Comparison of LIBS results on ITER-relevant samples obtained by nanosecond and picosecond lasers

Peeter Paris, Jelena Butikova, Matti R. Laan, Antti Hakola, I. Jõgi, Jari Likonen, Eduard Grigore, Cristian Ruset

    Research output: Contribution to journalArticleScientificpeer-review

    17 Citations (Scopus)


    ITER foresees applying laser induced breakdown spectroscopy (LIBS) as a tool for quantitative assessment of fuel retention in the first walls. One open problem related to LIBS application is the choice of the laser type. Here we compare two Nd/YAG lasers with different pulse durations, 0.15 and 8 ns, working at λ = 1064 nm for LIBS studies of samples with D-doped W/Al coatings of ≈ 3 μm thickness (Al is used as a proxy of Be) on Mo. Low pressure argon was used as a background gas. Experiments were done in conditions where other factors (broadening of spectral lines, signal-to-noise ratio, limited thickness of coatings etc.) did not shadow the effect of laser pulse duration. For these reasons, low pressure argon was used as the background gas and fluences were kept at comparatively low values. Spectra of laser-produced plasma were recorded as a function of the number of laser pulses. Partially overlapping lines of hydrogen isotopes were fitted with Voigt contours, intensities were fitted and depth profiles of deuterium were reconstructed. The relative standard error of curve-fitting of spectra recorded with the laser of shorter pulse duration was two times smaller than that recorded by the longer pulse laser. The electron density was found from the Stark broadening of Hα line of the laser-produced plasma and the electron temperature of plasma was found on the basis W and Mo lines. It was found that in the case of ps laser an acceptable accuracy of the detection of deuterium was possible at considerably lower values of fluence. Steps needed for comparison of ps and ns lasers in ITER-relevant conditions were discussed.

    Original languageEnglish
    Number of pages5
    JournalNuclear Materials and Energy
    Early online date30 Nov 2018
    Publication statusPublished - Jan 2019
    MoE publication typeA1 Journal article-refereed


    This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement number 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. Work performed under EUROfusion WP PFC.


    • Detection of hydrogen isotopes
    • Elemental depth profiles
    • ITER-relevant coatings
    • LIBS diagnostics
    • Temperature of laser-produced plasma
    • EUROfusion


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