Thin-shell replication of grazing incidence (Wolter type I) SiC mirrors

Norman Geril; Lawrence J. Grigely; Scott R. Wilson; Jitendra Singh Goela

doi:10.1117/12.210927

2 June 1995 Thin-shell replication of grazing incidence (Wolter type I) SiC mirrors

Norman Geril, Lawrence J. Grigely, Scott R. Wilson, Jitendra Singh Goela

Proceedings Volume 2478, Space Telescopes and Instruments; (1995) https://doi.org/10.1117/12.210927
Event: SPIE's 1995 Symposium on OE/Aerospace Sensing and Dual Use Photonics, 1995, Orlando, FL, United States

Abstract

Near-net-shape replication and ion beam figuring technologies were investigated for chemical vapor deposited (CVD) SiC to fabricate high performance, glancing incidence Wolter Type I x-ray mirrors. Small scale CVD experiments were performed on graphite mandrels to demonstrate replication of SiC shells that closely matched the design of the XMM 40th shell at 1/16th scale. The SiC shells were successfully separated from the graphite mandrels and then machined to the required dimensions. Ion beam figuring as a final fabrication step was investigated on Wolter Type I replicated SiC surfaces. Angular sputtering yields and surface roughness evolution with material removal were found to be sufficiently well behaved to favor ion beam figuring as a means of performing the final figuring step. The CVD-SiC fabrication technology for the x-ray telescopes as developed above appears scaleable. Finally, analysis of a single element CVD-SiC telescope, modeled after the AXAF-S 26th shell showed telescope deflections and weight to be 2.23 and 2.77 times less, respectively, than for a nickel replicated shell of the same dimensions.

Citation Download Citation

Norman Geril, Lawrence J. Grigely, Scott R. Wilson, and Jitendra Singh Goela "Thin-shell replication of grazing incidence (Wolter type I) SiC mirrors", Proc. SPIE 2478, Space Telescopes and Instruments, (2 June 1995); https://doi.org/10.1117/12.210927

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