Cryogenic characterization of the Planck sorption cooler system flight model

Details Cryogenic characterization of the Planck sorption cooler system flight model Cryogenic characterization of the Planck sorption cooler system flight model

2010-01-26

arxiv.org/abs/1001.4628v1

G Morgante et al 2009 JINST 4 T12016

Astronomy and Astrophysics

Astrophysics

Instrumentation and Methods for Astrophysics

This is an author-created, un-copyedited version of an article accepted for publication in Journal of Instrumentation. IOP Pub

Scientific paper

10.1088/1748-0221/4/12/T12016

This paper is part of the Prelaunch status LFI papers published on JINST: http://www.iop.org/EJ/journal/-page=extra.proc5/1748-0221 Two continuous closed-cycle hydrogen Joule-Thomson (J-T) sorption coolers have been fabricated and assembled by the Jet Propulsion Laboratory (JPL) for the European Space Agency (ESA) Planck mission. Each refrigerator has been designed to provide a total of ~ 1W of cooling power at two instrument interfaces: they directly cool the Planck Low Frequency Instrument (LFI) around 20K while providing a pre-cooling stage for a 4 K J-T mechanical refrigerator for the High Frequency Instrument (HFI). After sub-system level validation at JPL, the cryocoolers have been delivered to ESA in 2005. In this paper we present the results of the cryogenic qualification and test campaigns of the Nominal Unit on the flight model spacecraft performed at the CSL (Centre Spatial de Liege) facilities in 2008. Test results in terms of input power, cooling power, temperature, and temperature fluctuations over the flight allowable ranges for these interfaces are reported and analyzed with respect to mission requirements.

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