LSST Telescope and Site Overview and Update

Details LSST Telescope and Site Overview and Update LSST Telescope and Site Overview and Update

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21346023k&link_type=abstract

American Astronomical Society, AAS Meeting #213, #460.23; Bulletin of the American Astronomical Society, Vol. 41, p.370

Physics

Optics

Scientific paper

Design of the Telescope and Site system for LSST is advancing to preliminary design and fabrication of all the mirrors for the system has begun. The telescope system is designed to contribute 0.25 arc sec FWHM to the overall system image quality error budget (0.35 arc sec). Keys to meeting this budget are the three mirrors and an active optics control system. The active optics control system has been prototyped with curvature wavefront sensing measurements at four focal plan locations and reconstruction algorithms to drive the degrees of freedom in the mirror systems and maintain alignment of the camera. The primary-tertiary monolithic mirror is being fabricated at the Steward Observatory Mirror Lab using their structured borosilicate spin casting technology. The secondary mirror substrate is being fabricated at Corning Incorporated using their ULETM thin meniscus mirror technology. The telescope mount and optical support structure is compact, stiff, and agile to maximize observing efficiency achieving a simulated 10 year survey with over 2 ½ million fields visited. Hydrostatic bearings to support the 300 ton telescope structure while maintaining a first mode frequency of more than 8Hz have been identified. Adjustments to the dome and facility design have been made for improved performance, operations, and maintenance and site civil engineering has been completed to determine excavation plans for the site.

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