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L. L. Lodestro, T. A. Casper, R. H. Cohen,
N. Mattor, L. D. Pearlstein, G. D. Porter,
M. Rensink, T. Rognlien, D. D. Ryutov,
H. A. Scott, and A. S. Wan
Lawrence Livermore National Laboratory P. O. Box 808, Livermore, CA 94551, USA
Abstract. Recent advances in the theory and modelling of tokamak edge,
scrape-off-layer (SOL) and divertor plasmas are described. The effects of the
poloidal
E×B drift on inner/outer divertor-plate asymmetries within a
1D analysis are shown to be in good agreement with experimental trends; above
a critical v
E×B, the model predicts transitions to
supersonic SOL flow at the inboard midplane. 2D simulations show the
importance of
E×B flow in the private-flux region and of 
B-drifts. A theory of rough plasma-facing surfaces is given, predicting
modifications to the SOL plasma. The parametric dependence of detached-plasma
states in slab geometry has been explored; with suffcient pumping, the
location of the ionization front can be controlled; otherwise only fronts near
the plate or the X-point are stable. Studies with a more accurate Monte-Carlo
neutrals model and a detailed non-LTE radiation-transport code indicate
various effects are important for quantitative modelling. Detailed simulations
of the DIII-D core and edge are presented; impurity and plasma flow are
discussed and shown to be well modelled with UEDGE.
IAEA 2001
