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Dust Monitors in JET with ITER-like Wall for Diagnosis of Mobilized Particles and Co-Deposited Layers

(EUROFUSION) Fazinić, Stjepko; Provatas, Georgios; Božičević Mihalić, Iva; Tadić, Tonči; Rubel, Marek; Grzonka, Justyna; Petersson, Per; Widdowson, Anna; Moon, Sunwoo; Fortuna-Zaleśna, Elzbieta (2022) Dust Monitors in JET with ITER-like Wall for Diagnosis of Mobilized Particles and Co-Deposited Layers. Materials, 15 (23). ISSN 1996-1944

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Silicon plates were installed above the inner and outer divertor of the JET with the ITER-like wall (ILW) after the second and third ILW campaigns to monitor dust generation and deposition with the aim to determine the morphology and content of individual particles and co-deposits, including deuterium content. Particular interest was in metal-based particles: Be, W, steel, Cu. Ex-situ examination after two ILW campaigns was performed by a set of microscopy and ion beam methods including micro-beam nuclear reaction analysis and particle-induced X-ray emission. Different categories of Be-rich particles were found: co-deposits peeled-off from plasma-facing components (PFC), complex multi-element spherical objects, and solid metal splashes and regular spherical droplets. The fuel content on the two latter categories was at the level of 1 × 1016 at/cm−2 indicating that Be melting and splashing occurred in the very last phase of the second experimental campaign. The splashes adhere firmly to the substrate thus not posing risk of Be dust mobilisation. No tungsten droplets were detected. The only W-containing particles were fragments of tungsten coatings from the divertor tiles.

Item Type: Article
Uncontrolled Keywords: JET tokamak with ITER-like wall ; dust ; ion beam analysis ; deuterium ; beryllium ; tungsten
Subjects: NATURAL SCIENCES > Physics
Divisions: Division of Experimental Physics
Project titleProject leaderProject codeProject type
Provedba aktivnosti opisanih u Roadmap to Fusion tijekom Horizon 2020 kroz Zajednički program članova konzorcija EUROfusionTadić, Tonči633053EK
Depositing User: Stjepko Fazinić
Date Deposited: 29 Jun 2023 07:50
DOI: 10.3390/ma15238353

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