CERN Accelerating science

Article
Report number	CERN-AT-2008-034
Title	Thin Cryogenic X-ray Windows
Author(s)	Niinikoski, T O (CERN) ; Bellanger, B (CERN) ; Davenport, M (CERN) ; Elias, N (CERN) ; Aune, S (Saclay ; DSM, DAPNIA, Saclay) ; Franz, J (Freiburg U.)
Publication	2009
Imprint	21 Jul 2008
Number of pages	7
In:	22nd International Cryogenic Engineering Conference and International Cryogenic Materials Conference 2008, Seoul, Republic of Korea, 21 - 25 Jul 2008, pp.871-876
Subject category	Accelerators and Storage Rings
Abstract	We describe the construction and tests of cryogenic X-ray windows of 47 mm diameter made of 15 ìm thick polypropylene foil glued on a UHV flange and supported with a strongback mesh machined by electro-erosion. These hermetic windows of the solar axion telescope of the CAST experiment at CERN withstand the static and dynamic pressures of the buffer gas that are normally below 130 mbar, but may reach 1.2 bar when the magnet quenches. They were tested at 60 K up to 3.5 bar static pressure without permanent deformation.

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