Determination of deuterium depth profiles in fusion-relevant wall materials by nanosecond LIBS

M. Suchonová, P. Veis, J. Karhunen, P. Paris, M. Pribula, K. Piip, M. Laan, C. Porosnicu, C. Lungu, A. Hakola

Research output: Contribution to journalArticleScientificpeer-review

8 Citations (Scopus)

Abstract

The ablation and fuel-retention characteristics of aluminum-tungsten (AlW) and beryllium-tungsten (BeW) samples have been determined using Laser Induced Breakdown Spectroscopy (LIBS) and compared to results obtained using Secondary Ion Mass Spectrometry (SIMS). The measurements have been made both at vacuum (of the order of 10-4 Pa) and at 50Pa of argon to especially enhance the intensities of the spectral lines of H and D. For reliable evaluation of the ablation rate of the samples the electron density ne and temperature Te of the LIBS plasma have been determined with the help of selected of spectral lines of Be, Al, and W. The electron density ne has been obtained from Stark broadening lines of Al I (308.7nm and 394.4nm) and Be II (457.3nm) and Te from the Saha-Boltzmann plot using W I and W II spectral lines having a higher value of the energy of upper states in order to prevent the influence of self-absorption on the results. The results indicate similar ablation characteristics between AlW (AlWD) and BeW (BeWD) samples but the inclusion of deuterium in the coating increases the ablation rate by a factor of 10 for both sample types. Concerning fuel retention more than one order of magnitude less D is retained in the AlWD sample than in BeWD. In the presence of background argon, the H and D lines were stronger and more easily distinguishable. This is a positive sign considering the real application in ITER where LIBS measurements are foreseen to be done during maintenance breaks. However the higher pressure gave a better signal, it is still far from the measurement conditions planned for ITER which need to be tested separately.
Original languageEnglish
Pages (from-to)611-616
Number of pages6
JournalNuclear Materials and Energy
Volume12
Issue numberJune
Early online date2017
DOIs
Publication statusPublished - 2017
MoE publication typeA1 Journal article-refereed

Fingerprint

Laser induced breakdown spectroscopy
laser-induced breakdown spectroscopy
Deuterium
Ablation
deuterium
Fusion reactions
fusion
ablation
Tungsten
Argon
line spectra
profiles
Carrier concentration
Beryllium
tungsten
argon
Electron temperature
H lines
D lines
Secondary ion mass spectrometry

Keywords

  • aluminum
  • beryllium
  • LIBS

Cite this

Suchonová, M. ; Veis, P. ; Karhunen, J. ; Paris, P. ; Pribula, M. ; Piip, K. ; Laan, M. ; Porosnicu, C. ; Lungu, C. ; Hakola, A. / Determination of deuterium depth profiles in fusion-relevant wall materials by nanosecond LIBS. In: Nuclear Materials and Energy. 2017 ; Vol. 12, No. June. pp. 611-616.
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abstract = "The ablation and fuel-retention characteristics of aluminum-tungsten (AlW) and beryllium-tungsten (BeW) samples have been determined using Laser Induced Breakdown Spectroscopy (LIBS) and compared to results obtained using Secondary Ion Mass Spectrometry (SIMS). The measurements have been made both at vacuum (of the order of 10-4 Pa) and at 50Pa of argon to especially enhance the intensities of the spectral lines of H and D. For reliable evaluation of the ablation rate of the samples the electron density ne and temperature Te of the LIBS plasma have been determined with the help of selected of spectral lines of Be, Al, and W. The electron density ne has been obtained from Stark broadening lines of Al I (308.7nm and 394.4nm) and Be II (457.3nm) and Te from the Saha-Boltzmann plot using W I and W II spectral lines having a higher value of the energy of upper states in order to prevent the influence of self-absorption on the results. The results indicate similar ablation characteristics between AlW (AlWD) and BeW (BeWD) samples but the inclusion of deuterium in the coating increases the ablation rate by a factor of 10 for both sample types. Concerning fuel retention more than one order of magnitude less D is retained in the AlWD sample than in BeWD. In the presence of background argon, the H and D lines were stronger and more easily distinguishable. This is a positive sign considering the real application in ITER where LIBS measurements are foreseen to be done during maintenance breaks. However the higher pressure gave a better signal, it is still far from the measurement conditions planned for ITER which need to be tested separately.",
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Suchonová, M, Veis, P, Karhunen, J, Paris, P, Pribula, M, Piip, K, Laan, M, Porosnicu, C, Lungu, C & Hakola, A 2017, 'Determination of deuterium depth profiles in fusion-relevant wall materials by nanosecond LIBS', Nuclear Materials and Energy, vol. 12, no. June, pp. 611-616. https://doi.org/10.1016/j.nme.2017.05.013

Determination of deuterium depth profiles in fusion-relevant wall materials by nanosecond LIBS. / Suchonová, M.; Veis, P.; Karhunen, J.; Paris, P.; Pribula, M.; Piip, K.; Laan, M.; Porosnicu, C.; Lungu, C.; Hakola, A.

In: Nuclear Materials and Energy, Vol. 12, No. June, 2017, p. 611-616.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Determination of deuterium depth profiles in fusion-relevant wall materials by nanosecond LIBS

AU - Suchonová, M.

AU - Veis, P.

AU - Karhunen, J.

AU - Paris, P.

AU - Pribula, M.

AU - Piip, K.

AU - Laan, M.

AU - Porosnicu, C.

AU - Lungu, C.

AU - Hakola, A.

PY - 2017

Y1 - 2017

N2 - The ablation and fuel-retention characteristics of aluminum-tungsten (AlW) and beryllium-tungsten (BeW) samples have been determined using Laser Induced Breakdown Spectroscopy (LIBS) and compared to results obtained using Secondary Ion Mass Spectrometry (SIMS). The measurements have been made both at vacuum (of the order of 10-4 Pa) and at 50Pa of argon to especially enhance the intensities of the spectral lines of H and D. For reliable evaluation of the ablation rate of the samples the electron density ne and temperature Te of the LIBS plasma have been determined with the help of selected of spectral lines of Be, Al, and W. The electron density ne has been obtained from Stark broadening lines of Al I (308.7nm and 394.4nm) and Be II (457.3nm) and Te from the Saha-Boltzmann plot using W I and W II spectral lines having a higher value of the energy of upper states in order to prevent the influence of self-absorption on the results. The results indicate similar ablation characteristics between AlW (AlWD) and BeW (BeWD) samples but the inclusion of deuterium in the coating increases the ablation rate by a factor of 10 for both sample types. Concerning fuel retention more than one order of magnitude less D is retained in the AlWD sample than in BeWD. In the presence of background argon, the H and D lines were stronger and more easily distinguishable. This is a positive sign considering the real application in ITER where LIBS measurements are foreseen to be done during maintenance breaks. However the higher pressure gave a better signal, it is still far from the measurement conditions planned for ITER which need to be tested separately.

AB - The ablation and fuel-retention characteristics of aluminum-tungsten (AlW) and beryllium-tungsten (BeW) samples have been determined using Laser Induced Breakdown Spectroscopy (LIBS) and compared to results obtained using Secondary Ion Mass Spectrometry (SIMS). The measurements have been made both at vacuum (of the order of 10-4 Pa) and at 50Pa of argon to especially enhance the intensities of the spectral lines of H and D. For reliable evaluation of the ablation rate of the samples the electron density ne and temperature Te of the LIBS plasma have been determined with the help of selected of spectral lines of Be, Al, and W. The electron density ne has been obtained from Stark broadening lines of Al I (308.7nm and 394.4nm) and Be II (457.3nm) and Te from the Saha-Boltzmann plot using W I and W II spectral lines having a higher value of the energy of upper states in order to prevent the influence of self-absorption on the results. The results indicate similar ablation characteristics between AlW (AlWD) and BeW (BeWD) samples but the inclusion of deuterium in the coating increases the ablation rate by a factor of 10 for both sample types. Concerning fuel retention more than one order of magnitude less D is retained in the AlWD sample than in BeWD. In the presence of background argon, the H and D lines were stronger and more easily distinguishable. This is a positive sign considering the real application in ITER where LIBS measurements are foreseen to be done during maintenance breaks. However the higher pressure gave a better signal, it is still far from the measurement conditions planned for ITER which need to be tested separately.

KW - aluminum

KW - beryllium

KW - LIBS

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U2 - 10.1016/j.nme.2017.05.013

DO - 10.1016/j.nme.2017.05.013

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JO - Nuclear Materials and Energy

JF - Nuclear Materials and Energy

SN - 2352-1791

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