Reference : A Test Cryostat for Herschel-PACS Mechanism
Scientific congresses and symposiums : Paper published in a book
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/41137
A Test Cryostat for Herschel-PACS Mechanism
English
Renotte, Etienne mailto [Université de Liège - ULg > > CSL (Centre Spatial de Liège) >]
Barzin, Pascal mailto [Université de Liège - ULg > > CSL (Centre Spatial de Liège) >]
Guiot, Marc mailto [Université de Liège - ULg > > CSL (Centre Spatial de Liège) >]
Plesseria, Jean-Yves mailto [Université de Liège - ULg > > CSL (Centre Spatial de Liège) >]
Jamotton, Pierre mailto [Université de Liège - ULg > > CSL (Centre Spatial de Liège) >]
Delrée, Charlotte [ > > ]
Marquet, Benoit mailto [Université de Liège - ULg > > CSL (Centre Spatial de Liège) >]
Sep-2001
ESA-SP-467
SCHÜRMANN B.
No
International
4th International Symposium on Environmental Testing for Space Programmes
du 12 juin 2001 au 14 juin 2001
ESTEC (ESA)
Liege
Belgium
[en] environmental test methods ; instrumentation ; simulation
[en] The PACS Grating Assembly consists of a flat ruled grating of 320x80 mm²; its positioning mechanism; and launch-locking system. The Grating Assembly is part of the PACS Focal Plane Unit (FPU) and is operated at liquid helium temperature (4K). It is remote-controlled from the Detector & Mechanism Controller (DEC/MEC), which is located on the Herschel Service Module.
The grating shall be capable of accurate positioning (4 arcsec) within a large angular throw (40 arcdeg) and restricted dissipation to the 4K heat sink (< 5 mW).
The development of the Grating mechanism controller has urged the need for a cryogenic simulator of the Grating Assembly with regard to the large change in value of mechanical and electrical characteristics between room temperature and liquid helium temperature. The simulator consists of a functional prototype of the Grating Assembly and a dedicated helium cryostat with appropriate interfaces.
The test cryostat is a homemade facility (CSL) designed to cool down the prototype (and subsequent models) to liquid helium temperature. The test set-up also provides relevant instrumentation such as cryogenic temperature read-out, electrical feedthroughs toward the payload and optical viewport.
http://hdl.handle.net/2268/41137

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