Superconducting magnet system with refrigerator for re-liquifying cryogenic fluid in a tubular conduit

Abstract

A superconducting magnet system with a superconducting magnet coil system, which is disposed in a cryogenic fluid tank ( 2 ) of a cryostat ( 1 ), and an exchangeable refrigerator ( 5; 31 ) which is operated in a vacuum container ( 8 ) and is provided to re-liquify the cryogenic fluid flowing through a tubular conduit ( 4; 21 ) is characterized in that the tubular conduit ( 4; 21 ) is rigidly installed in the cryostat ( 1 ). The refrigerator reaches its optimum performance during operation in a vacuum, and can be easily exchanged in case of a defect.

Description

[0001] This application claims Paris Convention priority of DE 10 2005 042 834.7 filed Sep. 09, 2005 the complete disclosure of which is hereby incorporated by reference. BACKGROUND OF THE INVENTION [0002] The invention concerns a superconducting magnet system with a superconducting magnet coil system which is disposed in a cryogenic fluid tank of a cryostat, and an exchangeable refrigerator which is operated in a vacuum container to re-liquify the cryogenic fluid that flows through a tubular conduit. [0003] A magnet system of this type is disclosed in Cryogenics 38 (1998), pages 337 to 341. [0004] Superconducting magnet coil systems are used to generate strong magnetic fields. However, the superconducting properties only establish themselves at low temperatures. For this reason, the magnet coil system must be cooled and is therefore disposed in the cryogenic fluid tank of a cryostat. The cryogenic fluid is mainly present in its liquid state, having a maximum temperature which corre...

AI Technical Summary

Benefits of technology

[0008] This object is achieved in accordance with the invention by a superconducting magnet system of the above-mentioned type, which is characterized in that the tubular conduit is rigidly installed in the cryostat. The tubular conduit is therefore not rigidly connected to the refrigerator as in prior art, but may remain in the cryostat in case the refrigerator fails. The opening for the tubular conduit between the vacuum tank of the refrigerator and the cryogenic fluid tank can be optimally sealed

Problems solved by technology

However, the superconducting properties only establish themselves at low temperatures.

Due to unavoidable heat input into the cryostat, the cryogenic fluid must normally be regularly refilled.

This process causes downtimes and incurs expense, since the system is disturbed by refilling.

Exchan

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