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Plasma cleaning of beryllium coated mirrors
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2016 (English)In: Physica Scripta, Institute of Physics Publishing (IOPP), 2016, no T167Conference paper (Refereed)Text
Abstract [en]

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.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2016. no T167
Keyword [en]
beryllium, first mirrors, ITER, JET, plasma sputtering, Beryllium deposits, Cleaning, Ion beams, Jets, Magnetoplasma, Mirrors, Reflection, Scanning electron microscopy, Tokamak devices, Tungsten, Tungsten deposits, First mirror, Ion beam analysis, Mirror reflectivity, Optical diagnostic systems, Radio frequencies, Reflectivity measurements, X ray photoelectron spectroscopy
National Category
Fusion, Plasma and Space Physics
URN: urn:nbn:se:kth:diva-188326DOI: 10.1088/0031-8949/T167/1/014069ScopusID: 2-s2.0-84959890451OAI: diva2:936248
15th International Conference on Plasma-Facing Materials and Components for Fusion Applications, PFMC 2015, 18 May 2015 through 22 May 2015

QC 20160613

Available from: 2016-06-13 Created: 2016-06-09 Last updated: 2016-06-13Bibliographically approved

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Ivanova, DaryaPetersson, PerRubel, Marek
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Alfvén Laboratory Centre for Space and Fusion Plasma PhysicsFusion Plasma Physics
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