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Final design of the LSST hexapods and rotator

Sneed, Ryan
Neill, Douglas R.; Kidney, Scott; Araujo, Constanza; Gressler, William; Lotz, Paul J.; Mills, Dave; Sebag, Jacques, Sebring, Thomas A.; Warner, Michael, Wiecha, Oliver
Ryan Sneed ; Douglas R. Neill ; Scott Kidney ; Constanza Araujo ; William Gressler, et al. " Final design of the LSST hexapods and rotator ", Proc. SPIE 9906, Ground-based and Airborne Telescopes VI, 99060K (July 27, 2016); doi:10.1117/12.2231327; http://dx.doi.org/10.1117/12.2231327
Publication Date: 
Wednesday, July 27, 2016
Type: 
Conference Papers
SPIE
Citable: 
no
SPIE Proceedings
Volume: 
9906
Abstract: 
The Large Synoptic Survey Telescope (LSST) is a large (8.4 meter) wide-field (3.5 degree) survey telescope, which will be located on the Cerro Pachón summit in Chile. Both the Secondary Mirror (M2) Cell Assembly and Camera utilize hexapods to facilitate optical positioning relative to the Primary/Tertiary (M1M3) Mirror. A rotator resides between the Camera and its hexapod to facilitate tracking. The final design of the hexapods and rotator has been completed by Moog CSA, who are also providing the fabrication and integration and testing. Geometric considerations preclude the use of a conventional hexapod arrangement for the M2 Hexapod. To produce a more structurally efficient configuration the camera hexapod and camera rotator will be produced as a single unit. The requirements of the M2 Hexapod and Camera Hexapod are very similar; consequently to facilitate maintainability both hexapods will utilize identical actuators. The open loop operation of the optical system imposes strict requirements on allowable hysteresis. This requires that the hexapod actuators use flexures rather than more traditional end joints. Operation of the LSST requires high natural frequencies, consequently, to reduce the mass relative to the stiffness, a unique THK rail and carriage system is utilized rather than the more traditional slew bearing. This system utilizes two concentric tracks and 18 carriages. © (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Document-21544
Reviewed Under: 
LSST Project Publication Policy
Bibtex reference: 
@proceeding{doi:10.1117/12.2231327, author = {Sneed, Ryan and Neill, Douglas R. and Kidney, Scott and Araujo, Constanza and Gressler, William and Lotz, Paul J. and Milles, Dave and Sebag, Jacques and Sebring, Thomas A. and Warner, Mickael and Wiecha, Oliver}, title = { Final design of the LSST hexapods and rotator }, journal = {Proc. SPIE}, volume = {9906}, number = {}, pages = {99060K-99060K-12}, abstract = { The Large Synoptic Survey Telescope (LSST) is a large (8.4 meter) wide-field (3.5 degree) survey telescope, which will be located on the Cerro Pachón summit in Chile. Both the Secondary Mirror (M2) Cell Assembly and Camera utilize hexapods to facilitate optical positioning relative to the Primary/Tertiary (M1M3) Mirror. A rotator resides between the Camera and its hexapod to facilitate tracking. The final design of the hexapods and rotator has been completed by Moog CSA, who are also providing the fabrication and integration and testing. Geometric considerations preclude the use of a conventional hexapod arrangement for the M2 Hexapod. To produce a more structurally efficient configuration the camera hexapod and camera rotator will be produced as a single unit. The requirements of the M2 Hexapod and Camera Hexapod are very similar; consequently to facilitate maintainability both hexapods will utilize identical actuators. The open loop operation of the optical system imposes strict requirements on allowable hysteresis. This requires that the hexapod actuators use flexures rather than more traditional end joints. Operation of the LSST requires high natural frequencies, consequently, to reduce the mass relative to the stiffness, a unique THK rail and carriage system is utilized rather than the more traditional slew bearing. This system utilizes two concentric tracks and 18 carriages. }, year = {2016}, doi = {10.1117/12.2231327}, URL = { http://dx.doi.org/10.1117/12.2231327}, eprint = {} }

Financial support for LSST 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 LSST 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 LSST camera 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 LSST in its Operations phase. They will also provide support for scientific research with LSST data.   




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