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SMuK 2023 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 20: Laser Plasmas III/Codes and Modeling III

P 20.1: Hauptvortrag

Donnerstag, 23. März 2023, 17:30–18:00, CHE/0091

Laser-Induced Breakdown Spectroscopy (LIBS) for the detection of hydrogen isotopes stored in high-Z metals tungsten and tantalum — •Steffen Mittelmann1, Kévin Touchet3, Xianglei Mao3, Minok Park3, Vassilia Zorba3, Sebastijan Brezinsek2, and Georg Pretzler11Institut für Laser- und Plasmaphysik, Heinrich-Heine-Universität Düsseldorf — 2Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung - Plasmaphysik — 3Laser Technologies Group, Lawrence Berkeley National Laboratory, Berkeley

Laser-Induced Breakdown Spectroscopy (LIBS) is a promising technology for in-situ analysis of plasma facing components in confinement fusion experiments. It is of major interest to monitor the hydrogen isotope retention over many operation hours to guarantee the safety and lifetime of the facility. To be able to get full information of deuterium deposition in different surface layers, a LIBS setup with a high depth resolution is required. We present a comparison of such LIBS experiments with several laser systems of strongly differing parameters for optimizing the conditions. In our final study, ultra-short (ps- to fs-) UV-laser pulses were focused on tungsten and tantalum tiles that were exposed by a deuterium plasma in the linear plasma device PSI-2 at Forschungszentrum Jülich. We show that this concept can lead a Calibration-Free technique for quantitatively determining the amount of deuterium stored in the tiles under investigation without a-priori knowledge on the plasma.

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