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Ion beam analysis of tungsten layers in EUROFER model systems and carbon plasma facing components
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.ORCID iD: 0000-0001-9299-3262
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.ORCID iD: 0000-0001-9901-6296
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2016 (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. 371, 355-359 p.Article in journal (Refereed) Published
Abstract [en]

The tungsten enriched surface layers in two fusion-relevant EUROFER steel model samples, consisting of an iron-tungsten mixture exposed to sputtering by deuterium ions, were studied by Rutherford backscattering spectrometry and medium energy ion scattering. Exposure conditions were the same for the two samples and the total amount of tungsten atoms per unit area in the enriched layers were similar (2e15 and 2.4e15 atoms/cm2 respectively), despite slightly different initial atomic compositions. A depth profile featuring exponential decrease in tungsten content towards higher depths with 10-20 atomic percent of tungsten at the surface and a decay constant between 0.05 and 0.08 Å-1 was indicated in one sample, whereas only the total areal density of tungsten atoms was measured in the other. In addition, two different beams, iodine and chlorine, were employed for elastic recoil detection analysis of the deposited layer on a polished graphite plate from a test limiter in the TEXTOR tokamak following experiments with tungsten hexafluoride injection. The chlorine beam was preferred for tungsten analysis, mainly because it (as opposed to the iodine beam) does not give rise to problems with overlap of forward scattered beam particles and recoiled tungsten in the spectrum.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 371, 355-359 p.
Keyword [en]
ERDA, EUROFER, Fusion, MEIS, Tungsten, Atoms, Carbon, Chlorine, Forward scattering, Fusion reactions, Iodine, Ion beams, Ions, Magnetoplasma, Rutherford backscattering spectroscopy, Elastic recoil detection analysis, Exposure parameters, Medium energy ion scattering, Orders of magnitude, Rutherford back-scattering spectrometry
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-177225DOI: 10.1016/j.nimb.2015.09.024ISI: 000373412000071Scopus ID: 2-s2.0-84960241915OAI: oai:DiVA.org:kth-177225DiVA: diva2:873938
Note

QC 20171027

Available from: 2015-11-25 Created: 2015-11-17 Last updated: 2017-10-27Bibliographically approved

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Ström, PetterRubel, Marek

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