Application of a particle, momentum and energy balance model to calculate the structure of the edge pedestal in DIII-D

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Title: Application of a particle, momentum and energy balance model to calculate the structure of the edge pedestal in DIII-D
Author: Stacey, Weston M. ; Groebner, Richard J.
Abstract: A calculation of edge density and temperature profiles based on "classical" physics - particle, momentum and energy balance, heat conduction closure relations, neutral particle transport - yielded a pedestal structure that is qualitatively and quantitatively similar to that found experimentally in five DIII-D [J. Luxon, Nucl. Fusion,42, 614 (2002)] discharges, when experimental radial electric field and rotation profiles and experimentally inferred heat transport coefficients were used. The principal cause of the density pedestal was a peaking of the inward pinch velocity just inside the separatrix caused by the negative well in the experimental electric field, and the secondary cause was a peaking of the radial particle flux caused by the ionization of incoming neutrals. There is some evidence that this peaking of the radial particle flux just inside the separatrix may also be responsible in part for the negative electric field in that location.
Description: Reprinted by permission of American Institute of Physics, http://journals.aip.org
Type: Post-print
URI: http://hdl.handle.net/1853/9261
Citation: Physics of Plasmas Vol. 12, no. 4 (April 2005) (12 pages)
Date: 2005-04
Publisher: Georgia Institute of Technology
American Institute of Physics
Subject: Heat conduction
Ionization
Plasma density
Plasma edges
Plasma temperature
Plasma toroidal confinement
Plasma transport processes
Plasma-beam interactions
Tokamaks

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