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25 September 2012 Wind responses of the LSST secondary mirror
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Abstract
The Large Synoptic Survey Telescope (LSST) optical design calls for a large annular 3.4 m diameter meniscus convex aspheric Secondary Mirror (M2). The M2 has a mass of approximately 1.5 metric tons and the optimized mirror support system consists of 72 axial actuators, mounted at the mirror back surface, and 6 tangent link lateral supports mounted around the outer edge. A fully integrated M2 Finite Element Model (FEM) including the mirror and the support systems has been developed to investigate the performance of the M2 assembly and to determine the image degradation due to dynamic wind loading. Detailed wind response analysis was performed based on the input from Computational Fluid Dynamics (CFD) simulations. Image quality calculations of the time history responses and Power Spectrum Density (PSD) are addressed.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Myung K. Cho, Konstantinos Vogiatzis, Jacques Sebag, and Douglas R. Neill "Wind responses of the LSST secondary mirror", Proc. SPIE 8449, Modeling, Systems Engineering, and Project Management for Astronomy V, 844905 (25 September 2012); https://doi.org/10.1117/12.926649
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