Micro-NRA and micro-3HIXE with 3He microbeam on samples exposed in ASDEX Upgrade and Pilot-PSI machines

Mitja Kelemen, Anze Zaloznik, Primoz Vavpetic, Matic Pecovnik, Primoz Pelicon, Antti Hakola, Aki Lahtinen, Juuso Karhunen, Kaarel Piip, Peeter Paris, Matti Laan, Karl Krieger, Martin Oberkofler, Hennie van der Meiden, Sabina Markelj, ASDEX Upgrade Team

    Research output: Contribution to journalArticleScientificpeer-review

    6 Citations (Scopus)


    Micro nuclear reaction analysis (micro-NRA) exploiting the nuclear reaction D(3He,p)4He was used for post-mortem analyses of special marker samples, exposed to deuterium plasma inside ASDEX Upgrade (AUG) tokamak and to the deuterium plasma jet in the Pilot-PSI linear plasma gun. Lateral concentration profiles of deuterium and erosion/deposition profiles of the marker materials were obtained by a combination of micro-NRA and particle induced X-ray emission by 3He beam (3HIXE). In the case of AUG samples, where 25nm thick W marker layers had been deposited on unpolished and polished graphite substrates, the effect of surface roughness on local erosion and deposition was also investigated. The lateral distribution of W concentration showed that erosion is much more distinct in the case of polished samples and the resulting surface shows a "leopard" skin pattern of W accumulated on carbon aggregates left on the surface from polishing. The Pilot-PSI samples indicated preferential accumulation of deuterium a few mm off from the centre of the region affected by the plasma beam. This is connected with the largest surface modifications while the thick deposited layers at the centre do not favour deuterium retention per se. The results were cross correlated with those obtained using laser-induced breakdown spectroscopy (LIBS). With its quantitative abilities, micro-NRA provided essential calibration data for in situ LIBS operation, as well as for complementary post mortem Secondary Ion Mass Spectroscopy (SIMS).
    Original languageEnglish
    Pages (from-to)179-184
    JournalNuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms
    Publication statusPublished - 1 Aug 2017
    MoE publication typeA1 Journal article-refereed


    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.


    • focused ion beams
    • deuterium
    • 3He
    • nuclear reaction analysis
    • 3HIXE
    • Deuterium
    • He


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