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 fi...

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Bibliographic Details
Published in:Journal of nuclear materials 2005-03, Vol.337-339, p.717-721
Main Authors: Rudakov, D.L., Boedo, J.A., Moyer, R.A., Brooks, N.H., Doerner, R.P., Evans, T.E., Fenstermacher, M.E., Groth, M., Hollmann, E.M., Krasheninnikov, S., Lasnier, C.J., Mahdavi, M.A., McKee, G.R., McLean, A., Stangeby, P.C., Wampler, W.R., Watkins, J.G., West, W.P., Whyte, D.G., Wong, C.P.C.
Format: Article
Language:English
Subjects:
Cross-field transport
DIII-D
Edge plasma
Intermittent transport
Probes
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Summary: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.
ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2004.10.094