GMT ASM overview and status

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

doi:10.1117/12.3020597

27 August 2024 GMT ASM overview and status

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

Author Affiliations +

Proceedings Volume 13097, Adaptive Optics Systems IX; 130972N (2024) https://doi.org/10.1117/12.3020597
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Abstract

The 25.4m diameter Giant Magellan Telescope utilizes a segmented adaptive secondary mirror subsystem (ASMS) for correction of atmospheric wavefront error (r0=7cm), wind-induced telescope vibrations up to 17m/s wind speed, and M1 and M2 segment alignment errors. The ASMS is composed of seven ASM segments. Each is a 1.05m diameter concave circular segment with a 2mm thick face sheet that is driven by 675 voice coil motor motors to provide wave front and phasing control. The face sheet surface figure can be updated at up to 2kHz with a -3dB bandwidth greater than 800Hz. The ASMS is integrated to the top end of the telescope by actively controlled 6 DOF hexapods. Each hexapod provides 7Hz position control to maintain the alignment within the capture range of the wave front control system. The first off-axis ASM segment is currently being manufactured by the AdOptica Consortium and their subcontractors. The Zerodur Reference Body, Zerodur face sheet, and major structural components have been manufactured and integrated. Structural and dynamic testing of the ASM primary load path has been completed. A phasing testbed is in the build stage that utilizes the single ASM segment, edge sensors, and a reference frame to simulate the phasing of an array of 4 ASM segments. This document presents an overview of the ASMS design and the results of the manufacturing, assembly and testing of the first ASM segment.

Conference Presentation

Citation Download Citation

Frank Groark, Peter Thompson, Hugo Chiquito, Glenn Brossus, John Spanos, Daniele Gallieni, Roberto Biasi, Matteo Tintori, Mauro Manetti, Pierluigi Fumi, and Francesco Leonardi "GMT ASM overview and status", Proc. SPIE 13097, Adaptive Optics Systems IX, 130972N (27 August 2024); https://doi.org/10.1117/12.3020597

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

;

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE