Effect of Magnetic Geometry on ELM Heat Flux Profiles

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In this paper we explore how precisely the magnetic up/down symmetry must be controlled to insure sharing of edge localized mode (ELM) heat flux between upper and lower diverters in a double-null tokamak. We show for DIII-D, using infrared thermography, that the spatial distribution of Type-I ELM energy is less strongly affected by variations in magnetic geometry than is the time-averaged peak heat flux in attached discharges. The degree of control necessary to share ELM heat flux deposition equally between diverters was less stringent than the control needed to balance the time averaged heat flux. ELM energy is transported more ... continued below

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396 Kilobytes pages

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Lasnier, C.J.; Leonard, A.W.; Petrie, T.W. & Watkins, J.G. May 15, 2000.

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In this paper we explore how precisely the magnetic up/down symmetry must be controlled to insure sharing of edge localized mode (ELM) heat flux between upper and lower diverters in a double-null tokamak. We show for DIII-D, using infrared thermography, that the spatial distribution of Type-I ELM energy is less strongly affected by variations in magnetic geometry than is the time-averaged peak heat flux in attached discharges. The degree of control necessary to share ELM heat flux deposition equally between diverters was less stringent than the control needed to balance the time averaged heat flux. ELM energy is transported more than four times further into the scrape-off layer than the time-averaged heat flux.

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396 Kilobytes pages

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  • 14th International Plasma Surface Interactions Conference, Rosenheim (DE), 05/22/2000--05/26/2000

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  • Report No.: UCRL-JC-139170
  • Grant Number: W-7405-Eng-48
  • Office of Scientific & Technical Information Report Number: 791721
  • Archival Resource Key: ark:/67531/metadc733900

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  • May 15, 2000

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  • Oct. 19, 2015, 7:39 p.m.

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  • May 6, 2016, 1:14 p.m.

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Lasnier, C.J.; Leonard, A.W.; Petrie, T.W. & Watkins, J.G. Effect of Magnetic Geometry on ELM Heat Flux Profiles, article, May 15, 2000; California. (digital.library.unt.edu/ark:/67531/metadc733900/: accessed October 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.