Experimental and Numerical Studies of Separatrix Splitting and Magnetic Footprints in DIII-D

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A numerical field line integration code is used to study the structure of divertor footprints produced by small non-axisymmetric magnetic perturbation in the DIII-D tokamak. The numerical modeling results are compared to experimental infrared camera data which show a splitting of the divertor target plate heat flux into several distinct peaks when an n=3 magnetic perturbation from the DIII-D I-coil is applied. The heat flux splitting consistently appears when the n=3 perturbation is applied and disappears when the perturbation is removed. The magnitude of the splitting implied by the numerical modeling is a factor of 3 smaller than the splitting ... continued below

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Evans, T; Joseph, I; Moyer, R; Fenstermacher, M; Lasnier, C & Yan, L May 15, 2006.

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A numerical field line integration code is used to study the structure of divertor footprints produced by small non-axisymmetric magnetic perturbation in the DIII-D tokamak. The numerical modeling results are compared to experimental infrared camera data which show a splitting of the divertor target plate heat flux into several distinct peaks when an n=3 magnetic perturbation from the DIII-D I-coil is applied. The heat flux splitting consistently appears when the n=3 perturbation is applied and disappears when the perturbation is removed. The magnitude of the splitting implied by the numerical modeling is a factor of 3 smaller than the splitting seen in the experimental data. These results suggest that the plasma response to the edge resonant applied n=3 magnetic perturbation produces an amplification of the vacuum magnetic footprint structure on the divertor target plates. These results may have significant implications for the ITER divertor design.

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PDF-file: 16 pages; size: 0.9 Mbytes

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  • Journal Name: Journal of Nuclear Materials, vol. 363-365, n/a, June 15, 2007, pp. 570-574; Journal Volume: 363-365

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  • Report No.: UCRL-JRNL-221430
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 940150
  • Archival Resource Key: ark:/67531/metadc898578

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  • May 15, 2006

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  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 28, 2016, 1:57 p.m.

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Evans, T; Joseph, I; Moyer, R; Fenstermacher, M; Lasnier, C & Yan, L. Experimental and Numerical Studies of Separatrix Splitting and Magnetic Footprints in DIII-D, article, May 15, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc898578/: accessed September 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.