Erlangen 2026 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 17: Plasma Wall Interaction II
P 17.3: Vortrag
Donnerstag, 19. März 2026, 17:10–17:35, KH 02.016
Hydrogen Isotope Exchange in Tungsten Displacement Damaged at High Temperature — •Laurin Hess1,2 and Thomas Schwarz-Selinger2 — 1Technical University Munich, Munich, Germany — 2Max-Planck-Institute for Plasma Physics, Garching, Germany
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 increases significantly due to displacement damage produced by 14 MeV fusion neutrons. Over the last years, a basic understanding of the behaviour of hydrogen in point defects was acquired. However, damage at high temperatures can also produce nm-sized voids. To gain 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 <5 eV deuterium (D) from a low-temperature plasma. The retained deuterium was then exchanged for protium (P) using the same plasma loading process. D depth profiles were measured after D loading and periodically during P loading using 3He-NRA. After the loading, the retained hydrogen isotopes were measured using TDS. This showed that hydrogen in voids does not exchange at temperatures up to 370 K. At higher temperatures exchange starts to happen, with almost all hydrogen exchanged within hours during exposure at 460 K. The results were compared to the model proposed by Zibrov and Schmid [1].
[1] M. Zibrov, K. Schmid, Nucl. Mat. Eng. 30 (2022) 101121
Keywords: Isotope Exchange; Tungsten; High Temperature Damage; Voids; Hydrogen Retention