Implications of Wall Recycling and Carbon Source Locations on Core Plasma Fueling and Impurity Content in DIII-D

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Measurement and modeling of the 2-D poloidal D{alpha} intensity distribution in DIII-D low and medium density L-mode and ELMy H-mode plasmas indicate that hydrogen neutrals predominantly fuel the core from the divertor X-point region. The 2-D distribution of neutral deuterium and low-charge-state carbon were measured in the divertor and the high-field side midplane scrape-off layer (SOL) using tangentially viewing cameras. The emission in the high-field SOL at the equatorial plane was found to be three to four orders of magnitude lower than at the strike points in the divertor, suggesting a strong divertor particle source. Modeling using the UEDGE/DEGAS codes ... continued below

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Groth, M; Porter, G D; Boedo, J A; Brooks, N H; Fenstermacher, M E; Groebner, R J et al. October 14, 2004.

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Measurement and modeling of the 2-D poloidal D{alpha} intensity distribution in DIII-D low and medium density L-mode and ELMy H-mode plasmas indicate that hydrogen neutrals predominantly fuel the core from the divertor X-point region. The 2-D distribution of neutral deuterium and low-charge-state carbon were measured in the divertor and the high-field side midplane scrape-off layer (SOL) using tangentially viewing cameras. The emission in the high-field SOL at the equatorial plane was found to be three to four orders of magnitude lower than at the strike points in the divertor, suggesting a strong divertor particle source. Modeling using the UEDGE/DEGAS codes predicted the poloidal fueling distribution to be dependent on the direction of the ion Bx{Delta}B drift. In plasmas with the Bx{Delta}B drift into the divertor stronger fueling from the inner divertor than from the outer is predicted, due to a lower-temperature and higher-density plasma in the inner leg. UEDGE simulations with carbon produced by both physical and chemical sputtering at the divertor plates and walls only are in agreement with a large set of diagnostic data. The simulations indicate flow reversal in the inner divertor that augments the leakage of carbon ions from the divertor into the core.

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PDF-file: 11 pages; size: 0.6 Mbytes

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  • Presented at: 20th IAEA Fusion Energy Conference, Vilamoura, Portugal, Nov 01 - Nov 06, 2004

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  • Report No.: UCRL-CONF-207247
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 15014730
  • Archival Resource Key: ark:/67531/metadc1408324

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  • October 14, 2004

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  • Jan. 23, 2019, 12:54 p.m.

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  • Jan. 29, 2019, 11:21 a.m.

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Groth, M; Porter, G D; Boedo, J A; Brooks, N H; Fenstermacher, M E; Groebner, R J et al. Implications of Wall Recycling and Carbon Source Locations on Core Plasma Fueling and Impurity Content in DIII-D, article, October 14, 2004; Livermore, California. (https://digital.library.unt.edu/ark:/67531/metadc1408324/: accessed March 22, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.