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Ion Microbeam Analyses of Dust Particles and Codeposits from JET with the ITER-Like Wall
Rudjer Boskovic Inst, Bijenicka 54, Zagreb 10000, Croatia..
Rudjer Boskovic Inst, Bijenicka 54, Zagreb 10000, Croatia..
Rudjer Boskovic Inst, Bijenicka 54, Zagreb 10000, Croatia..
KTH, School of Electrical Engineering and Computer Science (EECS), Fusion Plasma Physics.ORCID iD: 0000-0001-9901-6296
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2018 (English)In: Analytical Chemistry, ISSN 0003-2700, E-ISSN 1520-6882, Vol. 90, no 9, p. 5744-5752Article in journal (Refereed) Published
Abstract [en]

Generation of metal dust in the JET tokamak with the ITER-like wall (ILW) is a topic of vital interest to next-step fusion devices because of safety issues with plasma operation. Simultaneous Nuclear Reaction Analysis (NRA) and Particle Induced X-ray Emission (PIXE) with a focused four MeV He-3 microbeam was used to determine the composition of dust particles related to the JET operation with the ILW. The focus was on "Be-rich particles" collected from the deposition zone on the inner divertor tile. The particles found are composed of a mix of codeposited species up to 120 m in size with a thickness of 30-40 mu m, The main constituents are D from the fusion fuel, Be and W from the main plasma-facing components, and Ni and Cr from the Inconel grills of the antennas for auxiliary plasma heating. Elemental concentrations were estimated by iterative NRA-PIXE analysis. Two types of dust particles were found: (i) larger Be-rich particles with Be concentrations above 90 at% with a deuterium presence of up to 3.4 at% and containing Ni (1-3 at%), Cr (0.4-0.8 at%), W (0.2-0.9 at%), Fe (0.3-0.6 at%), and Cu and Ti in lower concentrations and (ii) small particles rich in Al and/or Si that were in some cases accompanied by other elements, such as Fe, Cu, or Ti or W and Mo.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2018. Vol. 90, no 9, p. 5744-5752
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Fusion, Plasma and Space Physics
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URN: urn:nbn:se:kth:diva-228440DOI: 10.1021/acs.analchem.8b00073ISI: 000431464400032PubMedID: 29620878Scopus ID: 2-s2.0-85046455477OAI: oai:DiVA.org:kth-228440DiVA, id: diva2:1210644
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QC 20180529

Available from: 2018-05-29 Created: 2018-05-29 Last updated: 2018-10-16Bibliographically approved

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Rubel, MarekPetersson, Per

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