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P: Fachverband Plasmaphysik
P 20: Laser plasma and laser applications 2
P 20.3: Vortrag
Donnerstag, 12. März 2020, 14:45–15:00, b302
Characterisation of plasma-facing surfaces by double-pulse LIBS with picosecond pulses — •Erik Wüst1, Jannis Oelmann1, Sebastijan Brezinsek1, Christian Linsmeier1, and Claus Schneider2 — 1Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung, 52425 Jülich — 2Forschungszentrum Jülich GmbH, Peter-Grünberg-Institut, 52425 Jülich
Depth-resolved information about fuel retention and material mixing on plasma-facing components surfaces made out of Tungsten (W), Beryllium (Be) or Graphite (C) are required in order to understand plasma-surface interaction processes in long pulse plasma devices like ITER or W7-X. Laser-induced breakdown spectroscopy (LIBS) is here a promising candidate for the detection of hydrogen (H) isotopes, such as tritium which is critical from the point of safety.
The selection of W as plasma-facing material induces challenges regarding the detection of residual plasma fuel in the component due to overall low H isotope retention by implantation. One way to adapt to this by improving the detection limit of the technique is double-pulse LIBS (DP-LIBS) which uses a second laser pulse to further excite released H atoms in the plasma induced by the first pulse. This amplifies the Hα line intensity, which is used for H determination.
The perspective of DP-LIBS as a technique for H retention measurement is discussed and our approach to implement DP-LIBS with short pulses of a Nd:YAG laser (τ = 35 ps, with wavelengths 1064 nm, 532 nm and 355 nm available simultaneously) is presented.