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Proceedings Paper

APOGEE cryostat design
Author(s): Basil Blank; Chuck Henderson; John C. Wilson; Fred R. Hearty; Michael F. Skrutskie; Thomas P. O'Brien; Steven R. Majewski; Ricardo Schiavon; Paul Maseman; Sophia Brunner; Adam Burton; Eric Walker
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Paper Abstract

The Apache Point Observatory Galactic Evolution Experiment (APOGEE) is a survey of all Galactic stellar populations that will employ an R=30,000 spectrograph operating in the near-infrared (1.5-1.7μm) wavelength range. The fiber-fed spectrograph is housed in a large (1.4m x 2.3m x 1.3m) stainless steel cryostat or Dewar that is LN2-cooled and will be located in a building near the 2.5m Sloan Digital Sky Survey (SDSS) telescope to which it will be coupled. The choice of shell material and configuration was an optimization among optics packaging, weight, strength, external dimensions, rigging and transportation, the available integration and testing room, and the ultimate instrument room at APO. Internals are fabricated of more traditional 6061-T6 aluminum which is well proven in cryogenic applications. An active thermal shield with MLI blanketing yields an extremely low thermal load of 45-50 watts for this ~3000 liter instrument. Cryostat design details are discussed with applicable constraints and trade decisions. APOGEE is one of four experiments that are part of Sloan Digital Sky Survey III (SDSS-III).

Paper Details

Date Published: 20 July 2010
PDF: 8 pages
Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 773569 (20 July 2010); doi: 10.1117/12.857095
Show Author Affiliations
Basil Blank, PulseRay (United States)
Chuck Henderson, PulseRay (United States)
John C. Wilson, Univ. of Virginia (United States)
Fred R. Hearty, Univ. of Virginia (United States)
Michael F. Skrutskie, Univ. of Virginia (United States)
Thomas P. O'Brien, Ohio State Univ. (United States)
Steven R. Majewski, Univ. of Virginia (United States)
Ricardo Schiavon, Gemini Observatory (United States)
Paul Maseman, The Univ. of Arizona (United States)
Sophia Brunner, Univ. of Virginia (United States)
Adam Burton, Univ. of Virginia (United States)
Eric Walker, Univ. of Virginia (United States)

Published in SPIE Proceedings Vol. 7735:
Ground-based and Airborne Instrumentation for Astronomy III
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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