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Proceedings Paper

Thin-shell replication of grazing incidence (Wolter type I) SiC mirrors
Author(s): Norman Geril; Lawrence J. Grigely; Scott R. Wilson; Jitendra Singh Goela
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Paper 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.

Paper Details

Date Published: 2 June 1995
PDF: 13 pages
Proc. SPIE 2478, Space Telescopes and Instruments, (2 June 1995); doi: 10.1117/12.210927
Show Author Affiliations
Norman Geril, Technology Associates Corp. (United States)
Lawrence J. Grigely, Technology Associates Corp. (United States)
Scott R. Wilson, Sandia Systems, Inc. (United States)
Jitendra Singh Goela, Morton Advanced Materials (United States)

Published in SPIE Proceedings Vol. 2478:
Space Telescopes and Instruments
Pierre Y. Bely; James B. Breckinridge, Editor(s)

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