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

M. Suchoňová (Corresponding Author), P. Veis (Corresponding Author), J. Karhunen, P. Paris, M. Pribula, K. Piip, M. Laan, C. Porosnicu, C. Lungu, Antti Hakola

    Research output: Contribution to journalArticleScientificpeer-review

    40 Citations (Scopus)


    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
    JournalNuclear Materials and Energy
    Issue numberJune
    Publication statusPublished - Aug 2017
    MoE publication typeA1 Journal article-refereed


    The authors thank for financial support from the Scientific Grant Agency of the Slovak Republic (VEGA) under the contract no. 1/0925/14 and also Slovak Research and Development Agency under the contract No DO7RP-0021-12. This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014–2018 under grant agreement No 633053.


    • aluminum
    • beryllium
    • LIBS


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