Greifswald 2024 – scientific programme
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P: Fachverband Plasmaphysik
P 3: Plasma Wall Interaction I
P 3.7: Talk
Monday, February 26, 2024, 15:45–16:00, ELP 6: HS 3
Studies of deuterium retention in pre-damaged tungsten with laser-induced ablation quadrupole mass spectrometry — •Christoph Kawan1,2, Sebastijan Brezinsek1, Timo Dittmar1, Thomas Schwarz-Selinger3, and Erik Wüst1 — 1Forschungszentrum Jülich GmbH, Institut für Energie und Klimaforschung - Plasmaphysik, Partner of the Trilateral Euregio Cluster (TEC), 52425 Jülich, Germany — 2Mathematisch-Naturwissenschaftliche Fakultät, Heinrich-Heine-Universität Düsseldorf, 40225 Düsseldorf, Germany — 3Max-Planck-Institut für Plasmaphysik, D-85748 Garching, Germany
Future fusion devices based on magnetically confined plasma will operate with the hydrogen (H) isotopes deuterium (D) and tritium (T) as fuel gases and tungsten (W) as wall material. The extreme conditions inside the fusion device damage the wall surface and change the H retention properties. T accumulating in the W wall is a high risk in terms of radiation safety. Therefore, in-situ methods are needed to quantify the amount of H isotopes. Laser-induced ablation quadrupole mass spectrometry (LIA-QMS) is a promising method which can provide H isotope depth profiles in the wall material, potentially also in-situ. Here, LIA-QMS depth profiles on targets with different amounts of D with established methods such as laser-induced breakdown spectrometry (LIBS) and nuclear reaction analysis (NRA) are compared. LIA-QMS shows a higher sensitivity than LIBS (<0.1 at% with 150 nm depth resolution). The absolute amount differs compared to NRA (6 at% QMS, 1 at% NRA), thus requiring an optimized calibration.
Keywords: LIA-QMS; Mass spectrometry; tungsten; plasma wall interaction; nuclear fusion