31 August 2009 A stainless-steel mandrel for slumping glass x-ray mirrors
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Abstract
We have fabricated a precision full-cylinder stainless-steel mandrel at NASA Marshall Space Flight Center. The mandrel is figured for a 30-cm-diameter primary (paraboloid) mirror of an 840-cm focal-length Wolter-1 telescope. We have developed this mandrel for experiments in slumping-thermal forming at about 600°C-of glass mirror segments at NASA Goddard Space Flight Center, in support of NASA's participation in the International X-ray Observatory (IXO). Precision turning of stainless-steel mandrels may offer a low-cost alternative to conventional figuring of fusedsilica or other glassy forming mandrels. We report on the fabrication, metrology, and performance of this first mandrel; then we discuss plans and goals for stainless-steel mandrel technology.
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Mikhail V. Gubarev, Stephen L. O'Dell, William D. Jones, Thomas J. Kester, Charles W. Griffith, William W. Zhang, Timo T. Saha, Kai-Wing Chan, "A stainless-steel mandrel for slumping glass x-ray mirrors", Proc. SPIE 7437, Optics for EUV, X-Ray, and Gamma-Ray Astronomy IV, 74370Z (31 August 2009); doi: 10.1117/12.831260; https://doi.org/10.1117/12.831260
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