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Micro ion beam analysis for the erosion of beryllium marker tiles in a tokamak limiter
Royal Inst Technol, Sch Elect Engn, Dept Fus Plasma Phys, S-10405 Stockholm, Sweden.
Royal Inst Technol, Sch Elect Engn, Dept Fus Plasma Phys, S-10405 Stockholm, Sweden.
Univ Calif San Diego, Energy Res Ctr, La Jolla, CA 92093 USA.
Royal Inst Technol, Sch Elect Engn, Dept Fus Plasma Phys, S-10405 Stockholm, Sweden.
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2019 (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. 450, p. 200-204Article in journal (Refereed) Published
Abstract [en]

Beryllium limiter marker tiles were exposed to plasma in the Joint European Torus to diagnose the erosion of main chamber wall materials. A limiter marker tile consists of a beryllium coating layer (7-9 mu m) on the top of bulk beryllium, with a nickel interlayer (2-3 mu m) between them. The thickness variation of the beryllium coating layer, after exposure to plasma, could indicate the erosion measured by ion beam analysis with backscattering spectrometry. However, interpretations from broad beam backscattering spectra were limited by the non-uniform surface structures. Therefore, micro-ion beam analysis (mu-IBA) with 3 MeV proton beam for Elastic back scattering spectrometry (EBS) and PIXE was used to scan samples. The spot size was in the range of 3-10 mu m. Scanned areas were analysed with scanning electron microscopy (SEM) as well. Combining results from mu-IBA and SEM, we obtained local spectra from carefully chosen areas on which the surface structures were relatively uniform. Local spectra suggested that the scanned area (approximate to 600 mu m x 1200 mu m) contained regions with serious erosion with only 2-3 mu m coating beryllium left, regions with intact marker tile, and droplets with 90% beryllium. The nonuniform erosion, droplets mainly formed by beryllium, and the possible mixture of beryllium and nickel were the major reasons that confused interpretation from broad beam EBS.

Place, publisher, year, edition, pages
2019. Vol. 450, p. 200-204
Keywords [en]
Microbeam, Limiter, Beryllium marker tile, Joint European Torus (JET), Plasma-facing components (PFC)
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:uu:diva-390989DOI: 10.1016/j.nimb.2018.08.028ISI: 000474501400041OAI: oai:DiVA.org:uu-390989DiVA, id: diva2:1343854
Conference
23rd International Conference on Ion Beam Analysis (IBA), OCT 08-13, 2017, Fudan Univ, Handan Campus, Shanghai, PEOPLES R CHINA
Note

JET contributors.

Available from: 2019-08-19 Created: 2019-08-19 Last updated: 2019-08-19Bibliographically approved

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Paneta, ValentinaPossnert, Göran

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Applied Nuclear Physics
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