LSST Telescope and Optics Status

Computer Science – Performance

Scientific paper

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Scientific paper

Progress continues on the final design of key elements of the LSST Telescope system thanks to private support. Rear surface polishing of the unique 8.4m M1/M3 monolithic mirror has been completed with the subsequent attachment of support loadspreaders and hardpoints. The mirror will now undergo the final two year planned effort of front surface grinding and polishing. The LSST telescope cell design has matured to accommodate on-telescope mirror support, pointing, and thermal conditioning requirements in addition to off-telescope optical coating requirements. Performance and environmental testing of hardware components has commenced to assist with prototyping and final design selection of the M1/M3 mirror support system. LSST plans to design, fabricate, assemble, and deliver qualified subassemblies for integration of the M1/M3 and telescope cell in early 2012. Corning has completed and delivered the M2 ULE™ substrate. This 3.5m diameter, 100mm thick meniscus substrate has been acid etched to passivate any stress features and the convex surface has been finished via precision contour grinding to near net final shape. The substrate awaits construction funding to enable final optical polishing. The LSST Calibration System design utilizes a fiber-fed reflective projector system. An array of these projectors provides uniform illumination across the telescope field of view in tunable wavelength bands to calibrate the LSST camera detector elements. Finally, advancement continues forward on LSST support facility development via the award of an A&E contract to provide specific site design and development activities.

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