München 2019 – scientific programme

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P: Fachverband Plasmaphysik

P 12: Plasma Surface Interaction II - Helmholtz Graduate School IV

P 12.1: Invited Talk

Tuesday, March 19, 2019, 16:30–17:00, HS 20

Hydrogen permeation and retention in ITER steel — •Anne Houben, Jana Scheuer, Arkadi Kreter, Marcin Rasiński, Bernhard Unterberg, and Christian Linsmeier — Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung - Plasmaphysik, Partner of the Trilateral Euregio Cluster (TEC), 52425 Jülich, Germany

Fuel retention and hydrogen permeation in the first wall of future fusion devices is a crucial factor in order to estimate fuel losses and to guarantee an economical reactor operation. The main structure material of the ITER wall is 316L(N)-IG steel. Detailed permeation and thermal desorption spectroscopy (TDS) studies were performed on this steel.

The deuterium permeation through the bulk of the sample was measured on polished samples. In order to investigate the influence of technical surfaces, the sample surface was roughened or oxidized and measured. By comparing these results with the polished surface sample, the influence of technical surfaces can be estimated and evaluated.

Furthermore, the structure material will be exposed by high energetic deuterium particles in ITER. Therefore, the influence on the deuterium retention and permeation was studied by exposing 316L(N)-IG samples in the linear plasma device PSI-2 with deuterium plasma and performing permeation and TDS measurements afterwards. By comparing the results with unexposed samples, the change of the deuterium retention and permeation through the ITER wall during operation can be estimated.