W/SiC x-ray multilayers optimized for use above 100 keV
Abstract
We have developed a new depth-graded multilayer system comprising W and SiC layers, suitable for use as hard x-ray reflective coatings operating in the energy range 100-200 keV. Grazing-incidence x-ray reflectance at E = 8 keV was used to characterize the interface widths, as well as the temporal and thermal stability in both periodic and depth-graded W/SiC structures, whereas synchrotron radiation was used to measure the hard x-ray reflectance of a depth-graded multilayer designed specifically for use in the range E ~150-170 keV. We have modeled the hard x-ray reflectance using newly derived optical constants, which we determined from reflectance versus incidence angle measurements also made using synchrotron radiation, in the range E = 120-180 keV. We describe our experimental investigation in detail, compare the new W/SiC multilayers with both W/Si and W/B4C films that have been studied previously, and discuss the significance of these results with regard to the eventual development of a hard x-ray nuclear line telescope.
Additional Information
© 2003 Optical Society of America. Received 11 August 2002; revised manuscript received 29 October 2002. This research was funded by a Supporting Research and Technology grant from NASA.Attached Files
Published - WINao03.pdf
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Additional details
- Eprint ID
- 5279
- Resolver ID
- CaltechAUTHORS:WINao03
- NASA
- Created
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2006-10-09Created from EPrint's datestamp field
- Updated
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2020-03-09Created from EPrint's last_modified field
- Caltech groups
- Space Radiation Laboratory