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The 300-mK system for Herschel-SPIRE

Hargrave, Peter Charles, Bock, James, Brockley-Blatt, Christine, Coker, John, Duband, Lionel, Goizel, Anne-Sophie, Griffin, Douglas, Swinyard, Bruce and Winter, Berend 2006. The 300-mK system for Herschel-SPIRE. Presented at: Millimeter and Submillimeter Detectors and Instrumentation for Astronomy III, Orlando, FL, USA, 29-31 May 2006. Published in: Zmuidzinas, Jonas, Holland, Wayne S., Withington, Stafford and Duncan, William D. eds. Millimeter and Submillimeter Detectors and Instrumentation for Astronomy III (Proceedings). Proceedings of SPIE--the International Society for Optical Engineering , vol. 6275. Bellingham, WA: The International Society for Optical Engineering, p. 627513. 10.1117/12.673191

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The design of the 300 mK system for Herschel-SPIRE is complex, with many difficult, sometimes conflicting, requirements and constraints placed upon it. Five detector arrays, mounted from a 2 K box, are linked to a single 3He sorption-cooler tip by a high-conductance copper strap network. This strap retains high thermal conductance, even though it incorporates an electrical break to comply with the SPIRE grounding scheme. It requires stiffness to withstand launch vibrations, but needs compliance to avoid transmission of loads to the detector arrays. The strap is stiffly supported by novel, compact cryogenic stand-offs which provide a high degree of thermal isolation from the 2 K stage. An additional complication is that the detectors reside in a 2 K environment, whilst the cooler tip is in a 4 K environment. Two of the cryogenic stand-offs also act as light-tight feed-throughs to pass the strap from the 4 K environment to the inside of the 2 K detector boxes. Active thermal control is provided on the 300 mK system to address the detector stability requirements. This paper describes the system, and gives results of the performance in SPIRE flight model ground tests.

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: copper ; detector arrays ; networks ; sensors
Publisher: The International Society for Optical Engineering
ISBN: 9780819463401
ISSN: 0277-786X
Last Modified: 04 Jun 2017 06:48

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