Optical design for the Giant Magellan Telescope Multi-object Astronomical and Cosmological Spectrograph (GMACS): design methodology, issues, and trade-offs

Rafael A.S. Ribeiro; Damein Jones; Luke M. Schmidt; Keith Taylor; 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; Travis Prochaska; Aline Souza

doi:10.1117/12.2313528

5 June 2018 Optical design for the Giant Magellan Telescope Multi-object Astronomical and Cosmological Spectrograph (GMACS): design methodology, issues, and trade-offs

Rafael A.S. Ribeiro, Damein Jones, Luke M. Schmidt, Keith Taylor, 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, Travis Prochaska, Aline Souza

Author Affiliations +

Proceedings Volume 10690, Optical Design and Engineering VII; 106902S (2018) https://doi.org/10.1117/12.2313528
Event: SPIE Optical Systems Design, 2018, Frankfurt, Germany

Abstract

We present the current optical design of GMACS, a multi-object wide field optical spectrograph currently being developed for the Giant Magellan Telescope, a member of the emerging generation of Extremely Large Telescopes (ELTs). Optical spectrographs for ELTs have unique design challenges and issues. For example, the combination of the largest practical field of view and beam widths necessary to achieve the desired spectral resolutions force the design of seeing limited ELT optical spectrographs to include aspheric lenses, broadband dichroics, and volume phase holographic gratings - all necessarily very large. We here outline details of the collimator and camera subsystems, the design methodology and trade-off analyses used to develop the collimator subsystem, the individual and combined subsystem performances and the predicted tolerances.

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Rafael A.S. Ribeiro, Damein Jones, Luke M. Schmidt, Keith Taylor, 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, Travis Prochaska, and Aline Souza "Optical design for the Giant Magellan Telescope Multi-object Astronomical and Cosmological Spectrograph (GMACS): design methodology, issues, and trade-offs", Proc. SPIE 10690, Optical Design and Engineering VII, 106902S (5 June 2018); https://doi.org/10.1117/12.2313528

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KEYWORDS

Collimators

Cameras

Spectrographs

Glasses

Telescopes

Optical design

Spectral resolution

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