GMT adaptive secondary mirror positioner model and testing

Peter M. Thompson; Frank Groark; Hugo Chiquito; Glenn Brossus; Daniele Gallieni; Roberto Biasi; Matteo Tintori; Mauro Manetti; Pierluigi Fumi; Francesco Leonardi

doi:10.1117/12.3020610

28 August 2024 GMT adaptive secondary mirror positioner model and testing

Peter M. Thompson, Frank Groark, Hugo Chiquito, Glenn Brossus, Daniele Gallieni, Roberto Biasi, Matteo Tintori, Mauro Manetti, Pierluigi Fumi, Francesco Leonardi

Author Affiliations +

Proceedings Volume 13097, Adaptive Optics Systems IX; 130974V (2024) https://doi.org/10.1117/12.3020610
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

The Giant Magellan Telescope has a seven-segment Adaptive Secondary Mirror (ASM) System that must meet stringent surface error performance requirements while tracking and offloading. The first hexapod of the M2 Positioner has been constructed and tested by AdOptica using an attocube-based laser truss as a truth sensor. Modeling, analysis, test results are presented, including an actuator model, control structure interaction analysis, attocube sensor and actuator noise models, modal identification, and performance measurements. The test results show that the 10nm RMS surface error requirement due to actuator-based noise sources is verified.

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Peter M. Thompson, Frank Groark, Hugo Chiquito, Glenn Brossus, Daniele Gallieni, Roberto Biasi, Matteo Tintori, Mauro Manetti, Pierluigi Fumi, and Francesco Leonardi "GMT adaptive secondary mirror positioner model and testing", Proc. SPIE 13097, Adaptive Optics Systems IX, 130974V (28 August 2024); https://doi.org/10.1117/12.3020610

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