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The effect of gyration on the deposition of beryllium and deuterium at rough surface on the divertor tiles with ITER-like-wall in JET
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.
Royal Inst Technol, Sch Elect Engn, Dept Fus Plasma Phys, S-10405 Stockholm, Sweden.
Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, Tandem Laboratory.ORCID iD: 0000-0002-4840-291X
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2019 (English)In: Nuclear Materials and Energy, E-ISSN 2352-1791, Vol. 19, p. 155-160Article in journal (Refereed) Published
Abstract [en]

Experimental results from microbeam analyses on divertor tiles, through 2011-2012 and 2013-2014 operations in JET-ILW, showed that the deuterium retention and beryllium impurity deposition were non-uniform on the rough surface in micro meter scale. Frequently, Be and D were accumulated within pits, cracks and valleys in the range of similar to 10 mu m to similar to 100 mu m and selectively at side slopes within larger pits. In the deposited layers, it was also observed that cylindrical structures grow in a specific direction with respect to the magnetic field. In this work, a sample from the divertor in JET-ILW following 2013-2014 operation was analysed. The surface topography was measured with the focus stacking technique on photos from optical microscope and elemental distribution maps were obtained by micro-ion-beam analysis. In order to figure out the effect of ion gyro motion on Be and D deposition on the real divertor topography, a modelling of ion trajectories in plasma boundary was performed. Ion beam analysis data suggested that D accumulated on higher areas on the sample, while Be stayed on lower positions. The gyration of ions in edge plasma and corresponding impact positions on the sample surface could explain some IBA results qualitatively.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 19, p. 155-160
Keywords [en]
Micro-ion-beam, Deuterium deposition, Divertor, JET
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:uu:diva-389871DOI: 10.1016/j.nme.2019.02.025ISI: 000470746100025OAI: oai:DiVA.org:uu-389871DiVA, id: diva2:1339874
Available from: 2019-07-31 Created: 2019-07-31 Last updated: 2019-07-31Bibliographically approved

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