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Plasma cleaning of beryllium coated mirrors
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2016 (English)In: Physica Scripta, ISSN 0031-8949, E-ISSN 1402-4896, Vol. T167, 014069Article in journal (Refereed) Published
Resource type
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. Vol. T167, 014069
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
Identifiers
URN: urn:nbn:se:kth:diva-188326DOI: 10.1088/0031-8949/T167/1/014069ISI: 000383504700070Scopus ID: 2-s2.0-84959890451OAI: oai:DiVA.org:kth-188326DiVA: diva2:936248
Conference
15th International Conference on Plasma-Facing Materials and Components for Fusion Applications, PFMC 2015, Aix-en-Provence, France, 18 May 2015 through 22 May 2015
Note

QC 20161024

Available from: 2016-06-13 Created: 2016-06-09 Last updated: 2016-10-24Bibliographically approved

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Ivanova, DaryaPetersson, PerRubel, Marek
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CiteExportLink to record
Permanent link

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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf