Göttingen 2025 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 17: Poster Session II
P 17.18: Poster
Mittwoch, 2. April 2025, 16:15–18:15, ZHG Foyer 1. OG
Deuterium Uptake and Isotope Exchange in Tungsten Displacement Damaged at High Temperature — •Laurin Hess1,2 and Thomas Schwarz-Selinger2 — 1Technische Universität München, Arcisstr. 21, 80333 München — 2Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching b. München
Retention of hydrogen fuel in tungsten is an active area of research, as it is an integral part of modelling the tritium inventory and certification of future fusion reactors. It has been shown that hydrogen retention significantly increases due to displacement damage produced by 14 MeV fusion neutrons. Over the last years, basic understanding of the behaviour of hydrogen in point defects was acquired. However, damage at high temperatures can also produce nm-sized voids. Only little research has been done to examine the behaviour of hydrogen in these voids. To improve the understanding of hydrogen in nm-sized voids, tungsten single crystals were self-damaged by irradiation with 20 MeV tungsten ions at 1370 K and decorated with different fluences of 5 eV deuterium from a low-temperature plasma. The retention of deuterium was measured via 3He Nuclear Reaction Analysis as a function of D fluence. In addition, the exchange of retained deuterium with protium has been studied by exposing deuterium-decorated samples to different fluences of 5 eV protium.
Keywords: Deuterium; Tungsten; Retention; Voids