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Proceedings Paper

GMTNIRS (Giant Magellan Telescope Near-Infrared Spectrograph): structural-mechanical design
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Paper Abstract

A near-infrared spectrograph (NIRS) has been designed and proposed for utilization as a first-light instrument on the Giant Magellan Telescope (GMT). GMTNIRS includes modular JHK, LM spectrograph units mounted to two sides of a cryogenic optical bench. The optical bench and surrounding, protective radiation (thermal) shield are containerized within a rigid cryostat vessel, which mounts to the GMT instrument platform. A support structure on the secondary side of the optical bench provides multi-dimensional stiffness to the optical bench, to prevent excessive displacements of the optical components during tracking of the telescope. Extensive mechanical simulation and optimization was utilized to arrive at synergistic designs of the optical bench, support structure, cryostat, and thermal isolation system. Additionally, detailed steady-state and transient thermal analyses were conducted to optimize and verify the mechanical designs to maximize thermal efficiency and to size cryogenic coolers and conductors. This paper explains the mechanical and thermal design points stemming from optical component placement and mounting and structural and thermal characteristics needed to achieve instrument science requirements. The thermal and mechanical simulations will be described and the data will be summarized. Sufficient details of the analyses and data will be provided to validate the design decisions.

Paper Details

Date Published: 24 September 2012
PDF: 17 pages
Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 844669 (24 September 2012); doi: 10.1117/12.927022
Show Author Affiliations
Timothy A. Beets, The Univ. of Texas at Austin (United States)
Joseph H. Beno, The Univ. of Texas at Austin (United States)
Moo-Young Chun, Korea Astronomy and Space Science Institute (Korea, Republic of)
Sungho Lee, Korea Astronomy and Space Science Institute (Korea, Republic of)
Chan Park, Korea Astronomy and Space Science Institute (Korea, Republic of)
Marc Rafal, McDonald Observatory, Univ. of Texas (United States)
Michael S. Worthington, The Univ. of Texas at Austin (United States)
In-Soo Yuk, Korea Astronomy and Space Science Institute (Korea, Republic of)


Published in SPIE Proceedings Vol. 8446:
Ground-based and Airborne Instrumentation for Astronomy IV
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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