A cryostat configuration for keeping liquid helium, comprising an outer jacket ( 2 ) accommodating a helium container ( 5 ), a neck pipe ( 3 ) which is filled with gaseous helium during operation, and a refrigerator ( 1; 1 b ), wherein the outer jacket ( 2 ), the helium container ( 5 ) and the nec
A cryostat configuration for keeping liquid helium, comprising an outer jacket ( 2 ) accommodating a helium container ( 5 ), a neck pipe ( 3 ) which is filled with gaseous helium during operation, and a refrigerator ( 1; 1 b ), wherein the outer jacket ( 2 ), the helium container ( 5 ) and the neck pipe ( 3 ) delimit an evacuated chamber ( 9 ) which surrounds the helium container ( 5 ); and wherein the refrigerator ( 1; 1 b ) has a cooling finger ( 4 ) which has a condensation body ( 15; 15 b ) in the region of the lower end of the neck pipe ( 3 ), is characterized in that the condensation body ( 15; 15 b ) is partially surrounded by a condensation chamber ( 16; 16 b ) which has a first lower opening ( 17 ) to permit draining of liquid helium, and a second opening which communicates with a lower end of a gas supply pipe ( 18 ), wherein the upper end of the gas supply pipe ( 18 ) terminates in the region of the upper end of the neck pipe ( 3 ). This improves the thermal properties of the cryostat configuration. In particular, the convection flow inside the neck pipe ( 3 ) is controlled.
대표청구항▼
1. 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 cry
1. 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; anda 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. 2. The cryostat configuration of claim 1, further comprising a radiation shield disposed within said evacuated chamber, said radiation shield coupled to said neck pipe in a thermally conducting fashion. 3. The cryostat configuration of claim 2, further comprising a connecting element disposed in said neck pipe between said radiation shield and a stage of said refrigerator. 4. The cryostat configuration of claim 3, wherein said connecting element contains copper. 5. The cryostat configuration of claim 4, wherein said connecting element consists essentially of copper. 6. The cryostat configuration of claim 3, wherein said connecting element divides an inside of said neck pipe into an upper and lower part, wherein said gas supply pipe penetrates through said connecting element, wherein said connecting element has one or more gas passage openings in an outer region thereof facing said evacuated chamber. 7. The cryostat configuration of claim 1, wherein said refrigerator is a pulse tube cooler. 8. The cryostat configuration of claim 1, wherein said condensation chamber has a thermal conductivity of less than 300W/mK. 9. The cryostat configuration of claim 1, wherein said gas supply pipe comprises a heat exchanger which thermally couples said gas supply pipe to the gaseous helium located in said neck pipe. 10. The cryostat configuration of claim 1, wherein said lower opening in said condensation chamber is completely immersed in liquid helium of said helium container during normal operation. 11. The cryostat configuration of claim 1, further comprising a pipe-shaped extension disposed on said lower opening of said condensation chamber, said pipe shaped extension having a lower open end completely immersed in liquid helium of said helium container during normal operation. 12. The cryostat configuration of claim 1, wherein said refrigerator is structured and operated such that no helium evaporates from said helium container during normal operation. 13. The cryostat configuration of claim 1, wherein said helium container contains a superconducting magnet coil. 14. The cryostat configuration of claim 13, wherein said superconducting magnet coil is superconductingly short-circuited during normal operation. 15. The cryostat configuration of claim 1, wherein the cryostat configuration is part of an NMR apparatus.
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이 특허에 인용된 특허 (8)
Marco Strobel DE; Michael Westphal DE, Circulating cryostat.
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