Far Scrape-Off Layer and Near Wall Plasma Studies in DIII-D
Far scrape-off layer (SOL) plasma parameters in DIII-D depend strongly on the discharge density and confinement regime. In L-mode, cross-field transport increases with the average discharge density and elevates the far SOL density, thus increasing plasma-wall contact. Far SOL density near the low field side (LFS) of the main chamber wall also increases with decreasing plasma current and with decreasing outer wall gap. In H-mode, between edge localized modes (ELMs), plasma-wall contact is weaker than in L-mode. During ELMs plasma fluxes to the LFS wall increase to, or above the L-mode levels. A large fraction of the net cross-field fluxes is convected through the SOL by large amplitude intermittent transport events. In high density L-mode and during ELMs in H-mode, intermittent events propagate all the way to the LFS wall and may cause sputtering.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 15011795
- Report Number(s):
- UCRL-CONF-208424; TRN: US0501445
- Resource Relation:
- Journal Volume: 337-339; Conference: Presented at: 16th International Conference on Plasma Surface Interactions, Portland, ME (US), 05/24/2004--05/28/2004; Other Information: PBD: 3 Dec 2004
- Country of Publication:
- United States
- Language:
- English
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