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- W2023161642 abstract "The Large Synoptic Survey Telescope (LSST) is an 8.4 meter telescope with a field of view of 10 squaredegrees. This telescope will be capable of mapping the entire visible sky every few nights via sequential 15-second exposures, opening new windows on the universe from dark energy to time variable objects. TheLSST optics calls for an annular 3.5 m diameter Secondary Mirror (M2), which is a large meniscus convexasphere (ellipse). The M2 converts the beam reflected from the f/1.2 primary mirror into a beam for the f/0.83Tertiary Mirror (M3). The M2 has a mass of approximately 1.5 metric tons and the mirror support system willneed to maintain the mirror figure at different gravity orientations. The optical performance evaluations weremade based on the optimized support systems consisting of 72 axial supports, mounted at the mirror backsurface, and 6 tangent link lateral supports mounted around the outer edge. The predicted print-though errorsof the M2 supports are 8nm RMS surface for axial gravity and 10nm RMS surface for lateral gravity. Thenatural frequencies were calculated for the M2 dynamic performance. In addition, thermo-elastic analyses ofM2 for thermal gradient cases were conducted. The LSST M2 support system has an active optics capabilityto maintain optical figure and its performance to correct low-order aberrations has been demonstrated. Theoptical image qualities and structure functions for the axial and lateral gravity print-through cases, andthermal gradient effects were calculated." @default.
- W2023161642 created "2016-06-24" @default.
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- W2023161642 date "2009-08-20" @default.
- W2023161642 modified "2023-09-22" @default.
- W2023161642 title "Performance prediction of the LSST secondary mirror" @default.
- W2023161642 cites W2008456332 @default.
- W2023161642 doi "https://doi.org/10.1117/12.823716" @default.
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