Speaker
Jan Engels
(Institut für Energie- und Klimaforschung – Plasmaphysik)
Description
In fusion power plants a tritium permeation barrier is required in order to prevent the loss of the fuel inventory. Moreover, the tritium permeation barrier is necessary to avoid that the radioactive tritium accumulates in the first wall, the cooling system, and other parts of the power plant. 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, due to its favorably low activation behavior, compared to the other candidates.
Y2O3 thin films are deposited on the reduced activation steel Eurofer97 by means of magnetron sputtering. The thin films are annealed at 550°C to achieve a stable and homogeneous cubic phase of the Y2O3 system. 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 measurement result suggests that the permeation reduction factor is in the range of one hundred.
Co-authors
Anne Houben
(Institut für Energie- und Klimaforschung – Plasmaphysik, Partner of the Trilateral Euregio Cluster (TEC), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany)
Christian Linsmeier
(Institut für Energie- und Klimaforschung – Plasmaphysik, Partner of the Trilateral Euregio Cluster (TEC), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany)
Jan Engels
(Institut für Energie- und Klimaforschung – Plasmaphysik, Partner of the Trilateral Euregio Cluster (TEC), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany)
Marcin Rasinski
(Institut für Energie- und Klimaforschung – Plasmaphysik, Partner of the Trilateral Euregio Cluster (TEC), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany)
