Design of Pocket-GMT: an optical emulation of the Giant Magellan Telescope

Josephine Munro; Marcus Lingham; Luke Gers; Nicholas Herrald; Tony Travouillon; Antonin Bouchez

doi:10.1007/s10686-020-09674-9

Design of Pocket-GMT: an optical emulation of the Giant Magellan Telescope

Josephine Munro^*, Marcus Lingham, Luke Gers, Nicholas Herrald, Tony Travouillon, Antonin Bouchez

^*Corresponding author for this work

Advanced Instrumentation and Technology Centre

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Abstract

The concept design for a laboratory based telescope emulator for the Giant Magellan Telescope (GMT) is described here. The Giant Magellan Telescope has a primary mirror comprised of 7 segments, and a secondary mirror with matching segmentation. The phasing of the GMT is a complex problem; a phasing testbed, Pocket-GMT, has been designed by a group within the Research School of Astronomy and Astrophysics at the Australian National University for the Giant Magellan Telescope Corporation. Pocket-GMT uses a novel technique to split the bending modes between a piston/tip-tilt surface and a deformable mirror. Pocket-GMT will demonstrate successful phasing of an optical miniature GMT by the planned prototype wavefront sensing systems. By reproducing the optical characteristics of the GMT on a small scale, Pocket-GMT will reduce the risk associated with the phasing system and provide a platform to test the telescopeFLs instrumentation prior to commissioning.

Original language	English
Pages (from-to)	289-302
Number of pages	14
Journal	Experimental Astronomy
Volume	50
Issue number	2-3
DOIs	https://doi.org/10.1007/s10686-020-09674-9
Publication status	Published - 1 Dec 2020

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abstract = "The concept design for a laboratory based telescope emulator for the Giant Magellan Telescope (GMT) is described here. The Giant Magellan Telescope has a primary mirror comprised of 7 segments, and a secondary mirror with matching segmentation. The phasing of the GMT is a complex problem; a phasing testbed, Pocket-GMT, has been designed by a group within the Research School of Astronomy and Astrophysics at the Australian National University for the Giant Magellan Telescope Corporation. Pocket-GMT uses a novel technique to split the bending modes between a piston/tip-tilt surface and a deformable mirror. Pocket-GMT will demonstrate successful phasing of an optical miniature GMT by the planned prototype wavefront sensing systems. By reproducing the optical characteristics of the GMT on a small scale, Pocket-GMT will reduce the risk associated with the phasing system and provide a platform to test the telescopeFLs instrumentation prior to commissioning.",

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AU - Bouchez, Antonin

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Design of Pocket-GMT: an optical emulation of the Giant Magellan Telescope

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