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6 July 2006 The 300-mK system for Herschel-SPIRE
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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.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Peter Hargrave, James Bock, Christine Brockley-Blatt, John Coker, Lionel Duband, Anne-Sophie Goizel, Douglas Griffin, Bruce Swinyard, and Berend Winter "The 300-mK system for Herschel-SPIRE", Proc. SPIE 6275, Millimeter and Submillimeter Detectors and Instrumentation for Astronomy III, 627513 (6 July 2006);


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