Electronic Resource
[S.l.]
:
American Institute of Physics (AIP)
Physics of Plasmas
8 (2001), S. 5199-5203
ISSN:
1089-7674
Source:
AIP Digital Archive
Topics:
Physics
Notes:
A model for calculating edge gradients in density and temperature from transport and atomic physics considerations is combined with a model for calculating the enhancement of edge transport by thermal instabilities, the onset and strength of which in turn depend on edge gradients and atomic physics. A minimum threshold value of the nonradiative power flux passing through the edge that is required to suppress transport enhancing thermal instabilities is established. When the power flux through the edge is less than this minimum threshold value, the model predicts a deterioration of the edge gradients as the neutral concentration, the impurity concentration and/or the impurity radiation emissivity in the edge plasma increase, which is consistent with experimental observations. Model problem calculations are presented to illustrate the predicted pedestal deterioration for representative experimental conditions.© 2001 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1416879
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