Far SOL Transport and Main Wall Plasma Interaction in DIII-D

Rudakov, D L; Boedo, J A; Moyer, R A; Stangeby, P C; Watkins, J G; Whyte, D G; Zeng, L; Brooks, N H; Doerner, R P; Evans, T E; Fenstermacher, M E; Groth, M; Hollmann, E M; Krasheninnikov, S I; Lasnier, C J; Leonard, A W; Mahdavi, M A; McKee, G R; McLean, A G; Pigarov, A Y; Wampler, W R; Wang, G; West, W P; Wong, C C

doi:10.1088/0029-5515/45/12/014

Far SOL Transport and Main Wall Plasma Interaction in DIII-D

Conference · Tue Oct 19 04:00:00 EDT 2004

DOI:https://doi.org/10.1088/0029-5515/45/12/014· OSTI ID:15014728

Rudakov, D L; Boedo, J A; Moyer, R A; Stangeby, P C; Watkins, J G; Whyte, D G; Zeng, L; Brooks, N H; Doerner, R P; Evans, T E; Fenstermacher, M E; Groth, M; Hollmann, E M; Krasheninnikov, S I; Lasnier, C J; Leonard, A W; Mahdavi, M A; McKee, G R; McLean, A G; Pigarov, A Y more »

Far scrape-off layer (SOL) and near-wall plasma parameters in DIII-D depend strongly on the discharge parameters and confinement regime. In L-mode discharges cross-field transport increases with the average discharge density and flattens far SOL profiles, thus increasing plasma-wall contact. In H-mode between edge localized modes (ELMs), plasma-wall contact is generally weaker than in L-mode. During ELMs plasma fluxes to the wall increase to, or above the L-mode levels. Depending on the discharge conditions ELMs are responsible for 30-90% of the ion flux to the outboard chamber wall. Cross-field fluxes in far SOL are dominated by large amplitude intermittent transport events that may propagate all the way to the outer wall and cause sputtering. A Divertor Material Evaluation System (DiMES) probe containing samples of several ITER-relevant materials including carbon, beryllium and tungsten was exposed to a series of upper single null (USN) discharges as a proxy to measure the first wall erosion.

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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:: 15014728

Report Number(s):: UCRL-CONF-207411

Country of Publication:: United States

Language:: English

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