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Proceedings Paper

Cryogenic magnetic shielding for SCUBA-2
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Paper Abstract

SCUBA-2 is a new wide-field submillimeter continuum instrument being commissioned on the James Clerk Maxwell Telescope on Mauna Kea in Hawaii. SCUBA-2 uses large-scale arrays of superconducting bolometers with SQUID- (superconducting quantum interference device) based multiplexing and amplification. The sensitivity of the devices that compose the detector arrays to magnetic fields is such that magnetic shielding, consisting of superconducting and high-permeability materials, was fitted to the detector enclosure at 1 K to reduce the magnetic field strength at the focal plane. This paper describes the design and construction of the cryogenic shielding, and presents verification measurements. The shielding performance was found to meet the instrument requirements, and compared well to the modelled results.

Paper Details

Date Published: 19 July 2008
PDF: 10 pages
Proc. SPIE 7020, Millimeter and Submillimeter Detectors and Instrumentation for Astronomy IV, 702023 (19 July 2008); doi: 10.1117/12.787795
Show Author Affiliations
Matthew Hollister, Institute for Astronomy, Royal Observatory (United Kingdom)
Helen McGregor, UK Astronomy Technology Ctr., Royal Observatory (United Kingdom)
Adam Woodcraft, Institute for Astronomy, Royal Observatory (United Kingdom)
UK Astronomy Technology Ctr., Royal Observatory (United Kingdom)
Dan Bintley, Joint Astronomy Ctr. (United States)
Michael MacIntosh, UK Astronomy Technology Ctr., Royal Observatory (United Kingdom)
Wayne Holland, UK Astronomy Technology Ctr., Royal Observatory (United Kingdom)


Published in SPIE Proceedings Vol. 7020:
Millimeter and Submillimeter Detectors and Instrumentation for Astronomy IV
William D. Duncan; Wayne S. Holland; Stafford Withington; Jonas Zmuidzinas, Editor(s)

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