First mirror tests for ITER: Influence of material choice on the erosion/deposition mechanisms affecting optical reflectivity

G. De Temmerman, R. A. Pitts, V. S. Voitsenya, L. Marot, G. Veres, M. Maurer, P. Oelhafen

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Almost all optical diagnostics systems on ITER will be based on in-vessel metallic first mirrors. The possible deterioration of their surface reflectivity as a result of erosion by charge-exchange neutrals and re-deposition of material eroded from the plasma-facing components represents a serious concern for the reliability of spectroscopic and laser signals. A concerted effort within the tokamak community has been initiated to characterize these effects and seek mitigation methods. To date, the different damaging effects (erosion and deposition) have always been considered independently, neglecting any role that may be played by the substrate. In this contribution, we attempt to assess the influence of substrate material using different approaches: laboratory simulation experiments, mirror exposures in the divertor region of the TCV tokamak and numerical simulations using the Monte-Carlo code TRIDYN. Our results have potentially important implications for the choice of ITER first mirror materials.

Original languageEnglish
Pages (from-to)259-263
Number of pages5
JournalJournal of Nuclear Materials
Volume363-365
Issue number1-3
DOIs
Publication statusPublished - Jun 15 2007

Keywords

  • C0100
  • Erosion/deposition
  • ITER
  • Material properties
  • O0100
  • P0500
  • Reflectivity
  • TCV

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering

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