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Changes in Particle Pumping Due to Variation in Magnetic Balance Near Double-Null in DIII-D

Description: OAK-B135 The authors report on a recent experiment examining how changes in the divertor magnetic balance affect the rate that particles can be pumped at the divertor targets. They find that both the edge density of the core plasma and divertor recycling play important roles in properly interpreting this pumping result. Previous studies on DIII-D have identified several important differences between double-null (DN) and single-null (SN) divertor operation. Small variations in the magnetic balan… more
Date: July 1, 2003
Creator: Petrie, T. W.; Watkins, J. G.; Allen, S. L.; Brooks, N. H.; Fenstermacher, M. E.; Ferron, J. R. et al.
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Partner: UNT Libraries Government Documents Department
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Transport of Elm Energy and Particles Into the Sol and Divertor of Diii-D

Description: We report on DIII-D data that reveal the underlying processes responsible for transport of energy and particles from the edge pedestal to the divertor target during edge-localized modes (ELMs). The separate convective and conductive transport of energy due to an ELM is determined by Thomson scattering measurements of electron density and temperature in the pedestal. Conductive transport is measured as a drop in pedestal temperature and decreases with increasing density. The convective transport… more
Date: June 1, 2002
Creator: Leonard, A. W.; Boedo, J. A.; Fenstermacher, M. E.; Groebner, R. J.; Groth, M.; Lasnier, C. J. et al.
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Partner: UNT Libraries Government Documents Department
open access

Far SOL Transport and Main Wall Plasma Interaction in DIII-D

Description: Far scrape-off layer (SOL) and near-wall plasma parameters in DIII-D depend strongly on the discharge parameters and confinement regime. In L-mode discharges cross-field transport increases with the average discharge density and flattens far SOL profiles, thus increasing plasma-wall contact. In H-mode between edge localized modes (ELMs), plasma-wall contact is generally weaker than in L-mode. During ELMs plasma fluxes to the wall increase to, or above the L-mode levels. Depending on the dischar… more
Date: October 19, 2004
Creator: Rudakov, D. L.; Boedo, J. A.; Moyer, R. A.; Stangeby, P. C.; Watkins, J. G.; Whyte, D. G. et al.
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Partner: UNT Libraries Government Documents Department
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