We address the question of establishing if, and under what physical and boundary conditions, the neoclassical transport is quantitatively capable of establishing high gradients in a narrow layer at the edge of an auxiliary heated tokamak plasma, and of driving poloidal rotation in the absence of external momentum input and vanishing parallel viscous stress, in a time scale of a few milliseconds. We observe that a torque for poloidal and toroidal acceleration with constant parallel flow is provided by the displacement current at third order of the adiabatic expansion. Combining neoclassical transport with a model of anomalous transport suppression we show the development, during a few milliseconds, of strong gradients in temperature, radial electric field and poloidal rotation at the edge, that are consistent in magnitude nd sign with observations.
Neoclassical Transport and Poloidal Rotation at the L-H Transition
G Gervasini;E Lazzaro;
1995
Abstract
We address the question of establishing if, and under what physical and boundary conditions, the neoclassical transport is quantitatively capable of establishing high gradients in a narrow layer at the edge of an auxiliary heated tokamak plasma, and of driving poloidal rotation in the absence of external momentum input and vanishing parallel viscous stress, in a time scale of a few milliseconds. We observe that a torque for poloidal and toroidal acceleration with constant parallel flow is provided by the displacement current at third order of the adiabatic expansion. Combining neoclassical transport with a model of anomalous transport suppression we show the development, during a few milliseconds, of strong gradients in temperature, radial electric field and poloidal rotation at the edge, that are consistent in magnitude nd sign with observations.File | Dimensione | Formato | |
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