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P: Fachverband Plasmaphysik
P 9: Plasma Wall Interaction
P 9.3: Vortrag
Dienstag, 1. April 2025, 17:00–17:15, ZHG102
Depth-resolved deuterium retention profiles in displacement-damaged tungsten with laser-induced ablation quadrupole mass spectrometry — •Christoph Kawan1,2, Sebastijan Brezinsek1,2, Timo Dittmar1, Erik Wüst1,2, Thomas Schwarz-Selinger3, Liang Gao1, and Christian Linsmeier1 — 1Forschungszentrum Jülich GmbH, IFN-1 Plasmaphysics, 52425 Jülich, GER — 2Mathematisch- Naturwissenschaftliche Fakultät, Heinrich-Heine-Universität Düsseldorf, 40225 Düsseldorf, Germany — 3Max-Planck-Institut für Plasmaphysik, Boltzmannstrasse 2, 85748 Garching, Germany
Future fusion devices will operate with the hydrogen isotopes deuterium (D) and tritium (T) as fuel gases and tungsten (W) as wall material. The released high energetic neutrons from DT fusion reactions cause displacement damage in the W lattice and increase fuel retention by trapping and diffusion, leading to decreased reactor performance. Therefore, diagnostics are required to quantify the D and T content. Laser-induced ablation quadrupole mass spectrometry (LIA-QMS) is a promising method with good depth resolution and absolute quantification and can be combined with traditional diagnostics, such as laser-induced breakdown spectroscopy (LIBS). This study compares LIA-QMS D profiles with LIBS and nuclear reaction analysis (NRA) on self-damaged W samples. LIA-QMS shows a higher sensitivity (<0.1 at% D at 75 nm average ablation) than LIBS. Qualitatively, LIA-QMS can reproduce the NRA depth profiles, but quantitatively, LIA-QMS underestimates the total content by a factor of ∼3.
Keywords: Deuterium retention; laser-induced ablation; mass spectrometry; tungsten; plasma-wall-interaction