Behaviour of Redeposited Tungsten Layers with Varying Impurity Content during Thermal and Radiation Loads

Tungsten is going to be implemented as a material for plasma-facing divertor tiles in an ITER tokamak. Accumulation of dust particles due to exfoliation of redeposited tungsten layers can severely affect the operation of a fusion devices. Behaviour of tungsten films deposited on tungsten, including...

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Published in:Journal of physics. Conference series 2019-06, Vol.1238 (1), p.12001
Main Authors: Begrambekov, L.B., Bidlevich, O.A., Grunin, A.V., Puntakov, N.A., Voityuk, A.N.
Format: Article
Language:English
Subjects:
Aluminum
Blistering
Dust
Exfoliation
Impurities
Iron
Radiation
Tungsten
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description Tungsten is going to be implemented as a material for plasma-facing divertor tiles in an ITER tokamak. Accumulation of dust particles due to exfoliation of redeposited tungsten layers can severely affect the operation of a fusion devices. Behaviour of tungsten films deposited on tungsten, including layers with added impurities of iron (0,2 at.% and 2 at.% concentration), as well as dust particles with Al impurity, has been studied. It is shown that a film with 2 at.% impurity of iron exhibits exfoliation and blistering when exposed to thermal and radiation loads, while tungsten dust particles with aluminium impurity undergo various structural changes depending on their Al content when heated.
doi_str_mv 10.1088/1742-6596/1238/1/012001
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subjects Aluminum
Blistering
Dust
Exfoliation
Impurities
Iron
Radiation
Tungsten
title Behaviour of Redeposited Tungsten Layers with Varying Impurity Content during Thermal and Radiation Loads
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