5 June 2018 Optical design for the Giant Magellan Telescope Multi-object Astronomical and Cosmological Spectrograph (GMACS): design methodology, issues, and trade-offs
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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, Rafael A.S. Ribeiro, Damein Jones, Damein Jones, Luke M. Schmidt, Luke M. Schmidt, Keith Taylor, Keith Taylor, Erika Cook, Erika Cook, Darren L. DePoy, Darren L. DePoy, Daniel Faes, Daniel Faes, Cynthia Froning, Cynthia Froning, Tae-Geun Ji, Tae-Geun Ji, Hye-In Lee, Hye-In Lee, Jennifer L. Marshall, Jennifer L. Marshall, Claudia Mendes de Oliveira, Claudia Mendes de Oliveira, Soojong Pak, Soojong Pak, Casey Papovich, Casey Papovich, Travis Prochaska, Travis Prochaska, Aline Souza, 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); doi: 10.1117/12.2313528; https://doi.org/10.1117/12.2313528
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