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P: Fachverband Plasmaphysik
P 17: Plasma Wall Interaction II
P 17.4: Vortrag
Donnerstag, 19. März 2026, 17:35–18:00, KH 02.016
Effect of high displacement damage at different dose rates and temperatures on Deuterium retention in Eurofer97 — •Abdulrahman Albarodi1,2, Thomas Schwarz-Selinger2, Dina Mergia3, and Dimitrios Papadakis3 — 1Technical University of Munich, Garching, Germany — 2Max Planck Institute for Plasma Physics, Garching, Germany — 3NCSR Demokritos, Athens , Greece
Open-volume defects in irradiated metals are attributed to increased gas retention. In this study, deuterium (D) retention was used as an indicator for the evolution of open-volume defects at different temperatures and dose-rates. EUROFER97 samples were irradiated with a defocused continuous 11.6 MeV Au beam with a dose rate of 2.5-16.5 dpa/hr using ions to peak displacement damage doses of 50-100 dpa at 100-400°C. Rutherford-backscattering (RBS) with 4 MeV helium was used on aluminum surrogates to characterize the Au implantation profile. The Au depth profile showed a region of high displacement damage of 500 nm that is gold-free for uncontaminated defect analysis. X-ray diffraction showed clear differences in the lattice constant and the width of the Bragg peaks between damaged samples and undamaged reference. The samples were subsequently exposed to D-plasma at 100°C and low energy (<5 eV/D) until full D defect decoration. D depth profiles were measured using 3He nuclear reaction analysis. D-retention results are comparable with previous low-dose (0.6 dpa) irradiated samples at 100°C. For the sample damaged at 300-400°C, it is comparable to undamaged EUROFER97. NRA and XRD results show recovery of open-volume defects at 400°C.
Keywords: EUROFER97; Deuterium Retention; High displacement-damage