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 language | English (US) |
|---|---|
| Pages (from-to) | 77-85 |
| Number of pages | 9 |
| Journal | Proceedings of SPIE - The International Society for Optical Engineering |
| Volume | 3152 |
| DOIs | |
| State | Published - 1997 |
| Event | Materials, Manufacturing, and Measurement for Synchrotron Radiation Mirrors - San Diego, CA, United States Duration: Jul 30 1997 → Jul 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