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, ASDEX Upgrade Teamg, Hennie van der Meiden, Sabina Markelj

Research output: Contribution to journalArticleScientificpeer-review

Abstract

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
Number of pages6
JournalNuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms
Volume404
DOIs
Publication statusPublished - 1 Aug 2017
MoE publication typeA1 Journal article-refereed

Fingerprint

microbeams
Deuterium
nuclear reactions
Nuclear reactions
markers
erosion
deuterium plasma
deuterium
laser-induced breakdown spectroscopy
Laser induced breakdown spectroscopy
Erosion
plasma guns
Plasma guns
Plasmas
profiles
polishing
Plasma jets
plasma jets
surface roughness
Polishing

Keywords

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

Cite this

Kelemen, Mitja ; Zaloznik, Anze ; Vavpetic, Primoz ; Pecovnik, Matic ; Pelicon, Primoz ; Hakola, Antti ; Lahtinen, Aki ; Karhunen, Juuso ; Piip, Kaarel ; Paris, Peeter ; Laan, Matti ; Krieger, Karl ; Oberkofler, Martin ; Teamg, ASDEX Upgrade ; van der Meiden, Hennie ; Markelj, Sabina. / Micro-NRA and micro-3HIXE with 3He microbeam on samples exposed in ASDEX Upgrade and Pilot-PSI machines. In: Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms. 2017 ; Vol. 404. pp. 179-184.
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abstract = "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).",
keywords = "focused ion beams, deuterium, 3He, nuclear reaction analysis, 3HIXE, Deuterium, He",
author = "Mitja Kelemen and Anze Zaloznik and Primoz Vavpetic and Matic Pecovnik and Primoz Pelicon and Antti Hakola and Aki Lahtinen and Juuso Karhunen and Kaarel Piip and Peeter Paris and Matti Laan and Karl Krieger and Martin Oberkofler and Teamg, {ASDEX Upgrade} and {van der Meiden}, Hennie and Sabina Markelj",
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Kelemen, M, Zaloznik, A, Vavpetic, P, Pecovnik, M, Pelicon, P, Hakola, A, Lahtinen, A, Karhunen, J, Piip, K, Paris, P, Laan, M, Krieger, K, Oberkofler, M, Teamg, ASDEXU, van der Meiden, H & Markelj, S 2017, 'Micro-NRA and micro-3HIXE with 3He microbeam on samples exposed in ASDEX Upgrade and Pilot-PSI machines', Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms, vol. 404, pp. 179-184. https://doi.org/10.1016/j.nimb.2017.01.072

Micro-NRA and micro-3HIXE with 3He microbeam on samples exposed in ASDEX Upgrade and Pilot-PSI machines. / Kelemen, Mitja; Zaloznik, Anze; Vavpetic, Primoz; Pecovnik, Matic; Pelicon, Primoz; Hakola, Antti; Lahtinen, Aki; Karhunen, Juuso; Piip, Kaarel; Paris, Peeter; Laan, Matti; Krieger, Karl; Oberkofler, Martin; Teamg, ASDEX Upgrade; van der Meiden, Hennie; Markelj, Sabina.

In: Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms, Vol. 404, 01.08.2017, p. 179-184.

Research output: Contribution to journalArticleScientificpeer-review

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T1 - Micro-NRA and micro-3HIXE with 3He microbeam on samples exposed in ASDEX Upgrade and Pilot-PSI machines

AU - Kelemen, Mitja

AU - Zaloznik, Anze

AU - Vavpetic, Primoz

AU - Pecovnik, Matic

AU - Pelicon, Primoz

AU - Hakola, Antti

AU - Lahtinen, Aki

AU - Karhunen, Juuso

AU - Piip, Kaarel

AU - Paris, Peeter

AU - Laan, Matti

AU - Krieger, Karl

AU - Oberkofler, Martin

AU - Teamg, ASDEX Upgrade

AU - van der Meiden, Hennie

AU - Markelj, Sabina

PY - 2017/8/1

Y1 - 2017/8/1

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KW - 3He

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KW - He

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