The Cryogenic System of the Herschel Extended Payload Module

Details The Cryogenic System of the Herschel Extended Payload Module The Cryogenic System of the Herschel Extended Payload Module

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aipc..710..505h&link_type=abstract

ADVANCES IN CRYOGENIC ENGEINEERING: Transactions of the Cryogenic Engineering Conference - CEC. AIP Conference Proceedings, Vol

Other

Cryogenics, Refrigerators, Low-Temperature Detectors, And Other Low-Temperature Equipment, Space-Based Ultraviolet, Optical, And Infrared Telescopes, Spaceborne And Space Research Instruments, Apparatus, And Components, Dilute Superfluid 3He In He Ii

Scientific paper

As part of the European Space Agency's Herschel-Planck Mission, which will be launched by an Ariane 5 launcher in 2007, the Herschel Extended Payload Module will provide the required cryogenic thermal environment for the three scientific instruments. The instruments will measure astronomical signals in the wavelength range between 60 μm and 670 μm from an L2 orbit. The Cryostat has to provide as lowest stable temperature level 1.7 K to the instruments Focal Plane Units in order to measure the very low astronomical signals. Beside this temperature level three additional temperature levels have to be provided by the cryostat. The Herschel cryostat is equipped with two helium tanks. The main tank has a volume of 2367 1 and is filled with super-fluid helium to provide the cryogenic lifetime of 3.5 years and the required thermal environment. The auxiliary tank is mainly used for the autonomy phase of the satellite prior to launch, when no access to the cryostat is possible. The overall cryogenic system and the thermal design of the Herschel Extended Payload Module will be presented.

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