X-ray induced damage observations in ZERODUR mirrors [electronic resource].

Published:: Washington, D.C. : United States. Dept. of Energy. Office of Energy Research, 1997.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:: 11 pages : digital, PDF file
Additional Creators:: Brookhaven National Laboratory, United States. Department of Energy. Office of Energy Research, and United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

Catastrophic damage has been observed in some ZERODUR mirrors used as first mirrors in two beam lines at the National Synchrotron Light Source (NSLS). 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, the authors 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.

Report Numbers:

E 1.99:bnl--64743
E 1.99: conf-970706--
conf-970706--
bnl--64743

Subject(s):

Particle Accelerators

Other Subject(s):

Note:

Published through SciTech Connect.
07/01/1997.
"bnl--64743"
" conf-970706--"
"DE98000310"
Annual meeting of the Society of Photo-Optical Instrumentation Engineers, San Diego, CA (United States), 27 Jul - 1 Aug 1997.
Takacs, P.Z.; Furenlid, K.; Furenlid, L.

Funding Information:

AC02-76CH00016

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