Removal of beryllium-containing films deposited in JET from mirror surfaces by laser cleaning

TitleRemoval of beryllium-containing films deposited in JET from mirror surfaces by laser cleaning
Publication TypeJournal Article
Year of Publication2011
AuthorsA. Widdowson, J.P Coad, G. De Temmerman, D. Farcage, D. Hole, D. Ivanova, A. Leontyev, M. Rubel, A. Semerok, A. Schmidt, P.Y Thro
JournalJournal of Nuclear Materials
Volume415
Issue1, Suppl.
Number1
PaginationS1199-S1202
Date PublishedAug
Type of ArticleArticle; Proceedings Paper
ISBN Number0022-3115
Abstract

A set of stainless steel (SS) and molybdenum mirror samples located in the divertor and at the outer mid-plane of the vessel were exposed in JET from 2005 to 2007. A selection of these mirror samples with well adhered deposits (i.e. not flaking) of up to a few hundred nanometers in thickness and with Be/C ratios ranging from 0 to similar to 1 have been cleaned using a laser system developed at CEA, Saclay. Following laser cleaning the recovered reflectivity was generally better in the infrared than the visible spectrum, with recovery of up to 90% of the initial reflectivity being obtained at 1600 nm for both Mo and SS mirrors falling as low as 20-30% of initial reflectivity at a wavelength of 400 nm for some SS mirrors, rising to similar to 80% for Mo mirrors. Some deposit remained on the mirrors after the cleaning trials. (C) 2010 EURATOM. Published by Elsevier B.V. All rights reserved.

DOI10.1016/j.jnucmat.2010.11.076
Division

PSI

Department

PSI-E

PID

a25f86e8ff264d2ddc3e2c788d561109

Alternate TitleJ. Nucl. Mater.

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