Pre-construction of giant steerable science mirror for TMT

Fei Yang; Hongchao Zhao; Peng Guo; Qichang An; Haibo Jiang

doi:10.1117/12.2185507

2 September 2015 Pre-construction of giant steerable science mirror for TMT

Fei Yang, Hongchao Zhao, Peng Guo, Qichang An, Haibo Jiang

Proceedings Volume 9573, Optomechanical Engineering 2015; 95730T (2015) https://doi.org/10.1117/12.2185507
Event: SPIE Optical Engineering + Applications, 2015, San Diego, California, United States

Abstract

The Changchun Institute of Optics, Fine Mechanics and Physics (CIOMP) team is developing the Giant Steerable Science Mirror (GSSM) for Thirty Meter Telescope (TMT) which will get into the preliminary design phase in 2016. To develop the passive support structure system for the largest elliptic-plan flat mirror and smoothest tracking mechanism for the gravity-invariant condition, CIOMP is designing and building a 1/4 scale, functionally accurate version of the GSSM prototype. The prototype will incorporate the same optical-mechanical system and electric control system as the GSSM. The size of the prototype mirror is 898.5mm×634mm×12.5mm with elliptic-plan figure and will be supported by 18 points whiffletree on axial and 12 points whiffletree on lateral. The mirror surface figure will be evaluated by SlopeRMS which is the final evaluation method used in the actual GSSM. The prototype allows the mirror point to and be tested in five specified gravity orientations and meet the requirements of SlopeRMS. The prototype testing platform will have the interfaces with direct drive systems. The jitter testing will be implemented on the prototype system to verify the bearing, the encoder, the servo control algorithm in the low speed up to 5 arcsecond per second. The total prototype system configured mirror surface figure will be better than 1 micro radian SlopeRMS in each tested orientation. The positioner jitter will be less than 0.1 arcsecond RMS for tilt and rotator axis respectively and will be analyzed with frequency domain to meet the requirements of the TMT adaptive optics system. The pre-construction will be completed at the beginning of 2016 and provide the technical support to the preliminary design of GSSM.

Citation Download Citation

Fei Yang, Hongchao Zhao, Peng Guo, Qichang An, and Haibo Jiang "Pre-construction of giant steerable science mirror for TMT", Proc. SPIE 9573, Optomechanical Engineering 2015, 95730T (2 September 2015); https://doi.org/10.1117/12.2185507

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