The optical design for the Giant Magellan Telescope Multi-object Astronomical and Cosmological Spectrograph (GMACS)

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

doi:10.1117/12.2312814

12 July 2018 The optical design for the Giant Magellan Telescope Multi-object Astronomical and Cosmological Spectrograph (GMACS)

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

Author Affiliations +

Proceedings Volume 10702, Ground-based and Airborne Instrumentation for Astronomy VII; 107029B (2018) https://doi.org/10.1117/12.2312814
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

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.

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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, and Aline Souza "The optical design for the Giant Magellan Telescope Multi-object Astronomical and Cosmological Spectrograph (GMACS)", Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 107029B (12 July 2018); https://doi.org/10.1117/12.2312814

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KEYWORDS

Cameras

Collimators

Spectrographs

Sensors

Telescopes

Optical design

Mirrors

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