TRANSPORT OF ELM ENERGY AND PARTICLES INTO THE SOL AND DIVERTOR OF DIII-D

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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 of energy, measured as a loss of density from the pedestal, however, remains constant as a function of density. From the SOL ELM energy is quickly carried ... continued below

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LEONARD, A.W.; BOEDO, J.A.; FENSTERMACHER, M.E.; GROEBNER, R.J.; GROTH, M.; LASNIER, C.J. et al. June 1, 2002.

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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 of energy, measured as a loss of density from the pedestal, however, remains constant as a function of density. From the SOL ELM energy is quickly carried to the divertor target. An expected sheath limit to the ELM heat flux set by the slower arrival of pedestal ions is overcome by additional ionization of neutrals generated from the divertor target as evidenced by a fast, {approx}100 {micro}s, rise in divertor density. A large in/out asymmetry of the divertor ELM heat flux is observed at high density, but becomes nearly symmetric at low density.

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Medium: X; Size: 19 pages

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Oakland Operations Office, Oakland, CA (US); INIS

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  • 15th International Conference on Plasma Surface Interactions in Controlled Fusion Devices, Gifu (JP), 05/27/2002--05/31/2002; Other Information: THIS IS A PREPRINT OF A PAPER PRESENTED AT THE 15TH INTERNATIONAL CONFERENCE ON PLASMA SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES, MAY 27-31, 2002, GIFU, JAPAN, AND TO BE PUBLISHED IN THE ''PROCEEDINGS''

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  • Report No.: NONE
  • Grant Number: AC03-99ER54463
  • Office of Scientific & Technical Information Report Number: 804693
  • Archival Resource Key: ark:/67531/metadc733729

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • June 1, 2002

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  • Oct. 18, 2015, 6:40 p.m.

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  • Jan. 4, 2017, 1:56 p.m.

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LEONARD, A.W.; BOEDO, J.A.; FENSTERMACHER, M.E.; GROEBNER, R.J.; GROTH, M.; LASNIER, C.J. et al. TRANSPORT OF ELM ENERGY AND PARTICLES INTO THE SOL AND DIVERTOR OF DIII-D, article, June 1, 2002; United States. (digital.library.unt.edu/ark:/67531/metadc733729/: accessed November 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.