uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
Nuclear reaction analysis with ion microbeam of cross sections of surface layers deposited in tokamak divertor
Kungliga Tekniska Högskolan.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
Show others and affiliations
2007 (English)In: Journal of Nuclear Materials, ISSN 0022-3115, E-ISSN 1873-4820, Vol. 362, no 2-3, 215-221 p.Article in journal (Refereed) Published
Abstract [en]

Ion micro beam analysis has been applied to the investigation of plasma deposited layers covering the divertor tiles in the JET tokamak. Since the layers are about 100 μm thick they are too thick to be completely investigated by ordinary ion beam analysis. Cross sections of the layers were prepared by cutting and polishing. Elemental depth profiles were determined from the two dimensional images that could be derived by nuclear reaction analysis and resonant backscattering spectrometry, using ion beams focused to a few μm spot size. A combination of analysis methods are shown, which allow measurements of the concentration profiles of carbon, beryllium, deuterium, oxygen and stainless steel components at levels of a few percent, with an accuracy better than 10%.

Place, publisher, year, edition, pages
2007. Vol. 362, no 2-3, 215-221 p.
Keyword [en]
Divertor, Nuclear fusion reactor, Tokamak, Plasma deposition, Cross section (collision), Nuclear reaction
National Category
Physical Sciences Engineering and Technology
URN: urn:nbn:se:uu:diva-26270DOI: 10.1016/j.jnucmat.2007.01.046ISI: 000246895400013OAI: oai:DiVA.org:uu-26270DiVA: diva2:54044
Available from: 2007-02-15 Created: 2007-02-15 Last updated: 2016-04-11Bibliographically 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

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Petersson, PerPossnert, Göran
By organisation
Ion Physics
In the same journal
Journal of Nuclear Materials
Physical SciencesEngineering and Technology

Search outside of DiVA

GoogleGoogle Scholar

Altmetric score

Total: 224 hits
ReferencesLink to record
Permanent link

Direct link