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Plasma cleaning of beryllium coated mirrors

Moser, L. and Marot, L. and Steiner, R. and Newman, M. and Widdowson, A. and Ivanova, D. and Likonen, J. and Petersson, P. and Pintsuk, G. and Rubel, M. and Meyer, E. and Contributors, J. E. T.. (2016) Plasma cleaning of beryllium coated mirrors. Physica Scripta, T167. 014069.

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Official URL: http://edoc.unibas.ch/52670/

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Abstract

Cleaning systems of metallic first mirrors are needed in more than 20 optical diagnostic systems from ITER to avoid reflectivity losses. Currently, plasma sputtering is considered as one of the most promising techniques to remove deposits coming from the main wall (mainly beryllium and tungsten). This work presents the results of plasma cleaning of rhodium and molybdenum mirrors exposed in JET-ILW and contaminated with typical tokamak elements (including beryllium and tungsten). Using radio frequency (13.56 MHz) argon or helium plasma, the removal of mixed layers was demonstrated and mirror reflectivity improved towards initial values. The cleaning was evaluated by performing reflectivity measurements, scanning electron microscopy, x-ray photoelectron spectroscopy and ion beam analysis.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Nanomechanik (Meyer)
UniBasel Contributors:Meyer, Ernst
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:IOP Publishing
ISSN:0031-8949
e-ISSN:1402-4896
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:15 Feb 2017 12:00
Deposited On:15 Feb 2017 12:00

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