17 September 2012 Repairing stress induced cracks in the Keck primary mirror segments
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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.
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Dennis McBride, John S. Hudek, 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); doi: 10.1117/12.926566; https://doi.org/10.1117/12.926566
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