Optical Coatings as Mirrors for Optical Diagnostics

Authors

  • L. Marot Department of Physics, University of Basel
  • G. Arnoux CCFE, Culham Science Centre
  • A. Huber Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung - Plasmaphysik, D-52425 Jülich
  • V. Huber ülich Supercomputing Centre, Research Centre Jülich, D-52425 Jülich
  • Ph. Mertens Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung - Plasmaphysik, D-52425 Jülich
  • G. Sergienko Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung - Plasmaphysik, D-52425 Jülich
  • E. Meyer Department of Physics, University of Basel

DOI:

https://doi.org/10.6000/2369-3355.2015.02.03.1

Keywords:

First Mirrors, ITER, Mo, Rh coating, JET wide angle viewing system

Abstract

The aim of this work was to provide a comprehensive insight concerning coated films which might be used for first mirrors in ITER. The influence of the mirror crystallite size has been addressed as well as the coating techniques to provide nanocrystalline films. Tests of coated mirrors both in laboratories and in tokamaks are reviewed. For the tokamak tests a wide angle camera system has been installed in JET-ILW which is composed of a mirror box with 3 stainless steel mirrors coated with rhodium viewing the torus through a conically shaped aperture. The system delivered the required image quality for plasma monitoring and wall protection. No or insignificant degradation of the optical transmittance has been observed during the experimental campaign in 2014 with about 3000 plasma pulses in different magnetic field configurations.

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2016-01-05

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