TECHNIQUES AND RESULTS OF TOKAMAK-EDGE SIMULATION

This paper describes recent development of the UEDGE code in three imp ortant areas. (1) Non-orthogonal grids allow accurate treatment of exp erimental geometries in which divertor plates intersect flux surfaces at oblique angles. (2) Radiating impurities are included by means of o ne or more continuity equations that describe transport and sources an d sinks due to ionization and recombination processes. (3) Advanced it erative methods that reduce storage and execution time allow us to fin d fully converged solutions of larger problems (i.e., finer grids). Sa mple calculations are presented to illustrate these developments.