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Optical Engineering

Fabrication, performance, and figure metrology of epoxy-replicated aluminum foils for hard x-ray focusing multilayer-coated segmented conical optics
Author(s): Mario A. Jimenez-Garate; William W. Craig; Charles J. Hailey; Finn Erland Christensen; Ahsen M. Hussain
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Paper Abstract

We fabricated x-ray mirrors for hard x-ray (? 10 keV) telescopes using multilayer coatings and an improved epoxy-replicated aluminum foil (ERAF) nonvacuum technology. The ERAF optics have ~1 arcmin axial figure half-power diameter (HPD) and passed environmental testing. Reflectivity measurements at 8 keV on ERAFs with and without multilayer coatings show a 4.4 to 4.8 Å root mean square (rms) microroughness for correlation lengths ?15 µm. To reduce the dominant contribution of mirror assembly and large-scale distortion in the overall telescope HPD, we designed a figure metrology system and a new mounting technique. We describe a cylindrical metrology system built for fast axial and roundness figure measurement of hard x-ray conical optics. These developments lower cost and improve the optics performance of the HEFT (high-energy focusing telescope) and Constellation-X missions.

Paper Details

Date Published: 1 November 2000
PDF: 13 pages
Opt. Eng. 39(11) doi: 10.1117/1.1315572
Published in: Optical Engineering Volume 39, Issue 11
Show Author Affiliations
Mario A. Jimenez-Garate, Columbia Univ. (United States)
William W. Craig, Lawrence Livermore National Lab. (United States)
Charles J. Hailey, Columbia Univ. (United States)
Finn Erland Christensen, Danish Space Research Institute (Denmark)
Ahsen M. Hussain, Danish Space Research Inst. and Harvard-Smithsonian Ctr. for Astrophysics (Denmark)


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