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P: Fachverband Plasmaphysik
P 17: Poster II
P 17.41: Poster
Freitag, 3. September 2021, 14:00–16:00, P
Comparison of Laser Induced Breakdown Spectroscopy (LIBS) results on deuterium loaded high Z materials from lasers of different pulse durations — •Steffen Mittelmann1, Jannis Oelmann2, Ding Wu3, Gennady Sergienko2, Sebastijan Brezinsek2, Hongbin Ding3, and Georg Pretzler1 — 1Institut für Laser- und Plasmaphysik, Heinrich-Heine-Universität Düsseldorf, Germany — 2Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung - Plasmaphysik, Germany — 3Key Laboratory of Material Modification by Laser, Ion and Electron Beams, Dalian University of Technology, China
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) is used. This widely applied technique is executed by lasers with different pulse durations from ns to fs. A big advantage of ultrashort laser pulses 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 this laser system can be compared to ns- and ps-LIBS signals produced at Dalian University of Technology in China and the FZ Jülich, 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.