Radiative divertor plasmas with convection in DIII-D

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The radiation of divertor heat flux on DIII-D 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% 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 ... continued below

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34 p.

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Leornard, A. W.; Porter, G. D. & Wood, R. D. January 1998.

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The radiation of divertor heat flux on DIII-D 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% 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 has reproduced many of the observed experimental features.

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34 p.

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INIS; OSTI as DE98004686

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  • 39. annual meeting of the Division of Plasma Physics of the American Physical Society, Pittsburgh, PA (United States), 17-21 Nov 1997

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  • Other: DE98004686
  • Report No.: GA--A22787
  • Report No.: CONF-971103--
  • Grant Number: AC03-89ER51114;W-7405-ENG-48;AC05-96OR22464;AC04-94AL85000;FG03-95ER54294
  • Office of Scientific & Technical Information Report Number: 672005
  • Archival Resource Key: ark:/67531/metadc712115

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  • January 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • Jan. 11, 2018, 1:53 p.m.

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Leornard, A. W.; Porter, G. D. & Wood, R. D. Radiative divertor plasmas with convection in DIII-D, article, January 1998; San Diego, California. (digital.library.unt.edu/ark:/67531/metadc712115/: accessed November 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.