Repairing stress induced cracks in the Keck primary mirror segments

Dennis McBride; John S. Hudek; Sergey Panteleev

doi:10.1117/12.926566

17 September 2012 Repairing stress induced cracks in the Keck primary mirror segments

Dennis McBride, John S. Hudek, Sergey Panteleev

Proceedings Volume 8444, Ground-based and Airborne Telescopes IV; 844421 (2012) https://doi.org/10.1117/12.926566
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

Stress induced cracks have developed in the Zerodur glass at bonded supports for the primary mirror segments of the W.M. Keck Observatory telescopes. This has been a slow process that has advanced over the 20 year life of the telescopes. All mirror segments exhibit cracks to varying degrees. The number and severity of cracks has now reached a stage at which repairs are mandatory. A project is under way to determine the root causes of the cracks, and to develop a repair strategy. New supports and bonding methods are being designed and tested that will replace all of the original supports.

Citation Download Citation

Dennis McBride, John S. Hudek, and Sergey Panteleev "Repairing stress induced cracks in the Keck primary mirror segments", Proc. SPIE 8444, Ground-based and Airborne Telescopes IV, 844421 (17 September 2012); https://doi.org/10.1117/12.926566

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