Transport and Deposition of 13c From Methane Injection into Detached H-Mode Plasmas in DIII-D

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Experiments are described which examine the transport and deposition of carbon entering the main plasma scrape-off layer in DIII-D. {sup 13}CH{sub 4} was injected from a toroidally symmetric source into the crown of lower single-null detached ELMy H-mode plasmas. {sup 13}C deposition, mapped by nuclear reaction analysis of tiles, was high at the inner divertor but absent at the outer divertor, as found previously for low density L-mode plasmas. This asymmetry indicates that ionized carbon is swept towards the inner divertor by a fast flow in the scrape-off layer. In the private flux region between inner and outer strike points, ... continued below

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PDF-file: 17 pages; size: 0.4 Mbytes

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Wampler, W R; McLean, A G; Allen, S L; Brooks, N H; Elder, J D; Fenstermacher, M E et al. June 1, 2006.

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Experiments are described which examine the transport and deposition of carbon entering the main plasma scrape-off layer in DIII-D. {sup 13}CH{sub 4} was injected from a toroidally symmetric source into the crown of lower single-null detached ELMy H-mode plasmas. {sup 13}C deposition, mapped by nuclear reaction analysis of tiles, was high at the inner divertor but absent at the outer divertor, as found previously for low density L-mode plasmas. This asymmetry indicates that ionized carbon is swept towards the inner divertor by a fast flow in the scrape-off layer. In the private flux region between inner and outer strike points, carbon deposition was low for L-mode but high for the H-mode plasmas. OEDGE modeling reproduces observed deposition patterns and indicates that neutral carbon dominates deposition in the divertor from detached H-mode plasmas.

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PDF-file: 17 pages; size: 0.4 Mbytes

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  • Journal Name: Journal of Nuclear Materials, vol. 363-365, N/A, June 15, 2007, pp. 72-77; Journal Volume: 363-365

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  • Report No.: UCRL-JRNL-221816
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 936661
  • Archival Resource Key: ark:/67531/metadc899893

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  • June 1, 2006

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  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 9, 2016, 7:28 p.m.

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Wampler, W R; McLean, A G; Allen, S L; Brooks, N H; Elder, J D; Fenstermacher, M E et al. Transport and Deposition of 13c From Methane Injection into Detached H-Mode Plasmas in DIII-D, article, June 1, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc899893/: accessed August 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.