Reflective metallic coatings for first mirrors on ITER

Baran Eren, Laurent Marot, Andrey Litnovsky, Maria Matveeva, Roland Steiner, Valentin Emberger, Marco Wisse, Daniel Mathys, Gregory Covarel, Ernst Meyer

Research output: Contribution to journalArticlepeer-review

Abstract

Metallic mirrors are foreseen to play a crucial role for all optical diagnostics in ITER. Therefore, the development of reliable techniques for the production of mirrors which are able to maintain their optical properties in the harsh ITER environment is highly important. By applying magnetron sputtering and evaporation techniques, rhodium and molybdenum films have been prepared for tokamak tests. The films were characterised in terms of chemical composition, surface roughness, crystallite structure, reflectivity and adhesion. No impurities were detected on the surface after deposition. The effects of deposition parameters and substrate temperature on the resulting crystallite structure, surface roughness and hence on the reflectivity, were investigated. The films are found to exhibit nanometric crystallites with a dense columnar structure. Open boundaries between the crystallite columns, which are sometimes present after evaporation, are found to reduce the reflectivity as compared to rhodium or molybdenum references.

Original languageEnglish
Pages (from-to)2593-2596
Number of pages4
JournalFusion Engineering and Design
Volume86
Issue number9-11
DOIs
StatePublished - Oct 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • General Materials Science
  • Nuclear Energy and Engineering
  • Civil and Structural Engineering

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