Author/Authors :
Petrie، نويسنده , , T.W. and Watkins، نويسنده , , J.G. and Baylor، نويسنده , , L.R. and Brooks، نويسنده , , N.H. and Fenstermacher، نويسنده , , M.E. and Hyatt، نويسنده , , A.W. and Jackson، نويسنده , , G.L. and Lasnier، نويسنده , , C.J. and Leonard، نويسنده , , A.W. and Pigarov، نويسنده , , A.Yu. and Rensink، نويسنده , , M.E. and Rognlien، نويسنده , , T.D. and Schaffer، نويسنده , , M.J. and Wolf، نويسنده , , N.S.، نويسنده ,
Abstract :
Changes in the divertor magnetic balance in DIII-D H-mode plasmas affects core, edge, and divertor plasma behavior. Both the pedestal density ne,PED and plasma stored energy WT were sensitive to changes in magnetic balance near the double-null (DN) configuration, e.g., both decreased 20–30% when the DN shifted to a slightly unbalanced DN, where the B×∇B drift direction pointed away from the main X-point. Recycling at each of the four divertor targets was sensitive to changes in magnetic balance and the B×∇B drift direction. The poloidal distribution of the recycling in DN is in qualitative agreement with the predictions of UEDGE modeling with particle drifts included. The particle flux at the inner divertor target is shown to be much more sensitive to magnetic balance than the particle flux at the outer divertor target near the DN shape. These results suggest possible advantages and drawbacks for balanced DN operation.
Keywords :
Magnetic balance , recycling , UEDGE , DIII-D , Double-null , Divertor
