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Proceedings Paper

Repairing stress induced cracks in the Keck primary mirror segments
Author(s): Dennis McBride; John S. Hudek; Sergey Panteleev
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Paper 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.

Paper Details

Date Published: 17 September 2012
PDF: 14 pages
Proc. SPIE 8444, Ground-based and Airborne Telescopes IV, 844421 (17 September 2012); doi: 10.1117/12.926566
Show Author Affiliations
Dennis McBride, W.M. Keck Observatory (United States)
John S. Hudek, W.M. Keck Observatory (United States)
Sergey Panteleev, W.M. Keck Observatory (United States)

Published in SPIE Proceedings Vol. 8444:
Ground-based and Airborne Telescopes IV
Larry M. Stepp; Roberto Gilmozzi; Helen J. Hall, Editor(s)

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