Scrape-Off Layer Transport and Deposition Studies in DIII-D

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Trace {sup 13}CH{sub 4} injection experiments into the main scrape-off layer of low density L-mode and high-density H-mode plasmas have been performed in the DIII-D tokamak [Luxon{_}NF02] to mimic the transport and deposition of carbon arising from a main chamber sputtering source. These experiments indicated entrainment of the injected carbon in plasma flow in the main SOL, and transport toward the inner divertor. Ex-situ surface analysis showed enhanced {sup 13}C surface concentration at the corner formed by the divertor floor and the angled target plate of the inner divertor in L-mode; in H-mode, both at the corner and along the ... continued below

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PDF-file: 51 pages; size: 2.8 Mbytes

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Groth, M; Allen, S; Boedo, J; Brooks, N; Elder, J; Fenstermacher, M et al. October 27, 2006.

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Trace {sup 13}CH{sub 4} injection experiments into the main scrape-off layer of low density L-mode and high-density H-mode plasmas have been performed in the DIII-D tokamak [Luxon{_}NF02] to mimic the transport and deposition of carbon arising from a main chamber sputtering source. These experiments indicated entrainment of the injected carbon in plasma flow in the main SOL, and transport toward the inner divertor. Ex-situ surface analysis showed enhanced {sup 13}C surface concentration at the corner formed by the divertor floor and the angled target plate of the inner divertor in L-mode; in H-mode, both at the corner and along the surface bounding the private flux region inboard of the outer strike point. Interpretative modeling was made consistent with these experimental results by imposing a parallel carbon ion flow in the main SOL toward the inner target, and a radial pinch toward the separatrix. Predictive modeling carried out to better understand the underlying plasma transport processes suggests that the deuterium flow in the main SOL is related to the degree of detachment of the inner divertor leg. These simulations show that carbon ions are entrained with the deuteron flow in the main SOL via frictional coupling, but higher charge state carbon ions may be suspended upstream of the inner divertor X-point region due to balance of the friction force and the ion temperature gradient.

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PDF-file: 51 pages; size: 2.8 Mbytes

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  • Presented at: 48th Annual APS DPP, Philadelphia, PA, United States, Oct 30 - Nov 03, 2006

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  • Report No.: UCRL-CONF-225694
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 914619
  • Archival Resource Key: ark:/67531/metadc889614

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Office of Scientific & Technical Information Technical Reports

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  • October 27, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • Dec. 8, 2016, 10:04 p.m.

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Groth, M; Allen, S; Boedo, J; Brooks, N; Elder, J; Fenstermacher, M et al. Scrape-Off Layer Transport and Deposition Studies in DIII-D, article, October 27, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc889614/: accessed October 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.