| 摘要 |
A current lead assembly 14 and its cooling method, suitable for a superconducting magnet, comprises at least one current lead 16, 18 with at least one thermal device 30 coupled to a portion 24 of the lead 16, 18, where the said thermal device 30 includes a cryogen fluid flow path 32 extending through it and is arranged to cool the said portion 24 of the current lead. The cooled portion 24 of the current lead is the cold end portion of the lead, which, in use, may be electrically connected to a conductive winding 124, 126 of a superconducting magnet. The thermal device 30 may be made of metal or a metal alloy such as copper, aluminium, silver or brass and it may be an integral portion of a current lead 16, 18. Both positive and negative current leads 16, 18 may be involved with the cooling system. The cooling system may avoid the use of an electrical insulating material between the cooling device 30 and the current leads 16, 18 by either providing separate cooling systems for each of the leads 16, 18 or by providing electrical insulation 48 between portions of the cooling system. Electrical isolation tube portions 48 may be used in the cooling system. The cryogenic fluid may be a liquid/gas and the cooling system may include a cryogenic liquid container 42 and/or a boiled-off gas re-condenser.
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