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Assessment of Cleaning Methods for First Mirrors Tested in JET for ITER
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics. KTH, School of Electrical Engineering (EES), Centres, Alfvén Laboratory Centre for Space and Fusion Plasma Physics. (Association EURATOM-VR)
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics. KTH, School of Electrical Engineering (EES), Centres, Alfvén Laboratory Centre for Space and Fusion Plasma Physics. (Association EURATOM-VR)ORCID iD: 0000-0001-9901-6296
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2013 (English)In: Journal of Nuclear Materials, ISSN 0022-3115, E-ISSN 1873-4820, Vol. 438, no Suppl., S1241-S1244 p.Article in journal (Refereed) Published
Abstract [en]

Two cleaning techniques were used for removal of co-deposits from the tested first mirrors exposed in JET: (a) ultrasonic bath; (b) a broad range of polishing conditions from manual buffing to machine polishing with the diamond grain size of up to 3 lm. Reflectivity measurements were performed after each step in the cleaning procedure. Surfaces were also examined with electron microscopy and ion beam analysis methods. Ultrasonic cleaning leads to partial recovery of reflectivity due to enhanced detachment of deposits. Typically 30-50% of the original reflectivity was recovered in the visible light and 50-90% in the infrared region. One mirror was cleaned completely. Polishing with diamond paste may lead to successful removal of deposits but the damage to the surface in case of the large diamond grains was observed. Recovery of up to 100% of the initial reflectivity was achieved for some mirrors.

Place, publisher, year, edition, pages
Elsevier, 2013. Vol. 438, no Suppl., S1241-S1244 p.
Keyword [en]
Cleaning methods, Cleaning procedures, Diamond grain size, Infrared regions, Ion beam analysis, Partial recovery, Reflectivity measurements, Ultrasonic bath
National Category
Fusion, Plasma and Space Physics
Research subject
SRA - Energy
Identifiers
URN: urn:nbn:se:kth:diva-136854DOI: 10.1016/j.jnucmat.2013.01.275ISI: 000330795300273Scopus ID: 2-s2.0-84885471998OAI: oai:DiVA.org:kth-136854DiVA: diva2:677344
Conference
20th International Conference on Plasma-Surface Interactions in Controlled Fusion Devices (PSI), Forschungszentrum Julich, Aachen, Germany, May 21-25, 2012
Note

QC 20140204

Available from: 2013-12-09 Created: 2013-12-09 Last updated: 2017-12-06Bibliographically approved

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Rubel, Marek

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