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M1/M3 - It's Two Mirrors in One!

Clearly visible in this mid-June 2012 photograph are the dual optical surfaces in the LSST M1/M3 mirror blank. The steeper 5.0-meter diameter M3 surface, with its short radius of curvature, descends toward the center while the outer 8.4-meter diameter M1 surface sweeps outward to the edge of the substrate. Generation of both the M1 and M3 figure is now completed, with nearly 5 tons of glass removed to achieve the required approximate shape before polishing can begin. Laser tracker measurements confirm that the primary and tertiary surfaces are located properly with respect to each other. Next polishing actuators and thermocouples will be installed on the polishing cell for precision polishing of the front surface. The M1/M3 dual surfaces are scheduled to be complete in January 2012. Shown L-R: S. Jacoby, C. Claver, S. Wolff, V. Krabbendam, J. Schaefer.
E. Acosta / LSST Corporation

Financial support for Rubin Observatory comes from the National Science Foundation (NSF) through Cooperative Agreement No. 1258333, the Department of Energy (DOE) Office of Science under Contract No. DE-AC02-76SF00515, and private funding raised by the LSST Corporation. The NSF-funded Rubin Observatory Project Office for construction was established as an operating center under management of the Association of Universities for Research in Astronomy (AURA).  The DOE-funded effort to build the Rubin Observatory LSST Camera (LSSTCam) is managed by the SLAC National Accelerator Laboratory (SLAC).
The National Science Foundation (NSF) is an independent federal agency created by Congress in 1950 to promote the progress of science. NSF supports basic research and people to create knowledge that transforms the future.
NSF and DOE will continue to support Rubin Observatory in its Operations phase. They will also provide support for scientific research with LSST data.   

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