Ponente
Descripción
R. Rayaprolu1, I. Spahn2, D. Höschen1, S. Möller1, Ch. Linsmeier1
1 Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung - Plasma physik, 52425 Jülich, Germany
2 Forschungszentrum Jülich GmbH, Institut für Neurowissenschaften und Medizin -Nuklearchemie, 52425 Jülich, Germany
In the first wall, the neutrons create a combination of knock-on displacement damage, and a material composition change through transmutation damage. Consequently, the first-wall materials are required to withstand a great degree of damage during their lifetime and require extensive testing for post-irradiation performance. Presently material irradiation testing is undertaken in fission test reactors. However, a thermal neutron spectrum induces a distinctively different damage composition as compared to fusion neutrons and a significant difference is foreseen in the threshold reactions, of (n,2n), (n,α) and (n,p), which require high energy neutrons. Due to their higher energy, fusion neutrons are expected to induce higher quantities of He and H in EUROFER 97 as compared to fission reactors.
16 - 30 MeV protons can induce a combination of displacement and transmutation damage on first-wall fusion reactor materials. FISPACT-II simulations performed for a 30 MeV proton irradiation on EUROFER 97 show similar He transmutation ratio as fusion reactors. Additionally, a macroscopic range of damage of up to 1 mm without implantation is achieved using 30 MeV proton irradiation of EUROFER 97.
In this contribution, the FISPACT-II simulated energy damage scans for 16 – 30 MeV protons on EUROFER 97 will be presented and initial results from pilot irradiations using puzzle type samples containing 3 mm disks and a tensile test sample will be shown. An outlook of the planned irradiation matrix will be presented.
Acknowledgements
This work has been carried out within the framework of the EUROfusion Consortium, funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No 101052200 — EUROfusion). Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Commission. Neither the European Union nor the European Commission can be held responsible for them.
