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Proceedings Paper

Thermal architecture of the SPICA/SAFARI instrument
Author(s): Ivan Charles; Lionel Duband; Jean-Marc Duval; Brian Jackson; Willem Jellema; Peter Paul Kooijman; Nicolas Luchier; Thierry Tirolien; Henk van Weers
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Paper Abstract

The SAFARI instrument is a far infrared imaging spectrometer that is a core instrument of the SPICA mission. Thanks to the large (3 meter) SPICA cold telescope, the ultra sensitive detectors and a powerful Fourier Transform Spectrometer, this instrument will give access to the faintest light never observed in the 34 μm - 210 μm bandwidth with a high spectral resolution. To achieve this goal, TES detectors, that need to be cooled at a temperature as low as 50 mK, have been chosen. The thermal architecture of the SAFARI focal plane unit (FPU) which fulfils the TES detector thermal requirements is presented. In particular, an original 50 mK cooler concept based on a sorption cooler in series with an adiabatic demagnetization refrigerator will be used. The thermal design of the detector focal plane array (FPA) that uses three temperature stages to limit the loads on the lowest temperature stage, will be also described. The current SAFARI thermal budget estimations are presented and discussed regarding the limited SPICA allocations. Finally, preliminary thermal sensitivity analysis dealing with thermal stability requirements is presented.

Paper Details

Date Published: 5 October 2012
PDF: 12 pages
Proc. SPIE 8452, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI, 84521P (5 October 2012); doi: 10.1117/12.926910
Show Author Affiliations
Ivan Charles, Institut Nanosciences et Cryogénie, CNRS, Univ. Joseph Fourier (France)
Lionel Duband, Institut Nanosciences et Cryogénie, CNRS, Univ. Joseph Fourier (France)
Jean-Marc Duval, Institut Nanosciences et Cryogénie, CNRS, Univ. Joseph Fourier (France)
Brian Jackson, SRON Netherlands Institute for Space Research (Netherlands)
Willem Jellema, SRON Netherlands Institute for Space Research (Netherlands)
Peter Paul Kooijman, SRON Netherlands Institute for Space Research (Netherlands)
Nicolas Luchier, Institut Nanosciences et Cryogénie, CNRS, Univ. Joseph Fourier (France)
Thierry Tirolien, European Space Research and Technology Ctr. (Netherlands)
Henk van Weers, SRON Netherlands Institute for Space Research (Netherlands)


Published in SPIE Proceedings Vol. 8452:
Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI
Wayne S. Holland, Editor(s)

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