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Superpolishing and Precision Metrology on a Metal Mandrel and Replicated Segments for Constellation-XWe have superpolished a diamond-turned aluminum mandrel (coated with electroless Ni) to an axial roughness of 0.34 nm rms. The mandrel is made to the Astro-E secondary mirror design for the 81st shell. Precision metrology at 100 mm to submicron scales has established the power spectral density of the mandrel and ultralightweight gold coated replicated segments. Predicted image quality of a set of optimally aligned replicated segments of this and a matching primary is substantially improved as compared to the flight mirrors for Astro-E. This approach using metal mandrels, superpolishing, and replicated ultralightweight foil mirrors, may represent a cost-effective approach to meeting the 15 arcsec half-energy width and weight requirements for the Constellation-X mission. Descriptions of the polishing apparatus, the precision metrology instruments, and the surface data analysis are presented. The general methods described are applicable to precision optics for both normal incidence and grazing incidence optics.
Document ID
20000025030
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Content, D.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Lyons, J.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Saha, T.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Wright, G.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Zaniewski, J.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Petre, R.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Chan, K. W.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 1999
Subject Category
Engineering (General)
Meeting Information
Meeting: SPIE Conference
Country: United States
Start Date: July 1, 1999
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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