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

6 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",
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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 -