Detection of deuterium retention by LIBS at different background pressures

Peeter Paris, Jelena Butikova, Matti Laan, Märt Aints, Antti Hakola, Kaarel Piip, Iram Tufail, Pavel Veis

    Research output: Contribution to journalArticleScientificpeer-review

    8 Citations (Scopus)

    Abstract

    ITER plans foresee the quantitative diagnostics of fuel retention in reactor walls at near-atmospheric pressures. Using laser induced breakdown spectroscopy (LIBS) for this purpose assumes a reliable resolving of Balmer α-lines of hydrogen isotopes in spectra of plasma produced by focused laser radiation onto the target surface. To develop LIBS for quantitative diagnostics of fuel retention during the maintenance breaks of ITER, the effect of background gas pressure on the laser-induced plasma characteristics has been studied. The background pressure limits the expansion rate of plasma and as a result it leads to higher plasma concentrations. At the same time the limiting factor of the resolving of hydrogen isotope lines is the lines broadening by Stark effect, which is the function of electron concentration. The resolving of lines become possible recording spectra at longer delay times after the laser pulse. On the other hand, at longer delays the signal-to-noise ratio decreases. As a compromise, we found that at atmospheric pressure and at delay times >2000 ns, a fitting of Hα and Dα lines by Voigt contours allows a reliable discrimination of these lines. © 2017 University of Tartu.
    Original languageEnglish
    Article number014003
    JournalPhysica Scripta
    Volume2017
    Issue numberT170
    Early online date2017
    DOIs
    Publication statusPublished - 2017
    MoE publication typeA1 Journal article-refereed
    Event16th International Conference on Plasma-Facing Materials and Components for Fusion Applications, PFMC 2017 - Neuss/Dusseldorf, Germany
    Duration: 16 May 201719 May 2017

    Keywords

    • Atmospheric pressure
    • Atomic emission spectroscopy
    • Isotopes
    • Laser diagnostics
    • Laser induced breakdown spectroscopy
    • Nuclear reactors
    • Signal to noise ratio, Background pressure
    • Deuterium retention
    • Electron concentration
    • Hydrogen isotope
    • Laser induced plasma
    • Laserinduced breakdown spectroscopy (LIBS)
    • Plasma concentration
    • Signal-to-noise ratio decrease, Laser produced plasmas

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  • Cite this

    Paris, P., Butikova, J., Laan, M., Aints, M., Hakola, A., Piip, K., Tufail, I., & Veis, P. (2017). Detection of deuterium retention by LIBS at different background pressures. Physica Scripta, 2017(T170), [014003]. https://doi.org/10.1088/0031-8949/2017/T170/014003