Ion Microbeam Analyses of Dust Particles and Codeposits from JET with the ITER-Like Wall
Stjepko Fazinić , Tonči Tadić , Marin Vukšić , Marek Rubel , P. Petersson , Elżbieta Fortuna-Zaleśna , A. Widdowson
AbstractGeneration 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.
|Journal series||Analytical Chemistry, ISSN 0003-2700, (A 45 pkt)|
|Publication size in sheets||0.5|
|Score||= 45.0, 31-12-2019, ArticleFromJournal|
|Publication indicators||= 1; : 2018 = 1.486; : 2018 = 6.35 (2) - 2018=6.337 (5)|
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