Hannover 2016 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 1: Helmholtz Graduate School for Plasma Physices I
P 1.3: Fachvortrag
Montag, 29. Februar 2016, 11:50–12:15, b302
Deuterium Implantation into Tungsten at Low Temperature — •Johannes Bauer1,2, Thomas Schwarz-Selinger1, Martin Balden1, and Klaus Schmid1 — 1Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, D-85748 Garching — 2Physik-Department E28, Technische Universität München, James-Franck-Str. 1, D-85748 Garching
To study the interaction of hydrogen isotopes with tungsten many experiments are conducted in linear plasma devices, which provide high enough hydrogen fluxes to supersaturate the tungsten sample and create defects such as blister. Here an alternative approach is presented. Instead of achieving a high deuterium concentration via high flux exposure, the sample temperature is reduced and the implantation energy of deuterium into tungsten is increased. The lower temperature associated with a reduction in diffusivity as well as the deeper implantation of deuterium lead to an increase of deuterium concentration within the implantation zone. Deuterium is stepwise implanted into polycrystalline tungsten up to a fluence of 1 × 1022 D/m2 with an energy of 3.0 keV/D at a sample temperature of 134 K. The retained deuterium is measured in-situ by nuclear reaction analysis. For low fluence approximately 100 % of the implanted deuterium is retained, while for higher fluence the retention saturates. Close to the surface deuterium concentrations up to 64 % are reached. This leads to massive grain orientation dependent blistering with blister sizes between 100 − 1000 nm at depths between 30 − 150 nm. Besides the characterization of the blisters their influence on deuterium transport is studied.