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Proceedings Paper

Cryogenic optical systems for the rapid infrared imager/spectrometer (RIMAS)
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Paper Abstract

The Rapid Infrared Imager/Spectrometer (RIMAS) is designed to perform follow-up observations of transient astronomical sources at near infrared (NIR) wavelengths (0.9 - 2.4 microns). In particular, RIMAS will be used to perform photometric and spectroscopic observations of gamma-ray burst (GRB) afterglows to compliment the Swift satellite’s science goals. Upon completion, RIMAS will be installed on Lowell Observatory’s 4.3 meter Discovery Channel Telescope (DCT) located in Happy Jack, Arizona. The instrument’s optical design includes a collimator lens assembly, a dichroic to divide the wavelength coverage into two optical arms (0.9 - 1.4 microns and 1.4 - 2.4 microns respectively), and a camera lens assembly for each optical arm. Because the wavelength coverage extends out to 2.4 microns, all optical elements are cooled to ~70 K. Filters and transmission gratings are located on wheels prior to each camera allowing the instrument to be quickly configured for photometry or spectroscopy. An athermal optomechanical design is being implemented to prevent lenses from loosing their room temperature alignment as the system is cooled. The thermal expansion of materials used in this design have been measured in the lab. Additionally, RIMAS has a guide camera consisting of four lenses to aid observers in passing light from target sources through spectroscopic slits. Efforts to align these optics are ongoing.

Paper Details

Date Published: 8 July 2014
PDF: 6 pages
Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 914736 (8 July 2014); doi: 10.1117/12.2055503
Show Author Affiliations
John I. Capone, Univ. of Maryland, College Park (United States)
David A. Content, NASA Goddard Space Flight Ctr. (United States)
Alexander S. Kutyrev, Univ. of Maryland, College Park (United States)
NASA Goddard Space Flight Ctr. (United States)
Frederick D. Robinson, NASA Goddard Space Flight Ctr. (United States)
Global Science and Technology, Inc. (United States)
Gennadiy N. Lotkin, NASA Goddard Space Flight Ctr. (United States)
Global Science and Technology, Inc. (United States)
Vicki L. Toy, Univ. of Maryland, College Park (United States)
Sylvain Veilleux, Univ. of Maryland, College Park (United States)
Samuel H. Moseley, NASA Goddard Space Flight Ctr. (United States)
Neil A. Gehrels, NASA Goddard Space Flight Ctr. (United States)
Stuart N. Vogel, Univ. of Maryland, College Park (United States)


Published in SPIE Proceedings Vol. 9147:
Ground-based and Airborne Instrumentation for Astronomy V
Suzanne K. Ramsay; Ian S. McLean; Hideki Takami, Editor(s)

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