| 摘要 |
A cryogenic conduit assembly for conducting electricity has an outer insulating duct formed by a pair of coaxially nested tubes defining an annular chamber which receives a sleeve of reflective thermal insulation (radiation shield) and is evacuated. The interior of this duct receives a plurality of tubes each subdivided transversely into two longitudinally extending compartments, one used solely for circulation of a cryogen and the other for an electrical conductor. The conductor-receiving compartment is filled with liquid hydrogen (heat-transfer medium) which can be circulated and the other compartment contains rapidly circulating gaseous helium (cooling medium). The assembly is subdivided at joints, the duct having a transverse wall to each side of the joint to hermetically seal off the duct interior. Between these walls at the joint, in addition, there are longitudinally extending walls which define a plurality of zones each receiving one tube, and removable covers are provided for access to each of the zones. These zones can be sealed off from or connected to the duct interior by means of shunt conduits and valves during servicing.
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