Performance and Analysis of the LSST Optical System

Details Performance and Analysis of the LSST Optical System Performance and Analysis of the LSST Optical System

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21113718c&link_type=abstract

American Astronomical Society, AAS Meeting #211, #137.18; Bulletin of the American Astronomical Society, Vol. 39, p.981

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Scientific paper

The LSST uses a modified Paul-Baker 3-mirror optical design with 8.4-m primary, 3.4-m secondary and 5-m tertiary mirrors. The system prescription has evolved to enable its deep, wide, fast mission. The proximity of the primary and tertiary surfaces enables fabrication of both mirrors from a single substrate. This unique design, referred to as the M1M3 monolith, offers significant advantages in the reduction of degrees of freedom during operational alignment and improved structural stiffness for the otherwise annular primary surface. The 3-mirror telescope feeds a 3 element refractive corrector to produce a 3.5-degree diameter field of view over a 64-cm flat focal surface in 6 spectral bands with excellent image quality. The most recent design optimization included null tests for each of the three camera lenses and resulted in significantly simpler test configurations and reduced asphericity on the secondary mirror. Detailed analysis of the optical effects of lens displacements, gravity distortions, glass quality, and fabrication errors have been carried out and show this system to be well within industry fabrications capabilities. Stray and scattered light analysis shows the LSST will achieve its signal to noise requirements. Further progress has been made on the development of mirror, anti-reflection, and filter coatings showing that the system throughput meets the depth requirements of the survey and the out of band filter rejection requirements.

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