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(THP2/04) Edge and Coupled Core/Edge Transport Modelling in Tokamaks

   
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 $E\times B$ 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$E\times B$, the model predicts transitions to supersonic SOL flow  at the inboard midplane. 2D simulations show the importance of $E\times B$ flow in the private-flux region  and of $\nabla B$-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.

 

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