Coupling a cryogenic cooler to a body to be cooled

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(11)

EP 0 350 266 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	23.01.1991 Bulletin 1991/04

(43)	Date of publication A2:
	10.01.1990 Bulletin 1990/02

(21)	Application number: 89306786.8

(22)	Date of filing: 04.07.1989

(51)	International Patent Classification (IPC)⁵: H01F 7/22, F17C 13/00, F17C 3/08, F25D 19/00

(84)	Designated Contracting States:
	DE FR GB NL

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Priority:

05.07.1988 US 215114

(71)	Applicant: GENERAL ELECTRIC COMPANY
	Schenectady, NY 12345 (US)

(72)	Inventor:
	Brzozowski, Steven Joseph Scotia New York 12302 (US)

(74)	Representative: Pratt, Richard Wilson et al
	London Patent Operation G.E. Technical Services Co. Inc. Essex House 12/13 Essex Street London WC2R 3AA London WC2R 3AA (GB)

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References cited: :

(54)	Coupling a cryogenic cooler to a body to be cooled

(57) Demountable cryocooler cold heads must make reliable contacts having low thermal resistance at cryogenic temperatures for cooling devices such as radiation shields used in superconducting magnets. Cryostat vacuum and a bellows (25) is utilized in order to engage the cold head second stage (73) interface, while the first stage (75) interface is independently engaged by means of a bolted flange (47) and a bellows (53). A soft metal (81) such as indium is employed at the contact surface of the heat station.

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