Patent ID: 6804968
Filing Date: 2004-10-19
Classification: F17C,F25B,F25D,G01R

Abstract:
A cryostat configuration for keeping liquid helium, the cryostat configuration comprising:an outer jacket at ambient temperature during operation of the cryostat configuration; a helium container disposed within said outer jacket, said helium container containing helium during operation of the cryostat configuration; a neck pipe filled with gaseous helium during operation of the cryostat configuration, wherein an upper end of said neck pipe is connected to said outer jacket and a lower end of said neck pipe is connected to said helium container, wherein said outer jacket, said helium container and said neck pipe delimit an evacuated chamber which surrounds said helium container; a refrigerator having a cooling finger which extends from said upper end of said neck pipe into and through said neck pipe and has a condensation body disposed in a region of said lower end of said neck pipe, said condensation body cooled to a temperature of liquid helium during operation; and a thermal control device, said thermal control device having a condensation chamber which at least partially surrounds said condensation body, said condensation chamber having a lower opening to permit flow of liquid helium, condensed in said condensation chamber, into said helium container, said condensation chamber also having an upper opening, said thermal-control device further having a gas supply pipe having a lower opening communicating with said upper opening in said condensation chamber and an upper opening terminating in a region of said upper end of said neck pipe and inside said neck pipe.