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Proceedings Paper

The cryo-mechanical design of SCUBA-2: a wide-field imager for the James Clerk Maxwell Telescope
Author(s): David Gostick; Dave Montgomery; Bob Wall; Helen McGregor; Mark Cliffe; Adam Woodcraft; Fred Gannaway
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Paper Abstract

The SCUBA-2 instrument is a new wide-field imager under development for the James Clerk Maxwell Telescope on Mauna Kea in Hawaii and due to be operational in 2006. The instrument has two separate focal planes and is designed to observe simultaneously at wavelengths of 450 and 850μm. The instrument cryostat will weigh around 2500kg and has a volume of approximately 2.4x1.8x2.0m. The two detector arrays are operated at ~100mK and are surrounded by a cold enclosure at ~1K. Both the arrays and cold enclosure are cooled by a novel, liquid cryogen-free dilution refrigerator. To reduce the thermal background on the arrays to a minimum the main optics structure, weighing in excess of 450kg, must be cooled to less than 15K. A pair of low vibration pulse tube coolers are used to cool this structure and a radiation shield at ~60K. This paper describes the cryo-mechanical design of SCUBA-2 and discusses some of the issues and techniques needed to both cool the instrument within a reasonable timescale, and operate it in the required temperature regime

Paper Details

Date Published: 30 September 2004
PDF: 12 pages
Proc. SPIE 5492, Ground-based Instrumentation for Astronomy, (30 September 2004); doi: 10.1117/12.551749
Show Author Affiliations
David Gostick, UK Astronomy Technology Ctr. (United Kingdom)
Dave Montgomery, UK Astronomy Technology Ctr. (United Kingdom)
Bob Wall, UK Astronomy Technology Ctr. (United Kingdom)
Helen McGregor, UK Astronomy Technology Ctr. (United Kingdom)
Mark Cliffe, UK Astronomy Technology Ctr. (United Kingdom)
Adam Woodcraft, Cardiff Univ. (United Kingdom)
Fred Gannaway, Cardiff Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 5492:
Ground-based Instrumentation for Astronomy
Alan F. M. Moorwood; Masanori Iye, Editor(s)

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