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3 January 2020 Design concept for Pocket-GMT
M. Lingham, A. Bouchez, L. Gers, N. Herrald, J. Munro, T. Travouillon
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Proceedings Volume 11203, Advances in Optical Astronomical Instrumentation 2019; 112030D (2020) https://doi.org/10.1117/12.2539922
Event: ANZCOP, 2019, Melbourne, Australia
Abstract
One of the main challenges for the new generation of extremely large telescopes (ELT) such as the Giant Magellan Telescope (GMT) is apparent in their ability to phase the segments in their primary mirror. Due to the lack of viability of manufacturing enormous mirrors, these primary mirrors are composed of smaller segments, and therefore they must be phased. Prior to the full construction of GMT, there has been proposal to develop a small-scale laboratory testbed to reproduce elements of GMT’s design, major disturbances, and control systems. This would serve to reduce the risk in cost and time prior to commissioning.
The team at the Australian National University’s (ANU) Research School of Astronomy and Astrophysics (RSAA) have developed a design concept for such a miniature version, coined Pocket-GMT. Pocket-GMT is designed to simulate GMT’s segmented primary mirror as well as introduce aberrations and distortions similar to what GMT will experience. This would present an opportunity to optimize the functionality of GMT’s control software and wavefront sensors, and to demonstrate phasing within the laboratory prior to full-scale telescope implementation. Pocket-GMT would also be compatible with later GMT instrument prototypes, thus ensuring its usefulness going into the future.
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M. Lingham, A. Bouchez, L. Gers, N. Herrald, J. Munro, and T. Travouillon "Design concept for Pocket-GMT", Proc. SPIE 11203, Advances in Optical Astronomical Instrumentation 2019, 112030D (3 January 2020); https://doi.org/10.1117/12.2539922
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KEYWORDS
Mirrors
Telescopes
Control systems design
Metrology
Wavefront sensors
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