Hannover 2020 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 20: Laser plasma and laser applications 2
P 20.2: Vortrag
Donnerstag, 12. März 2020, 14:30–14:45, b302
Comparison of Laser Induced Breakdown Spectroscopy (LIBS) Results on Deuterium Loaded High Z Materials from Lasers of Different Pulse Durations — •Steffen Mittelmann1, Jannis Oelmann2, Dongye Zhao2, Ding Wu3, Arkadi Kreter2, Sebastijan Brezinsek2, Hongbin Ding3, and Georg Pretzler1 — 1Institut für Laser- und Plasmaphysik, Heinrich-Heine-Universität Düsseldorf — 2Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung - Plasmaphysik — 3Key Laboratory of Material Modification by Laser, Ion and Electron Beams, Dalian University of Technology
Impurities in the wall material of upcoming fusion reactors can endanger the lifetime and quality of the confined plasma. To get an idea of deuterium or tritium retention at the wall the diagnostic Laser induced breakdown spectroscopy (LIBS) with possible in-situ application is used. This widely applied technique is executed by lasers with different pulse durations. In our institute we are operating a sub 10 fs Ti:Sa-laser that big advantage is the well-defined ablation area which leads to a high depth resolution. The results from LIBS experiments on tantalum exposed by deuterium in the linear plasma device PSI-2 with our laser system can be compared to ns- and ps-LIBS signals, which are shown here. An important aim of these studies is to reach a deeper understanding of the basic processes governing ablation, plasma formation and spectral emission in the different pulse duration regimes for finally deciding which type of laser pulses is the most promising for future fusion reactor wall analysis.