C transport studies in L-mode divertor plasmas on DIII-D.
- General Atomics, San Diego, CA
- Princeton Plasma Physics Laboratory, Princeton NJ
- University of Toronto Institute for Aerospace Studies, Toronto, Canada
- University of Wisconsin, Madison, WI
- University of California, San Diego, La Jolla, CA
- Lawrence Livermore National Laboratory, Livermore, CA
- Euratom/UKAEA Fusion Association, Culham Science Center, Abingdon, UK
- FZJ Julich GmbH/Euratom Institut fur Plasmaphysik, Julich, Germany
{sup 13}CH{sub 4} was injected with a toroidally-symmetric gas system into 22 identical lower-single-null L-mode discharges on DIII-D. The injection level was adjusted so that it did not significantly perturb the core or divertor plasmas, with a duration of {approx}3 s on each shot, for a total of {approx}300 T L of injected particles. The plasma shape remained very constant; the divertor strike points were controlled to {approx}1 cm at the divertor plate. At the beginning of the subsequent machine vent, 29 carbon tiles were removed for nuclear reaction analysis of {sup 13}C content to determine regions of carbon deposition. It was found that only the tiles inboard of the inner strike point had appreciable {sup 13}C above background. Visible spectroscopy measurements of the carbon injection and comparisons with modeling are consistent with carbon transport by means of scrape-off layer flow.
- Research Organization:
- Sandia National Laboratories
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 956868
- Report Number(s):
- SAND2004-2693C
- Country of Publication:
- United States
- Language:
- English
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