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Mapping of hydrogen isotopes with a scanning nuclear microprobe
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics. (jonfysik)
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics. (jonfysik)
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics. (jonfysik)
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2008 (English)In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, ISSN 0168-583X, E-ISSN 1872-9584, Vol. 266, no 10, 2429-2432 p.Article in journal (Refereed) Published
Abstract [en]

Elastic recoil detection analysis using heavy ions with a scanning nuclear microprobe was applied to determine the content of hydrogen isotopes in carbon material facing fusion plasma in the JET fusion reactor. The hydrogen and deuterium concentrations in re-deposited material were obtained by mapping a cross sectional cut of a wall sample. De-trapping and hydrogen release caused by the primary ion beam were investigated. For both the deuterium and hydrogen concentration a drop of similar to 75% was observed from an extrapolated initial value to a final steady state region. A procedure was used to determine the initial concentration. In this way a mapping of the initial deuterium concentration could be obtained.

Place, publisher, year, edition, pages
2008. Vol. 266, no 10, 2429-2432 p.
National Category
Physical Sciences Subatomic Physics Engineering and Technology
Research subject
Ion Physics
Identifiers
URN: urn:nbn:se:uu:diva-111087DOI: 10.1016/j.nimb.2008.03.059ISI: 000257185600075OAI: oai:DiVA.org:uu-111087DiVA: diva2:279364
Available from: 2009-12-03 Created: 2009-12-03 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Ion Beam Analysis of First Wall Materials Exposed to Plasma in Fusion Devices
Open this publication in new window or tab >>Ion Beam Analysis of First Wall Materials Exposed to Plasma in Fusion Devices
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

One major step needed for fusion to become a reliable energy source is the development of materials for the extreme conditions (high temperature, radioactivity and erosion) caused by hot plasmas. The main goal of the present study is to use and optimise ion beam methods (lateral resolution and sensitivity) to characterise the distribution of hydrogen isotopes that act as fuel. Materials from the test reactors JET (Joint European Torus), TEXTOR (Tokamak Experiment for Technology Oriented Research) and Tore Supra have been investigated.

Deuterium, beryllium and carbon were measured by elastic recoil detection analysis (ERDA) and nuclear reaction analysis (NRA). To ensure high 3D spatial resolution a nuclear microbeam (spot size <10 µm) was used with 3He and 28Si beams. The release of hydrogen caused by the primary ion beam was monitored and accounted for.

Large variations in surface (top 10 µm) deuterium concentrations in carbon fibre composites (CFC) from Tore Supra and TEXTOR was found, pointing out the importance of small pits and local fibre structure in understanding fuel retention. At deeper depths into the CFC limiter tiles from Tore Supra, deuterium rich bands were observed confirming the correlation between the internal material structure and fuel storage in the bulk.

Sample cross sections from thick deposits on the JET divertor showed elemental distributions that were dominantly laminar although more complex structures also were observed. Depth profiles of this kind elucidate the plasma-wall interaction and material erosion/deposition processes in the reactor vessel.

The information gained in this thesis will improve the knowledge of first wall material for the next generation fusion reactors, concerning the fuel retention and the lifetime of the plasma facing materials which is important for safety as well as economical reasons.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2010. 61 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 752
Keyword
Ion beam analysis, Microbeam, Plasma wall interaction, Deuterium, Beryllium, Carbon fibre composites, Divertor, Nuclear reaction analysis, Helium-3
National Category
Fusion, Plasma and Space Physics
Research subject
Ion Physics
Identifiers
urn:nbn:se:uu:diva-128875 (URN)978-91-554-7846-9 (ISBN)
Public defence
2010-09-10, room 4101, Ångströmlaboratoiet, Lägerhyddsvägen 1, Uppsala, 10:00 (English)
Opponent
Supervisors
Available from: 2010-08-19 Created: 2010-07-29 Last updated: 2010-08-19

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Jensen, JensPossnert, Göran

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Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Physical SciencesSubatomic PhysicsEngineering and Technology

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