Far scrape-off layer and near wall plasma studies in DIII-D.
- General Atomics, San Diego, CA
- University of Toronto Institute for Aerospace Studies, Toronto, Canada
- Lawrence Livermore National Laborabory, Livermore, CA
- University of Wisconsin, Madison, WI
- University of California, San Diego, CA
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:
- Sandia National Laboratories
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 952797
- Report Number(s):
- SAND2004-2192C
- Country of Publication:
- United States
- Language:
- English
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