Radiative divertor plasmas with convection in DIII-D
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-; ISSN 1070-664X; TRN: 98:006122
- Journal Information:
- Physics of Plasmas, Vol. 5, Issue 5; Conference: 39. annual meeting of the Division of Plasma Physics of the American Physical Society, Pittsburgh, PA (United States), 17-21 Nov 1997; Other Information: PBD: May 1998
- Country of Publication:
- United States
- Language:
- English
Similar Records
Simulations of divertor plasmas with inverse sheaths
Modeling of particle and energy transport in the edge plasma of Alcator C-Mod