FLUID SIMULATION OF BERYLLIUM TRANSPORT IN THE ITER GASEOUS DIVERTOR

The transport of either intrinsic or injected impurities will play a c rucial role in the energy loss mechanisms in the ITER gaseous/cold pla sma target divertor. Both 1-D and 2-D multi-charge state fluid codes a re used to model the transport of beryllium in the ITER SOL. Our major conclusion is that in order to model the containment of impurities, t he background flow field must be known in detail. Comparing 1-D and 2- D solutions, hydrogen flow reversal plays an important role in the ent rainment process. Further, the flow of particles from the core plasma also has a strong impact on the resultant entrainment of the impuritie s in both 1-D and 2-D. It is imperative that those components of poloi dal velocity due to ExB and diamagnetic drifts be included in the mode ls.