27 June 2006 Tomagraphic wavefront correction for the LSST
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Abstract
The Large Synoptic Survey Telescope (LSST) is a three mirror modified Paul-Baker design with an 8.4m primary, a 3.4m secondary, and a 5.0m tertiary followed by a 3-element refractive corrector producing a 3.5 degree field of view. This design produces image diameters of <0.3 arcsecond 80% encircled energy over its full field of view. The image quality of this design is sufficient to ensure that the final images produced by the telescope will be limited by the atmospheric seeing at an excellent astronomical site. In order to maintain this image quality, the deformations and rigid body motions of the three large mirrors must be actively controlled to minimize optical aberrations. By measuring the optical wavefront produced by the telescope at multiple points in the field, mirror deformations and rigid body motions that produce a good optical wavefront across the entire field may be determined. We will describe the details of the techniques for obtaining these solutions. We will show that, for the expected mirror deformations and rigid body misalignments, the solutions that are found using these techniques produce an image quality over the field that is close to optimal. We will discuss how many wavefront sensors are needed and the tradeoffs between the number of wavefront sensors, their layout and noise sensitivity.
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Donald W. Phillion, Donald W. Phillion, Scot S. Olivier, Scot S. Olivier, Kevin Baker, Kevin Baker, Lynn Seppala, Lynn Seppala, Stacie Hvisc, Stacie Hvisc, } "Tomagraphic wavefront correction for the LSST", Proc. SPIE 6272, Advances in Adaptive Optics II, 627213 (27 June 2006); doi: 10.1117/12.673770; https://doi.org/10.1117/12.673770
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