Investigation of transport in the DIII-D edge pedestal

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Title: Investigation of transport in the DIII-D edge pedestal
Author: Stacey, Weston M.
Abstract: A comparison of various heat conduction theories with data from several DIII-D [Luxon, Nucl. Fusion, 42, 614, 2002] shots indicates: 1) that neoclassical theory is in somewhat better agreement with experiment than is ion temperature gradient mode theory for the ion thermal conductivity in the edge pedestal, although both are in reasonable agreement with experiment for most discharges; and 2) that electron temperature gradient theory (k┴cs ≤ ωpe) is in much better agreement with experiment than is electron drift wave theory (k┴cs ≤ Ωi) for the electron thermal conductivity. New theoretical expressions derived from momentum balance are presented for: 1) a ‘diffusive-pinch’ particle flux, 2) an experimental determination of the momentum transfer frequency, and 3) the density gradient scale length. Neither atomic physics nor convection can account for the measured momentum transfer frequencies, but neoclassical gyroviscosity predictions are of the correct magnitude.
Description: Reprinted by permission of American Institute of Physics,
Type: Post-print
Citation: Physics of Plasmas, Vol. 11, no 4 (April 2004)p. 1511-1519
Date: 2004-04
Publisher: Georgia Institute of Technology
American Institute of Physics
Subject: Doublet-3 device (DIII-D)
Electron temperature
Heat conduction
Ion temperature
Momentum transfer
Neoclassical transport theory

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