Structure of the edge density pedestal in tokamaks

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Title: Structure of the edge density pedestal in tokamaks
Author: Stacey, Weston M.
Abstract: A 'first-principles' model for the structure of the edge density pedestal in tokamaks between or in the absence of edge localized magnetohyrodynamic instabilities is derived from ion momentum and particle conservation and from the transport theory of recycling neutral atoms. A calculation for (high) H-mode tokamak discharge parameters indicates that the equations have a self-consistent solution which has an edge pedestal in the ion density profile and sharp negative spikes in the poloidal velocity and radial electric field profiles in the edge pedestal, features characteristic of H-mode edge profiles. These sharp negative spikes in radial electric field and poloidal rotation produce a peak in the inward ion pinch velocity in the sharp gradient (pedestal) region which produces an edge particle transport barrier. The calculated magnitude of the density at the top of the pedestal and the density gradient scale length and radial electric field in the pedestal region are comparable to measured values.
Description: Reprinted by permission of American Institute of Physics,
Type: Post-print
Citation: Physics of plasmas, Vol. 11, no. 9 (September 2004) p. 4295-4304
Date: 2004-09
Publisher: Georgia Institute of Technology
American Institute of Physics
Subject: Edge density
Edge pedestal transport barrier
Ion density profile
Sharp negative spikes in radial electric field
Transport theory of recycling neutral atoms

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