Testing and status of the LSST hexapods and rotator

Ryan Sneed; Douglas R. Neill; Brendan Caldwell; Bryan Walter; Harini Sundararaman; Mike Warner

doi:10.1117/12.2311500

6 July 2018 Testing and status of the LSST hexapods and rotator

Ryan Sneed, Douglas R. Neill, Brendan Caldwell, Bryan Walter, Harini Sundararaman, Mike Warner

Proceedings Volume 10700, Ground-based and Airborne Telescopes VII; 1070039 (2018) https://doi.org/10.1117/12.2311500
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

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 hexapods and rotator have been designed, fabricated, assembled, and are currently being tested by Moog CSA. An update on these activities is provided along with a detailed discussion of the testing approach and results ranging from proof load and life testing to positioning performance. Particular emphasis is given to testing of the positioning accuracy, repeatability, and resolution of the hexapods and tracking accuracy and runout of the rotator. Verification of power off braking, heat dissipation, settling time, range of motion, and velocity requirements are also presented.

Citation Download Citation

Ryan Sneed, Douglas R. Neill, Brendan Caldwell, Bryan Walter, Harini Sundararaman, and Mike Warner "Testing and status of the LSST hexapods and rotator", Proc. SPIE 10700, Ground-based and Airborne Telescopes VII, 1070039 (6 July 2018); https://doi.org/10.1117/12.2311500

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