An Analysis of 50mK and 300mK Cryogenic Environments for Future ESA Science Missions

Details An Analysis of 50mK and 300mK Cryogenic Environments for Future ESA Science Missions An Analysis of 50mK and 300mK Cryogenic Environments for Future ESA Science Missions

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc..985.1640r&link_type=abstract

ADVANCES IN CRYOGENIC ENGINEERING: Transactions of the Cryogenic Engineering Conference - CEC, Vol. 52. AIP Conference Proceedin

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Spaceborne And Space Research Instruments, Apparatus, And Components, Chemisorption/Physisorption: Adsorbates On Surfaces, Thermodynamic Properties, Equations Of State, Cryogenics, Refrigerators, Low-Temperature Detectors, And Other Low-Temperature Equipment

Scientific paper

A number of future European Space Agency (ESA), science missions may require detector cooling to sub-Kelvin temperatures. One such mission is the X-ray Evolving Universe Spectroscopy (XEUS), mission, which is a candidate for the ESA Cosmic Vision 2015-2025 plan, following XMM-Newton and Chandra. The Detector Spacecraft model payload comprises a passively cooled wide-field camera at 200K, and one of two narrow-field instruments at 300mK and 50mK. As with several other science missions, the required lifetime is at least 5 years, with a 10 year goal, necessitating the use of long-life closed cycle cooling systems. Under contract to ESA, Astrium has worked with the Mullard Space Science Laboratory (MSSL), Rutherford Appleton Laboratory (RAL), and CEA-SBT, to propose a payload accommodation design for XEUS capable of meeting the demanding requirements. Our baseline consists of a two stage Adiabatic Demagnetization Refrigerator (ADR), at 50mK, and a helium sorption cooler at 300mK. Each system will be pre-cooled by a closed cycle J-T system, similar to Planck, at 2.5K or 4K, which itself will be pre-cooled by a two-stage Stirling cycle cooler, at 17K or 18K. This paper describes the mission, and discusses the cryogenic architectures in depth.

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