SMuK 2023 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 8: Plasma Wall Interaction I/HEPP IV
P 8.4: Vortrag
Dienstag, 21. März 2023, 18:10–18:25, CHE/0091
Influence of the Microstructure of Tritium Permeation Barrier Layers on Hydrogen Isotope Retention and Permeation — •Jonah Lennart Book, Anne Houben, and Christian Linsmeier — Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
For the safe and efficient operation of fusion reactors, tritium permeation barriers, or TPBs, are required to prevent fuel loss through first wall materials. Yttrium oxide is chosen as a TPB due its favorable neutron activation behavior compared to other candidates. Different Y2O3 layers several hundred nanometers thick are deposited onto a steel substrate using RF magnetron sputtering and studied using scanning electron microscopy. The samples are annealed at 550∘C to obtain the favorable cubic phase of Y2O3, which is verified by X-ray diffraction. Permeation measurements are performed by gas-driven deuterium permeation experiments from 25 mbar to 800 mbar at 300∘C to 550∘C. The calculation of the single layer permeability is introduced to obtain a comparable value of the permeation reduction effect for the different coatings. In addition, in lag time measurements the diffusivity of the sample is determined separately from the permeability. The permeation results and layer permeabilities are compared for the different microstructures. Furthermore, the hydrogen isotope retention of the different layers is measured using nuclear reaction analysis and evaluated with their permeation reduction performance.