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Ion Microbeam Analyses of Dust Particles and Codeposits from JET with the ITER-Like Wall

Fazinić, Stjepko; Tonči, Tadić; Vukšić, Marin; Rubel, Marek; Petersson, Per; Fortuna-Zalesna, Elzbieta; Widdowson, Anna (2018) Ion Microbeam Analyses of Dust Particles and Codeposits from JET with the ITER-Like Wall. Analytical Chemistry, 90 (9). pp. 5744-5752. ISSN 0003-2700

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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 3He 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 μm in size with a thickness of 30–40 μm. 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.

Item Type: Article
Uncontrolled Keywords: Dust particles; IBA; JET; ITER-Like Wall
Subjects: NATURAL SCIENCES > Physics > Nuclear Physics
Divisions: Division of Experimental Physics
Project titleProject leaderProject codeProject type
Implementation of activities described in the Roadmap to Fusion during Horizon 2020 through a Joint programme of the members of the EUROfusion consortium-EUROfusionUNSPECIFIED633053EK
Depositing User: Stjepko Fazinić
Date Deposited: 19 Nov 2019 13:28
DOI: 10.1021/acs.analchem.8b00073

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