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

Rudakov, D. L. ; Boedo, J. A. ; Moyer, R. A. ; Brooks, N. H. ; Doerner, R. P. ; Evans, T. E. ; Fenstermacher, M. E.

Technical Information Center Oak Ridge Tennessee

关键词: Plasma control;    Doublet-3 devices;    Tokamak devices;    Edge localized modes;    ELectric currents;   

RP-ID  :  DE200515011795

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

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.