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MM: Fachverband Metall- und Materialphysik
MM 9: Poster
MM 9.30: Poster
Montag, 17. März 2025, 18:30–20:30, P1
Irradiation Induced Defects in W-Re Alloys Studied by Positron Annihilation Spectroscopy — •Lisa-Marie Krug1, Danny Russell1, Maximilian Suhr1, Leon Chryssos1, Lucian Mathes1, Mikhail Zibrov2, Thomas Schwarz-Selinger2, and Christoph Hugenschmidt1 — 1Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, 85748 Garching, Germany — 2Max Planck Institute for Plasma Physics, 85748 Garching, Germany
The plasma-facing components in a fusion reactor have to withstand the irradiation of 14 MeV neutrons, which are released in the fusion reaction of deuterium and trithium. Tungsten is considered to be the most suitable plasma-facing material, due to its high melting point, high thermal conductivity and low erosion under fusion reactor operating conditions. In addition to radiation damage, neutron irradiation of tungsten creates transmutation elements such as rhenium. In this work, the effect of rhenium on the defect characteristics in self-ion irradiated tungsten is investigated. Self-ion irradiation is used to mimic the radiation damage caused by 14 MeV neutrons. Positron annihilation spectroscopy is used to provide non destructive, atomic scale resolution measurement of the irradiation damage. Coincidence Doppler broadening spectroscopy of the 511 keV annihilation line is used to provide element sensitive measurements of vacancy type defects. This allows us to test theoretical predictions that rhenium precipitates around voids.
Keywords: Positrons; Fusion; Tungsten; Rhenium; Doppler Broadening Spectroscopy