Aging simulations of plasma facing materials through a multiscale approach

Understanding the fusion reactors physics is critical to designing the energy supply of the near future. One of the efforts to reach, concerns the damaging evolution description of plasma facing materials (PFMs). In this environment, predictive tools, based on multiscale approaches, are necessary to estimate properly the phenomena leading to the PFM microstructural modifications. During NuMat 2022, we presented the first result of an open-source erosion simulator based on multiscale modeling. Although the tool is still in the calibration stage, it seems able to predict the nanoscopic evolution of PFMs showing a non-trivial dependence from the initial parameters. The computational model is based on the sequential combination of a plasma global code (surface geometry provided) and a feature scale particle-like Kinetic Monte Carlo (KMC) tool. The global model allows the thermodynamic and stoichiometric description of plasma state together with the related sheath potential evaluation. The three-dimensional KMC simulates the sequences of surface and near-surface structural modifications caused by plasma particles impinging a facing slab. Subsequently, particles can migrate or bind the lattice of the PFM. In this presentation, we will show the content of our adapted NuMat 22 talk, with useful technical information for those interested in using the code.