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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 Pretzler¹ — ¹Institut 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.