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

Groth, M; Allen, S; Boedo, J; Brooks, N; Elder, J; Fenstermacher, M; Groebner, R; Lasnier, C; McLean, A; Leonard, A; Lisgo, S; Porter, G; Rensink, M; Rognlien, T; Rudakov, D; Stangeby, P; Wampler, W; Watkins, J

doi:10.1063/1.2721978

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

Conference · Fri Oct 27 04:00:00 EDT 2006

DOI:https://doi.org/10.1063/1.2721978· OSTI ID:914619

Groth, M; Allen, S; Boedo, J; Brooks, N; Elder, J; Fenstermacher, M; Groebner, R; Lasnier, C; McLean, A; Leonard, A; Lisgo, S; Porter, G; Rensink, M; Rognlien, T; Rudakov, D; Stangeby, P; Wampler, W; Watkins, J

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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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA

Sponsoring Organization:: USDOE

DOE Contract Number:: W-7405-ENG-48

OSTI ID:: 914619

Report Number(s):: UCRL-CONF-225694

Country of Publication:: United States

Language:: English

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