Author/Authors :
Rudakov، نويسنده , , D.L. and Boedo، نويسنده , , J.A. and Moyer، نويسنده , , R.A. and Brooks، نويسنده , , N.H. and Doerner، نويسنده , , R.P. and Evans، نويسنده , , T.E. and Fenstermacher، نويسنده , , M.E. and Groth، نويسنده , , M. and Hollmann، نويسنده , , E.M. and Krasheninnikov، نويسنده , , S. and Lasnier، نويسنده , , C.J. and Mahdavi، نويسنده , , M.A. and McKee، نويسنده , , G.R. and McLean، نويسنده , , A. and Stangeb، نويسنده ,
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 :
Intermittent transport , probes , Cross-field transport , Edge plasma , DIII-D
