ORBi: Renotte Etienne - A Test Cryostat for Herschel-PACS Mechanism

Reference : A Test Cryostat for Herschel-PACS Mechanism


	Document type :	Scientific congresses and symposiums : Paper published in a book
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
	To cite this reference:	http://hdl.handle.net/2268/41137

Title :	A Test Cryostat for Herschel-PACS Mechanism
Language :	English
Author, co-author :	Renotte, Etienne [Université de Liège - ULg > > CSL (Centre Spatial de Liège) >]
	Barzin, Pascal [Université de Liège - ULg > > CSL (Centre Spatial de Liège) >]
	Guiot, Marc [Université de Liège - ULg > > CSL (Centre Spatial de Liège) >]
	Plesseria, Jean-Yves [Université de Liège - ULg > > CSL (Centre Spatial de Liège) >]
	Jamotton, Pierre [Université de Liège - ULg > > CSL (Centre Spatial de Liège) >]
	Delrée, Charlotte [ > > ]
	Marquet, Benoit [Université de Liège - ULg > > CSL (Centre Spatial de Liège) >]
Publication date :	Sep-2001
Main document title :	ESA-SP-467
Author, co-author :	SCHÜRMANN B.
Audience :	International
Event name :	4th International Symposium on Environmental Testing for Space Programmes
Event date :	du 12 juin 2001 au 14 juin 2001
Event organizer :	ESTEC (ESA)
Event place (city) :	Liege
Event country :	Belgium
Keywords :	[en] environmental test methods ; instrumentation ; simulation
Abstract :	[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.
Permalink :	http://hdl.handle.net/2268/41137

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