Forming mandrels for x-ray telescopes made of modified Zerodur

Thorsten Doehring; Ralf Jedamzik; Peter Hartmann; Hauke Esemann; Clemens Kunisch

doi:10.1117/12.505567

29 January 2004 Forming mandrels for x-ray telescopes made of modified Zerodur

Thorsten Doehring, Ralf Jedamzik, Peter Hartmann, Hauke Esemann, Clemens Kunisch

Proceedings Volume 5168, Optics for EUV, X-Ray, and Gamma-Ray Astronomy; (2004) https://doi.org/10.1117/12.505567
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

Abstract

For the next generation of X-ray observatories (CONSTELLATION-X and XEUS) a mass production of glass mirror segments is considered. The mirror substrates (SCHOTT D263 and SCHOTT BOROFLOAT 33) will be pre-shaped in a high temperature slumping process by use of precision forming mandrels. SCHOTT GLAS developed the glass ceramic material ZERODUR K20 to meet the requirements of these mandrels. The new material is a modification of the well-known ZERODUR. A heat driven transformation thereby changes the crystalline phase from high-quartz to keatite structure. The resulting ZERODUR K20 exhibits an increased stability at high temperatures of up to 850°C and a low thermal expansion coefficient (CTE) of approximately 20•10^-7 K^-1 (20°-700°C). Numerical simulations of the slumping process based on experimental parameters of Zerodur K20 and the mirror substrate materials are presented.

Citation Download Citation

Thorsten Doehring, Ralf Jedamzik, Peter Hartmann, Hauke Esemann, and Clemens Kunisch "Forming mandrels for x-ray telescopes made of modified Zerodur", Proc. SPIE 5168, Optics for EUV, X-Ray, and Gamma-Ray Astronomy, (29 January 2004); https://doi.org/10.1117/12.505567

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