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P: Fachverband Plasmaphysik
P 13: Plasma Wall Interactions
P 13.2: Vortrag
Mittwoch, 2. März 2016, 11:30–11:45, b302
Yttrium Oxide Coatings as Tritium Permeation Barriers — •Jan Engels, Anne Houben, and Christian Linsmeier — Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung - Plasmaphysik, 52425 Jülich, Germany
In fusion power plants the hydrogen isotopes deuterium and tritium are used as fuel. To prevent the loss of fuel and the accumulation of radioactive tritium in the first wall, the cooling system, and other parts of the fuel vessel, a tritium permeation barrier is necessary. Oxide thin films, e.g. Er2O3 and Y2O3, are promising candidates as tritium permeation barrier layers. With regard to the application, this is especially true for Y2O3, because of the favorably activation behavior of the yttrium, compared to the other candidates.
By means of magnetron sputtering Y2O3 thin films are deposited on Eurofer97, a reduced activation steel developed for fusion applications. The thin films are annealed at 600∘C to achieve a stable and homogeneous cubic phase of the Y2O3 system. The X-ray diffraction analysis proves that the final phase of the thin films is actually cubic. To be able to quantify the permeation reduction factor of the Y2O3 thin films a new gas-driven deuterium permeation measurement setup has been constructed. Comparing the permeation flux through a bare substrate and a coated Eurofer97 substrate, the permeation reduction factor can be determined. The first measurement result suggests that the permeation reduction factor is higher than ten.