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Fabrication and performance of Constellation-X hard x-ray telescope prototype optics using segmented glass

Hailey, Charles J. and Christensen, Finn E. and Craig, William W. and Harrison, Fiona A. and Koglin, Jason E. and Petre, Robert and Yu, Haitao and Zhang, William W. (2004) Fabrication and performance of Constellation-X hard x-ray telescope prototype optics using segmented glass. In: Optics for EUV, X-Ray, and Gamma-Ray Astronomy. Proceedings of SPIE. No.5168. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, pp. 90-99. ISBN 9780819450418.

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We report on the fabrication and performance of prototype optics for the Constellation-X hard X-ray telescope (HXT). The prototypes utilize segmented-glass optics. Multiple glass segments are combined to produce telescope shells. The shells are separated by and epoxied to graphite rods, and each layer of rods is precisely machined to match the required optical geometry of the corresponding glass shell. This error-compensating, monolithic assembly and alignment (EMAAL) procedure is novel. Two prototypes are described. The first used 10cm long thermally-slumped glass pieces produced by slumping into a concave mandrel with no subsequent replication. This prototype obtained 45" (2-bounce HPD). The second prototype was the first attempt to mount epoxy-replicated, thermally-slumped glass optics using EMAAL. The latter prototype demonstrated our ability to produce and mount glass shells whose figure and performance are faithful representations of the original replication mandrel. The average performance was 45", with the best replicated segment providing 33" (2-bounce HPD) performance, consistent with the ~30" measured with laser reflectometry and interferometry prior to mounting. Both these prototypes substantially exceeded the HXT requirement of 60".

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Christensen, Finn E.0000-0001-5679-1946
Harrison, Fiona A.0000-0003-2992-8024
Zhang, William W.0000-0002-1426-9698
Additional Information:© 2004 Society of Photo-Optical Instrumentation Engineers (SPIE). This work is supported by NASA grants to Columbia University: Thermally Formed Optics for X-ray and Gamma-ray Astronomy (NAG5-5260), High Energy Focusing Telescope (CalTech subaward 1019776) and Critical Technologies for the Constellation-X Hard X-ray Telescope (CalTech subaward 046806).
Group:Space Radiation Laboratory
Funding AgencyGrant Number
Subject Keywords:Hard X-ray telescope, Constellation-X, X-ray optics, segmented glass, thermally-slumped
Series Name:Proceedings of SPIE
Issue or Number:5168
Record Number:CaltechAUTHORS:20180731-114052007
Persistent URL:
Official Citation:Charles J. Hailey, Finn E. Christensen, William W. Craig, Fiona A. Harrison, Jason E. Koglin, Robert Petre, Haitao Yu, William W. Zhang, "Fabrication and performance of Constellation-X hard x-ray telescope prototype optics using segmented glass", Proc. SPIE 5168, Optics for EUV, X-Ray, and Gamma-Ray Astronomy, (29 January 2004); doi: 10.1117/12.506334;
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:88379
Deposited By: George Porter
Deposited On:31 Jul 2018 20:35
Last Modified:16 Nov 2021 00:26

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