Status of integrated simulation of PFC surface evolution within the PSI-SciDAC project*

A new simulation capability is being developed within the PSI-SciDAC project to simulate the long-term evolution of plasma-exposed surfaces. The integrated model includes a wide range of phenomena, including models for a) the scrape-off layer plasma including fuel ions and extrinsic impurities (using SOLPS[1]), b) sheath physics (using the hPIC code), c) transport and redeposition of eroded wall material (using the new Monte Carlo code GITR), d) implantation of ions into the wall and subsequent erosion (using F-TRIDYN, an extension of TRIDYN [2]), and e) dynamics of the subsurface (Xolotl, a new continuum cluster dynamics code). These components have been combined to predict the evolution of surface morphology, recycling and retention, and the impact of erosion and redeposition on these processes, assuming steady-state conditions and without feedback on the background plasma. After benchmarking against PISCES experiments, we have now applied this model to make predictions for the ITER divertor. Predictions for standard and helium operations, and for a partially and completely detached divertor, will be presented. [1] R. Schneider et al, Contrib. Plasma Phys. 46 (2006) 3. [1] W. Miller et al, Comp. Phys. Comm. 51 (1988) 355.