Loading of deuterium and helium by Pilot-PSI plasma and their detection by in-situ LIBS

K. Piip, H.J. van der Meiden, K. Bystrov, L. Hämarik, J. Karhunen, M. Aints, M. Laan, P. Paris, H. Seemen, A. Hakola, S. Brezinsek

    Research output: Contribution to journalArticleScientificpeer-review

    3 Citations (Scopus)

    Abstract

    Laser-induced breakdown spectroscopy (LIBS) is a promising method for quantifying the fuel content of the plasma-facing components of ITER both in between plasma discharges (in-situ. ) and after maintenance operations. The aim of the present study is to test the applicability of in-situ LIBS for monitoring deuterium (D) and helium (He) content of W samples exposed to fusion relevant plasma fluxes in the linear plasma device Pilot-PSI. The D loading was performed during 1000 s of plasma exposure at low (200-300 °. C) surface temperatures. Despite of low intensity and noisy LIBS spectra, H and D lines, at 656.1 and 656.3 nm, respectively, could be fitted with Lorentzian contours and reliably resolved at 1.2 mbar background pressure of argon. In the case of He loading, the samples were also exposed to plasma during 1000 s while the surface temperature reached values up to 720 °. C at the center. Already at 10- 2 mbar residual pressure of the device, the He I line at 587.6 nm was visible for the first 2-3 laser shots. We demonstrated that in-situ LIBS is a reliable method for detection of He and D retention in ITER-relevant materials. Nevertheless, for measuring relative and absolute concentrations of D and He in the ITER-relevant samples, further studies are needed.
    Original languageEnglish
    Pages (from-to)694-698
    Number of pages5
    JournalNuclear Materials and Energy
    Volume12
    Early online date2017
    DOIs
    Publication statusPublished - 1 Aug 2017
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Laser induced breakdown spectroscopy
    Helium
    laser-induced breakdown spectroscopy
    Deuterium
    deuterium
    helium
    Plasmas
    surface temperature
    Plasma devices
    H lines
    D lines
    Facings
    Argon
    plasma jets
    shot
    maintenance
    line spectra
    Fusion reactions
    fusion
    argon

    Keywords

    • plasma surface interaction
    • LIBS
    • fuel retention
    • tungsten

    Cite this

    Piip, K., van der Meiden, H. J., Bystrov, K., Hämarik, L., Karhunen, J., Aints, M., ... Brezinsek, S. (2017). Loading of deuterium and helium by Pilot-PSI plasma and their detection by in-situ LIBS. Nuclear Materials and Energy, 12, 694-698. https://doi.org/10.1016/j.nme.2016.12.034
    Piip, K. ; van der Meiden, H.J. ; Bystrov, K. ; Hämarik, L. ; Karhunen, J. ; Aints, M. ; Laan, M. ; Paris, P. ; Seemen, H. ; Hakola, A. ; Brezinsek, S. / Loading of deuterium and helium by Pilot-PSI plasma and their detection by in-situ LIBS. In: Nuclear Materials and Energy. 2017 ; Vol. 12. pp. 694-698.
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    title = "Loading of deuterium and helium by Pilot-PSI plasma and their detection by in-situ LIBS",
    abstract = "Laser-induced breakdown spectroscopy (LIBS) is a promising method for quantifying the fuel content of the plasma-facing components of ITER both in between plasma discharges (in-situ. ) and after maintenance operations. The aim of the present study is to test the applicability of in-situ LIBS for monitoring deuterium (D) and helium (He) content of W samples exposed to fusion relevant plasma fluxes in the linear plasma device Pilot-PSI. The D loading was performed during 1000 s of plasma exposure at low (200-300 °. C) surface temperatures. Despite of low intensity and noisy LIBS spectra, H and D lines, at 656.1 and 656.3 nm, respectively, could be fitted with Lorentzian contours and reliably resolved at 1.2 mbar background pressure of argon. In the case of He loading, the samples were also exposed to plasma during 1000 s while the surface temperature reached values up to 720 °. C at the center. Already at 10- 2 mbar residual pressure of the device, the He I line at 587.6 nm was visible for the first 2-3 laser shots. We demonstrated that in-situ LIBS is a reliable method for detection of He and D retention in ITER-relevant materials. Nevertheless, for measuring relative and absolute concentrations of D and He in the ITER-relevant samples, further studies are needed.",
    keywords = "plasma surface interaction, LIBS, fuel retention, tungsten",
    author = "K. Piip and {van der Meiden}, H.J. and K. Bystrov and L. H{\"a}marik and J. Karhunen and M. Aints and M. Laan and P. Paris and H. Seemen and A. Hakola and S. Brezinsek",
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    Piip, K, van der Meiden, HJ, Bystrov, K, Hämarik, L, Karhunen, J, Aints, M, Laan, M, Paris, P, Seemen, H, Hakola, A & Brezinsek, S 2017, 'Loading of deuterium and helium by Pilot-PSI plasma and their detection by in-situ LIBS', Nuclear Materials and Energy, vol. 12, pp. 694-698. https://doi.org/10.1016/j.nme.2016.12.034

    Loading of deuterium and helium by Pilot-PSI plasma and their detection by in-situ LIBS. / Piip, K.; van der Meiden, H.J.; Bystrov, K.; Hämarik, L.; Karhunen, J.; Aints, M.; Laan, M.; Paris, P.; Seemen, H.; Hakola, A.; Brezinsek, S.

    In: Nuclear Materials and Energy, Vol. 12, 01.08.2017, p. 694-698.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Loading of deuterium and helium by Pilot-PSI plasma and their detection by in-situ LIBS

    AU - Piip, K.

    AU - van der Meiden, H.J.

    AU - Bystrov, K.

    AU - Hämarik, L.

    AU - Karhunen, J.

    AU - Aints, M.

    AU - Laan, M.

    AU - Paris, P.

    AU - Seemen, H.

    AU - Hakola, A.

    AU - Brezinsek, S.

    PY - 2017/8/1

    Y1 - 2017/8/1

    N2 - Laser-induced breakdown spectroscopy (LIBS) is a promising method for quantifying the fuel content of the plasma-facing components of ITER both in between plasma discharges (in-situ. ) and after maintenance operations. The aim of the present study is to test the applicability of in-situ LIBS for monitoring deuterium (D) and helium (He) content of W samples exposed to fusion relevant plasma fluxes in the linear plasma device Pilot-PSI. The D loading was performed during 1000 s of plasma exposure at low (200-300 °. C) surface temperatures. Despite of low intensity and noisy LIBS spectra, H and D lines, at 656.1 and 656.3 nm, respectively, could be fitted with Lorentzian contours and reliably resolved at 1.2 mbar background pressure of argon. In the case of He loading, the samples were also exposed to plasma during 1000 s while the surface temperature reached values up to 720 °. C at the center. Already at 10- 2 mbar residual pressure of the device, the He I line at 587.6 nm was visible for the first 2-3 laser shots. We demonstrated that in-situ LIBS is a reliable method for detection of He and D retention in ITER-relevant materials. Nevertheless, for measuring relative and absolute concentrations of D and He in the ITER-relevant samples, further studies are needed.

    AB - Laser-induced breakdown spectroscopy (LIBS) is a promising method for quantifying the fuel content of the plasma-facing components of ITER both in between plasma discharges (in-situ. ) and after maintenance operations. The aim of the present study is to test the applicability of in-situ LIBS for monitoring deuterium (D) and helium (He) content of W samples exposed to fusion relevant plasma fluxes in the linear plasma device Pilot-PSI. The D loading was performed during 1000 s of plasma exposure at low (200-300 °. C) surface temperatures. Despite of low intensity and noisy LIBS spectra, H and D lines, at 656.1 and 656.3 nm, respectively, could be fitted with Lorentzian contours and reliably resolved at 1.2 mbar background pressure of argon. In the case of He loading, the samples were also exposed to plasma during 1000 s while the surface temperature reached values up to 720 °. C at the center. Already at 10- 2 mbar residual pressure of the device, the He I line at 587.6 nm was visible for the first 2-3 laser shots. We demonstrated that in-situ LIBS is a reliable method for detection of He and D retention in ITER-relevant materials. Nevertheless, for measuring relative and absolute concentrations of D and He in the ITER-relevant samples, further studies are needed.

    KW - plasma surface interaction

    KW - LIBS

    KW - fuel retention

    KW - tungsten

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    U2 - 10.1016/j.nme.2016.12.034

    DO - 10.1016/j.nme.2016.12.034

    M3 - Article

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    JO - Nuclear Materials and Energy

    JF - Nuclear Materials and Energy

    SN - 2352-1791

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    Piip K, van der Meiden HJ, Bystrov K, Hämarik L, Karhunen J, Aints M et al. Loading of deuterium and helium by Pilot-PSI plasma and their detection by in-situ LIBS. Nuclear Materials and Energy. 2017 Aug 1;12:694-698. https://doi.org/10.1016/j.nme.2016.12.034