Contact Information

Research Consortium of Academy of Finland

Consortium leader:
taina.kurki-suonio@aalto.fi

Plasma-Surface Interactions and Impurity Migration

Doc. Markus Airila

VTT Materials for Power Engineering

markus.airila-miumau-vtt.fi

Plasma-surface interactions lie in the very heart of the technological challenge presented by ITER.

ITER will operate with a wall design consisting of beryllium (Be), tungsten (W) and carbon (C), each seleced due to their outstanding properties for particular wall components. However, wall erosion and the transport of eroded impurities due to the plasma leads to mixing of wall materials. This effect can compromise the power handling capability of the wall and lead to increased retention of radioactive tritium (T) inside the vessel.

Plasma-surface interactions in fusion devices are complex and diverse, necessitating heavy use of computer codes in modelling. The Monte Carlo impurity transport code ERO, originally developed at IPP-Garching and Forschungszentrum Jülich, collects the available plasma-surface interaction data from experiments and various computer models into a tool capable of making predictions for present experiments. We use ERO to model the erosion, migration and redeposition of neutral/charged particles on the material walls.

The project aims at developing a surface model that predicts correctly the material mixing in ITER and can be used for designing feasible operating scenarios. As a particular input for model development and benchmarking we use

  • Atomistic modelling data for the Be/W/C system from the group of Prof. Nordlund
  • Latest plasma-wall interaction results from the Iter-like wall experiment of JET