GMTNIRS: preliminary optical mount design for cryogenic spectrograph

Woojin Park; Sanghyuk Kim; Chan Park; Sungho Lee; Hanshin Lee; John Good; Heeyoung Oh; Gregory Mace; Cynthia Brooks; Ueejeong Jeong; Moo-Young Chun; Alycia J. Weinberger; Daniel T. Jaffe

doi:10.1117/12.2628408

29 August 2022 GMTNIRS: preliminary optical mount design for cryogenic spectrograph

Woojin Park, Sanghyuk Kim, Chan Park, Sungho Lee, Hanshin Lee, John Good, Heeyoung Oh, Gregory Mace, Cynthia Brooks, Ueejeong Jeong, Moo-Young Chun, Alycia J. Weinberger, Daniel T. Jaffe

Author Affiliations +

Proceedings Volume 12184, Ground-based and Airborne Instrumentation for Astronomy IX; 121842Q (2022) https://doi.org/10.1117/12.2628408
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

GMTNIRS, the first-generation instrument of the Giant Magellan Telescope, is a high-resolution (R = 65,000 – 80,000) near-infrared spectrograph. We introduce the preliminary design of optical mounts for slit, beam splitters, mirrors, and gratings installed in the cryogenic spectrograph. Optical components are mounted on aluminum structures and fixed by titanium springs and spring plungers. Static analysis of optical mounts with 1g-force at various directions has been performed to verify the stability of the optical system. In addition, stability in the seismic environment is evaluated with modal analysis and non-linear dynamic analysis. Design and simulation results are compared to the tolerance limits of the system.

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Woojin Park, Sanghyuk Kim, Chan Park, Sungho Lee, Hanshin Lee, John Good, Heeyoung Oh, Gregory Mace, Cynthia Brooks, Ueejeong Jeong, Moo-Young Chun, Alycia J. Weinberger, and Daniel T. Jaffe "GMTNIRS: preliminary optical mount design for cryogenic spectrograph", Proc. SPIE 12184, Ground-based and Airborne Instrumentation for Astronomy IX, 121842Q (29 August 2022); https://doi.org/10.1117/12.2628408

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