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

    7 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

    Fingerprint

    Laser-induced Breakdown Spectroscopy
    laser-induced breakdown spectroscopy
    deuterium
    hydrogen isotopes
    Line
    Plasma
    atmospheric pressure
    time lag
    Delay Time
    H lines
    D lines
    Hydrogen
    Diagnostics
    Stark effect
    Laser
    maintenance
    gas pressure
    lasers
    discrimination
    signal to noise ratios

    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

    Cite this

    Paris, P., Butikova, J., Laan, M., Aints, M., Hakola, A., Piip, K., ... 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
    Paris, Peeter ; Butikova, Jelena ; Laan, Matti ; Aints, Märt ; Hakola, Antti ; Piip, Kaarel ; Tufail, Iram ; Veis, Pavel. / Detection of deuterium retention by LIBS at different background pressures. In: Physica Scripta. 2017 ; Vol. 2017, No. T170.
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    title = "Detection of deuterium retention by LIBS at different background pressures",
    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. {\circledC} 2017 University of Tartu.",
    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",
    author = "Peeter Paris and Jelena Butikova and Matti Laan and M{\"a}rt Aints and Antti Hakola and Kaarel Piip and Iram Tufail and Pavel Veis",
    year = "2017",
    doi = "10.1088/0031-8949/2017/T170/014003",
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    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, vol. 2017, no. T170, 014003. https://doi.org/10.1088/0031-8949/2017/T170/014003

    Detection of deuterium retention by LIBS at different background pressures. / Paris, Peeter; Butikova, Jelena; Laan, Matti; Aints, Märt; Hakola, Antti; Piip, Kaarel; Tufail, Iram; Veis, Pavel.

    In: Physica Scripta, Vol. 2017, No. T170, 014003, 2017.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Detection of deuterium retention by LIBS at different background pressures

    AU - Paris, Peeter

    AU - Butikova, Jelena

    AU - Laan, Matti

    AU - Aints, Märt

    AU - Hakola, Antti

    AU - Piip, Kaarel

    AU - Tufail, Iram

    AU - Veis, Pavel

    PY - 2017

    Y1 - 2017

    N2 - 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.

    AB - 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.

    KW - Atmospheric pressure

    KW - Atomic emission spectroscopy

    KW - Isotopes

    KW - Laser diagnostics

    KW - Laser induced breakdown spectroscopy

    KW - Nuclear reactors

    KW - Signal to noise ratio, Background pressure

    KW - Deuterium retention

    KW - Electron concentration

    KW - Hydrogen isotope

    KW - Laser induced plasma

    KW - Laserinduced breakdown spectroscopy (LIBS)

    KW - Plasma concentration

    KW - Signal-to-noise ratio decrease, Laser produced plasmas

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    U2 - 10.1088/0031-8949/2017/T170/014003

    DO - 10.1088/0031-8949/2017/T170/014003

    M3 - Article

    VL - 2017

    JO - Physica Scripta

    JF - Physica Scripta

    SN - 0031-8949

    IS - T170

    M1 - 014003

    ER -