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Proceedings Paper

Pre-construction of giant steerable science mirror for TMT
Author(s): Fei Yang; Hongchao Zhao; Peng Guo; Qichang An; Haibo Jiang
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Paper 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.

Paper Details

Date Published: 2 September 2015
PDF: 12 pages
Proc. SPIE 9573, Optomechanical Engineering 2015, 95730T (2 September 2015); doi: 10.1117/12.2185507
Show Author Affiliations
Fei Yang, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Hongchao Zhao, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Peng Guo, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Qichang An, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Haibo Jiang, Changchun Institute of Optics, Fine Mechanics and Physics (China)


Published in SPIE Proceedings Vol. 9573:
Optomechanical Engineering 2015
Alson E. Hatheway, Editor(s)

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