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(THP2/15) Interpretation of Transport Barriers and of Subneoclassical Transport in the Framework of the Revisited Neoclassical Theory

   
A. L. Rogister 
 
Institut für Plasmaphysik, Forschungszentrum Jülich GmbH, EURATOM Association, Trilateral Euregio Cluster, D-52425 Jülich, Germany

Abstract
``Subneoclassical'' heat fluxes are predicted in the high collisionality  regime by the revisited neoclassical theory , which includes the roles of Finite Larmor Radius effects and Inertia, that we published earlier. Unlike conventional neoclassical theory, the revisited theory further provides a non degenerate ambipolarity constraint which defines unambiguously the radial electric field. Together with the parallel momentum equation, the ambipolarity constraint leads, under some conditions, to radial electric field profiles with high negative shear  akin to those observed in spontaneous edge transport barriers . The predictions of the theory are outlined, with emphasis laid on the interpretation of experimental results such as magnitude of the jumps, width of the shear layer, local scaling laws. Extension of the theory to triggered transitions and cold pulse propagation studies is suggested.

 

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