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In the IFMIF-DONES facility of the future, the back-plate behind the Li target will receive strong irradiation from high-energy neutrons. The potential use of the back-plate for material specimens is attractive with respect to providing complementary irradiation data for Eurofer. In this work, DPA (displacement per atom) and gas production rates as well as DPA gradients and temperature distributions have been studied for the center segment of the back-plate, using both a nominal beam and a reduced beam footprint. It is shown that specimens can be produced with high DPA in similar conditions to the DEMO first-wall. Based on the size of the SSTT (small specimen test technology) specimens, the limited number of samples obtainable from the adopted arrangement scheme is driven by a major constraint: the thickness of the back-plate. A parametric study of the back-plate’s thickness provides an alternative arrangement scheme; thus, the DPA and gradient of the specimens are remarkably improved.

An integrated multi-physics coupling system has been developed for fusion reactor systems analyses. This system has an advanced Monte Carlo (MC) modeling approach for converting complex CAD models to MC models with hybrid constructive solid and unstructured mesh geometries, and a high-fidelity coupling approach for data mapping from MC to thermal hydraulics and structural mechanics codes. The system was proven to be reliable, robust and efficient through verification calculations.