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An Overview of Nuclear Micro beam Analysis of Surface and Bulk Fuel Retention in Carbon-Fibre Composites from Tore Supra
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy. (Jonfysik)
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy. (Jonfysik)
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2011 (English)In: Journal of Nuclear Materials, ISSN 0022-3115, E-ISSN 1873-4820, Vol. 451, no 1, s764-s764 p.Article in journal (Refereed) Published
Abstract [en]

Surface and bulk retention of deuterium in tiles of the pump limiter from Tore Supra was examined with nuclear reaction analysis using both standard and micro-beam techniques. The aim was to determine the variations in the content and distribution of fuel species in carbon-fibre composites. On plasma-facing surfaces from the deposition zone, the D content reaches 2.5 × 1019 cm−2 in about 8 μm thick top layer, but lateral differences reach even more than one order of magnitude. This is also measured in the erosion zone: 6.6 × 1017 cm−2 to 7.7 × 1018 cm−2 D atoms. Bulk content was examined on cross-sections opened by fracturing the tiles. Fuel is detected up to the depth of 1–1.5 mm beneath the plasma-facing surface in tiles from both the erosion and deposition zones. It occurs in bands, about 100 μm wide and several mm long, roughly parallel to the original plasma-facing surface.

Place, publisher, year, edition, pages
2011. Vol. 451, no 1, s764-s764 p.
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-128873DOI: 10.1016/j.jnucmat.2010.10.044ISI: 000298128100173OAI: oai:DiVA.org:uu-128873DiVA: diva2:331954
Available from: 2010-07-29 Created: 2010-07-29 Last updated: 2012-03-05Bibliographically 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.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 752
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
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)
Available from: 2010-08-19 Created: 2010-07-29 Last updated: 2010-08-19

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Petersson, PerPossnert, Göran
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