Interaction of tokamak plasma with fusion materials Project ID: WP12-PEX-03 Provider: Euratom under European Fusion Development Agreement Period: May 01, 2012 - Dec 31, 2013 Recipient -- coordinator: Max Planck Institute of Plasma Physics, Garching -- Hans Maier Co-recepient(s) / PI(s): Institute of Plasma Physics, Czech Academy of Sciences, Prague -- Ing. Jiří Matějíček, PhD. Co-investigators from IPP V. Weinzettl, D. Šesták, J. Horáček Aims of the project: The general objective is to see whether EUROFER is a suitable plasma facing component (PFC) material for the main chamber of a tokamak under high power H-mode conditions. This should be reached by reviewing the past experience of fusion devices operating with steel as PFC, including LHD, and through experimental tests on EU available facilities, where small protruding structures, probably made of tungsten, could also be foreseen to take higher power and particle fluxes. Since however EUROFER is currently not easily available in the small quantities typical for testing and laboratory purposes, a material with quite similar properties, as P92 steel, could be used. In addition to determine at which degree the performance of steel is determined by the wall conditioning (e.g., by the oxygen content in the steel), other particular objectives of this activity are: 1) Assess the reliability of the models for the plasma-steel interaction, in particular for the erosion rate due to neutrals and ions fluxes by comparing the calculations based on the available data for commercial steels with measurements in tokamaks. 2) Define a coherent R&D programme for estimating the effects of extended steel structures in a tokamak under DEMO relevant conditions. The definition should specify the nature of the samples (geometry, type of steel or thickness of coatings, etc…), their minimum number along the poloidal and toroidal directions for a meaningful analysis, the supporting modelling tools and the resources needed.