Non-Fickian particle diffusion in confined plasmas and the transition from diffusive transport to density waves propagation

Vázquez, Federico; Márkus, Ferenc
April 2010
Physics of Plasmas;Apr2010, Vol. 17 Issue 4, p042111
Academic Journal
Transport and dissipation phenomena determine the quality of confinement in fusion plasmas devices. Turbulence, fluctuations, and instabilities are mechanisms which make them very complex dynamical processes. Two fluctuating regimes have been identified, which are related with the diffusive and wave propagation of mass in the system. The presence of one or another of these regimes in the plasma dynamics depends on several parameters as size of the container, inhomogeneities, etc. In this paper, we investigate the effects of inhomogeneous diffusion on the mass transport regime in hot plasmas. Small spatial gradients of the diffusion coefficient change the transport from diffusive to mass density waves propagation.


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