Uniformity results of the multilayer mirrors used in the ALEXIS ultrasoft X-ray telescopes

Details Uniformity results of the multilayer mirrors used in the ALEXIS ultrasoft X-ray telescopes Uniformity results of the multilayer mirrors used in the ALEXIS ultrasoft X-ray telescopes

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993spie.1742..621r&link_type=abstract

In: Multilayer and grazing incidence X-ray/EUV optics for astronomy and projection lithography; Proceedings of the Meeting, San

Physics

Optics

1

Background Radiation, Cosmic X Rays, Geocoronal Emissions, Mirrors, X Ray Imagery, X Ray Sources, X Ray Telescopes, Angular Velocity, Curvature, Radii, Reflectance

Scientific paper

The Array of Low Energy X-ray Imaging Sensors (ALEXIS) experiment, a mini-satellite containing six wide angle EUV/ultrasoft X-ray telescopes, is scheduled to be launched by a Pegasus rocket into a 425 nautical mile orbit in 1992 to observe cosmic X-rays. The telescopes utilize near normal incidence optics featuring a 12.8 cm diameter, 13.52 cm radius of curvature spherical mirror with a Mo/Si multilayer coating. The multilayer coatings are tuned to wavelengths of 133, 171, and 186 A. In addition, the top layers are comprised of a unique 'wavetrap' designed to suppress the dominate background radiation at 304 A from the geocorona. We present measured performance data for these mirrors including the two dimensional uniformity of the multilayer as a function of both radius and angular rotation, the measured reflectivity at the primary wavelength and the effectiveness of the 'wavetrap'. We also discuss problems encountered due to contamination and design changes that have been made to mitigate the effect of contamination.

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