29 January 2004 Fabrication and performance of Constellation-X hard x-ray telescope prototype optics using segmented glass
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Abstract
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".
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Charles J. Hailey, Charles J. Hailey, Finn E. Christensen, Finn E. Christensen, William W. Craig, William W. Craig, Fiona A. Harrison, Fiona A. Harrison, Jason E. Koglin, Jason E. Koglin, Robert Petre, Robert Petre, Haitao Yu, Haitao Yu, William W. Zhang, 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; https://doi.org/10.1117/12.506334
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