Author/Authors :
Petrie، نويسنده , , T.W. and Brooks، نويسنده , , N.H. and Fenstermacher، نويسنده , , M.E. and Greenfield، نويسنده , , C.M. and Groth، نويسنده , , M. and Hyatt، نويسنده , , A.W. and Leonard، نويسنده , , A.W. and Mahdavi، نويسنده , , M.A. and Porter، نويسنده , , G.D. and Rensink، نويسنده , , M.E. and Schaffer، نويسنده , , M.J. and Wade، نويسنده , , M.R. and Watkins، نويسنده , , J.G. and Wolf، نويسنده , , N.S. and The DIII، نويسنده ,
Abstract :
Recent experiments on DIII-D point to the importance of two factors in determining the rate at which deuterium particles can be pumped at the divertor target(s): (1) the divertor magnetic balance, i.e., the degree to which the divertor topology is single-null (SN) or double-null (DN), and (2) the direction of the of B × ∇B ion drift with respect to the X-point(s). Changes in divertor magnetic balance near the DN shape have a much stronger effect on the pumping rate at the inner divertor target(s) than on the pumping rate at the outer divertor target(s). The behavior in the particle pumping observed at the inner and outer divertor target(s) in the DN and near-DN shapes suggests a redistribution of particles that would be expected in the presence of B × ∇B and E × B ion particle drifts in the scrapeoff layer (SOL) and divertor(s).
Keywords :
Divertor asymmetry , Particle drifts , Magnetic topology , recycling , Divertor pumping
