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17 September 2012 Repairing stress induced cracks in the Keck primary mirror segments
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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.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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);


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