X-ray-induced damage observations on ZERODUR mirrors

Peter Z. Takacs, Karen Furenlid, Lars Furenlid

Research output: Contribution to journalConference article

2 Scopus citations

Abstract

Catastrophic damage has been observed in some ZERODUR mirrors used as first mirrors in two beam lines at the National Synchrotron Light Source. Despite the high reflectivity of the coatings used on these mirrors, a significant flux of high energy photons penetrates below the coating and is absorbed in the substrate. Although model calculations indicate that the local temperature does not increase significantly, we suspect that over long time periods the absorbed flux produces structural changes in the material, leading to a build-up of surface stress, gross figure changes, and growth of fractures. These changes are probably related to the nature of the two-phase glass- ceramic composition of the ZERODUR material. Metal mirrors and single-phase materials do not exhibit such catastrophic damage under similar exposure conditions.

Original languageEnglish (US)
Pages (from-to)77-85
Number of pages9
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume3152
DOIs
StatePublished - Dec 1 1997
Externally publishedYes
EventMaterials, Manufacturing, and Measurement for Synchrotron Radiation Mirrors - San Diego, CA, United States
Duration: Jul 30 1997Jul 30 1997

Keywords

  • Fused silica
  • Radiation damage
  • Synchrotron beam lines
  • Synchrotron minors
  • X-ray damage
  • X-ray optics
  • X-rays
  • ZERODUR

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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