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Author(s):
S.-I. Itoh
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Title:
A Model of Peaked Density Profile and Inward Pinch in Tokamaks
Date of publication:
Feb. 1990
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Key words:
anomalous pinch, peaked density profile, improved confinement, tokamak transport, ion viscosity, radial electric field
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Abstract:
A model theory of peaked density profile and inward flux of ohmic discharges in tokamak is presented. Anomalous particle fluxes in the presence of radial electric field, E_r, and radial current are consistently solved in stationary state. Viscous damping of differential flow due to E_r balances with particle diffusion, which determines density and E_r structures. In viscous plasma, peaked profile is expected. Reduction of edge neutrals induces further inward flux; Change of E_r with ion viscous damping propagates into center, causing the ion heating as well.
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