Göttingen 2025 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 9: Plasma Wall Interaction
P 9.2: Vortrag
Dienstag, 1. April 2025, 16:45–17:00, ZHG102
Experimental Investigations of the Hydrogen Isotopes Retention and Permeation in Boron Coatings — •Eduard Warkentin1,2, Anne Houben1, Marcin Rasinski1, Hans Rudolf Koslowski1, Timo Dittmar1, Bernhard Unterberg1,2, and Christian Linsmeier1,2 — 1Forschungszentrum Jülich GmbH, Institut of Fusion Energy and Nuclear Waste Managment - Plasmaphysics (IFN-1), Jülich 52425, Germany — 2Ruhr-Universität Bochum, Faculty of Physics and Astronomy, Bochum 44801, Germany
Fuel permeation and retention in fusion reactor wall materials are important issues for plasma operation and safety reasons in ITER. The loss of the hydrogen isotope tritium, which will be used as fuel, has to be estimated and prevented. Due to the change of the ITER first wall material from Be to W, oxygen and other impurities in the vessel are not sufficiently gettered by a W wall. A thin boron layer which is applied during the regular wall conditioning phase can solve the problem and a more efficient plasma operation can be obtained. In order to investigate hydrogen retention and permeation of boron coatings, pure boron layers were fabricated by magnetron sputter deposition on W and steel substrates. After characterization, the deuterium permeation flux was measured and the layer permeation was obtained. Boron coated samples were exposed to different deuterium plasma and ion loadings in order to investigate retention via nuclear reaction analyis (NRA) and thermal desorptions spectroscopy (TDS).
Keywords: Permeation; Hydrogen retention; Boroncoating