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The optical design for the Giant Magellan Telescope Multi-object Astronomical and Cosmological Spectrograph (GMACS)
Author(s): Rafael A.S. Ribeiro; Luke M. Schmidt; Damien Jones; Keith Taylor; Travis Prochaska; Erika Cook; Darren L. DePoy; Daniel Faes; Cynthia Froning; Tae-Geun Ji; Hye-In Lee; Jennifer L. Marshall; Claudia Mendes de Oliveira; Soojong Pak; Casey Papovich; Aline Souza
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Paper Abstract

We describe the optical design of GMACS, a multi-object wide field optical spectrograph currently being developed for the Giant Magellan Telescope (GMT). Optical spectrographs for the emerging generation of Extreme Large Telescopes (ELTs) have unique design issues. For example, the combination of both the largest field of view practical and beam widths achieving the desired spectral resolutions force the design of seeing limited ELT optical spectrographs to include large refractive elements, which in turn requires a compromise between the optical performance, manufacturability, and operability. We outline the details of the GMACS optical design subsystems, their individual and combined optical performance, and the preliminary flexure tolerances. Updates to the detector specifications, field acquisition/alignment optics, and optical considerations for active flexure control are also discussed. The resulting design meets the technical instrument requirements generated from the GMACS science requirements, is expected to satisfy the available project budget, and has an acceptable level of risk for the subsystem manufacture and assembly.

Paper Details

Date Published: 12 July 2018
PDF: 13 pages
Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 107029B (12 July 2018); doi: 10.1117/12.2312814
Show Author Affiliations
Rafael A.S. Ribeiro, Univ. de São Paulo (Brazil)
Luke M. Schmidt, Texas A&M Univ. (United States)
Damien Jones, Prime Optics (Australia)
Keith Taylor, Instruments4 (United States)
Travis Prochaska, Texas A&M Univ. (United States)
Erika Cook, Texas A&M Univ. (United States)
Darren L. DePoy, Texas A&M Univ. (United States)
Daniel Faes, Univ. de São Paulo (Brazil)
Cynthia Froning, Texas A&M Univ. (United States)
Tae-Geun Ji, Kyung Hee Univ. (Korea, Republic of)
Hye-In Lee, Kyung Hee Univ. (Korea, Republic of)
Jennifer L. Marshall, Texas A&M Univ. (United States)
Claudia Mendes de Oliveira, Univ. de São Paulo (Brazil)
Soojong Pak, Kyung Hee Univ. (Korea, Republic of)
Casey Papovich, Texas A&M Univ. (United States)
Aline Souza, Univ. de São Paulo (Brazil)

Published in SPIE Proceedings Vol. 10702:
Ground-based and Airborne Instrumentation for Astronomy VII
Christopher J. Evans; Luc Simard; Hideki Takami, Editor(s)

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