Greifswald 2024 – scientific programme

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P: Fachverband Plasmaphysik

P 25: Poster III

P 25.21: Poster

Thursday, February 29, 2024, 16:30–18:30, ELP 6: Foyer

Deuterium Uptake in Tungsten Damaged at High Temperature — •Laurin Hess, Mikhail Zibrov, and Thomas Schwarz-Selinger — Max-Planck-Institut für Plasmaphysik, Boltzmannstraße 2, 85748 Garching b. München

Retention of hydrogen fuel in the tungsten wall of future fusion reactors is an essential area of research, as it is an integral part of modelling the tritium inventory. It has been shown that hydrogen retention significantly increases due to displacement damage produced by 14 MeV neutrons. Until now, many experiments have simulated the displace- ment damage in a reactor by damaging the tungsten at low temperatures using high energy ions. However, recent experiments have shown that retention behaves differently when the damaging happens at high temperatures, as in a fusion reactor. One possible explanation for this would be the formation of nm-sized voids. It has been suggested that the formation of vacancy clusters depends on the damaging rate. To account for this, two damaging modes have been compared. One with a high intermittent damaging rate using a raster scanned focused beam and one with a low continuous damaging rate using a wobbled defocused beam. In addition, the lateral homogeneity of the two modes has been examined using proton Elastic Backscattering Analysis of gold implantation. Then, the deuterium uptake of tungsten damaged at 1350 K has been studied by decorating the samples with 5 eV deuterium ions.

Keywords: Deuterium retention; Tungsten; High Temperature