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Proceedings Paper

Damage observations on synchrotron beam-line mirrors
Author(s): Peter Z. Takacs; Karen Furenlid; Lars Furenlid
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Paper Abstract

Catastrophic damage has been observed in ZERODUR mirrors used as first mirrors in two beam lines at the National Synchrotron Light Source. ZERODUR was selected as a substrate for these uncooled, grazing incidence mirrors because of its superior thermal expansion properties near room temperature. 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 mainly in a thin layer at the top of the substrate. Over a long time period the absorbed flux causes the glass material to compact, leading to a build-up of surface stress, gross figure changes, and the growth of fractures. The total dose of absorbed radiation for these mirrors is estimated to be in the range of 106 MRads, i.e. 1012 Rads, which is orders of magnitude greater than the dose used in conventional radiation damage studies for space-borne optics and deep UV lithography systems.

Paper Details

Date Published: 27 October 1998
PDF: 10 pages
Proc. SPIE 3427, Optical Systems Contamination and Degradation, (27 October 1998); doi: 10.1117/12.328511
Show Author Affiliations
Peter Z. Takacs, Brookhaven National Lab. (United States)
Karen Furenlid, Brookhaven National Lab. (United States)
Lars Furenlid, Brookhaven National Lab. (United States)


Published in SPIE Proceedings Vol. 3427:
Optical Systems Contamination and Degradation
Philip T. C. Chen; William E. McClintock; Gary J. Rottman, Editor(s)

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