlying magnetic structure constrains the location of eddies and their motion is not as random as in the case of fluid turbulence. We will review some of these basic properties of the plasma turbulence and their impact on transport. On the basis of fluids models of plasma turbulence, calculations of tracer particle transport will be presented and the superdiffusive nature of the transport will be discussed.


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