9 August 2016 Damage and removal of the coating on the first lens of the MegaCam wide-field corrector
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Abstract
The coating on the exposed surface of the 810 mm diameter first element of the MegaCam wide-field corrector at the Canada-France-Hawaii Telescope (CFHT) was found to be degraded in the fall of 2014. An investigation showed that the coating was, in fact, damaged over a large part of the exposed surface and was causing major scattering, severely degrading the performance of the instrument. The coating was subsequently removed from the lens by CFHT, restoring the majority of the instrument performance. The investigation of the degradation and the procedure used to remove the coating will be described in this paper.
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Gregory Barrick, Tom Benedict, Derrick Salmon, "Damage and removal of the coating on the first lens of the MegaCam wide-field corrector", Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 99082P (9 August 2016); doi: 10.1117/12.2233045; https://doi.org/10.1117/12.2233045
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