Radiative divertor plasmas with convection in DIII-D

Journal Article · Fri May 01 04:00:00 EDT 1998 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.872842· OSTI ID:627770

Leonard, A W; Porter, G D; Wood, R D; Allen, S L; Boedo, J; Brooks, N H; Evans, T E; Fenstermacher, M E; Hill, D N; Isler, R C; Lasnier, C J; Lehmer, R D; Mahdavi, M A; Maingi, R; Moyer, R A; Petrie, T W; Schaffer, M J; Wade, M R; Watkins, J G; West, W P ; Whyte, D G ^[1]

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1. General Atomics, P.O. Box 85608, San Diego, California92186-5608 (United States)

The radiation of divertor heat flux on DIII-D [J. Luxon {ital et al.}, in {ital Proceedings of the 11th International Conference on Plasma Physics and Controlled Nuclear Fusion} (International Atomic Energy Agency, Vienna, 1987), p. 159] is shown to greatly exceed the limits imposed by assumptions of energy transport dominated by electron thermal conduction parallel to the magnetic field. Approximately 90{percent} of the power flowing into the divertor is dissipated through low-Z radiation and plasma recombination. The dissipation is made possible by an extended region of low electron temperature in the divertor. A one-dimensional analysis of the parallel heat flux finds that the electron temperature profile is incompatible with conduction-dominated parallel transport. Plasma flow at up to the ion acoustic speed, produced by upstream ionization, can account for the parallel heat flux. Modeling with the two-dimensional fluid code UEDGE [T. Rognlien, J. L. Milovich, M. E. Rensink, and G. D. Porter, J. Nucl. Mater. {bold 196{endash}198}, 347 (1992)] has reproduced many of the observed experimental features. {copyright} {ital 1998 American Institute of Physics.}

• OSTI ID: 627770
• Report Number(s): CONF-971103--
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 5; ISSN 1070-664X; ISSN PHPAEN
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CHARGED-PARTICLE TRANSPORT
CONVECTION
DIVERTORS
IONIZATION
PLASMA SIMULATION
TOKAMAK DEVICES