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Far Scarpe-Off Layer and Near Wall Plasma Studies in DIII-D.

DE200515011795

Publication Date	2004
Personal Author	Rudakov, D. L.; Boedo, J. A.; Moyer, R. A.; Brooks, N. H.; Doerner, R. P.; Evans, T. E.; Fenstermacher, M. E.
Page Count	22
Abstract	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.
Keywords	Plasma control Doublet-3 devices Tokamak devices Edge localized modes ELectric currents Plasma density Sputtering Amplitudes Transport Plasma scrape-off layer
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Lawrence Livermore National Lab., CA.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200602

Far Scarpe-Off Layer and Near Wall Plasma Studies in DIII-D.

Far Scarpe-Off Layer and Near Wall Plasma Studies in DIII-D.
DE200515011795

Publication Date	2004
Personal Author	Rudakov, D. L.; Boedo, J. A.; Moyer, R. A.; Brooks, N. H.; Doerner, R. P.; Evans, T. E.; Fenstermacher, M. E.
Page Count	22
Abstract	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.
Keywords	Plasma control Doublet-3 devices Tokamak devices Edge localized modes ELectric currents Plasma density Sputtering Amplitudes Transport Plasma scrape-off layer
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Lawrence Livermore National Lab., CA.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200602