CONCLUDING REMARKS Plasma-material interactions in fusion reactor

plasmas have a decisive impact on the overall plasma performance and impose stringent limitations on the reactor operation scenario. The effects of these inter-actions define the acceptable design options in several critical reactor design areas, such as impurity control, power and particle exhaust and selection of plasma facing materials.

The establishment of a comprehensive and credible database for plasma-material interaction effects and material response parameters is an essential pre-requisite for the selection of plasma facing reactor materials. The diversity of design requirements for these materials and the incompleteness of the existing database (particularly at elevated temperatures and high neutron fluences) make this choice difficult. For a better characterization of the present candidate materials or the development of new materials with improved properties, a certain degree of focusing of the research on plasma-material interaction is required.

International co-operation could also significantly enhance the efficiency of these efforts [49, 50, 53, 54].

ACKNOWLEDGEMENTS

The authors are indepted to Drs. M.F.A. Harrison, W.B. Gauster and V.R. Barabash for useful comments.

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