Magnet lead assembly
AssigneeGA Technologies Inc.
InventorJohn R. Purcell
Life of this patent
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Abstract
A lead assembly provides an electrical connection between a magnet coil maintained at low temperature in a boiling liquid bath within a closed container and a power supply terminal maintained at a higher temperature outside of the container. The assembly includes a length of cable which is superconducting at the low temperature and normally conducting at higher temperatures and is disposed within a tube which communicates with the interior of the container so as to vent vapor from the boiling liquid bath out of the container through the tube along the cable to cool the cable to superconducting temperature near the magnet coil. The cable is preferably formed of a plurality of loosely twisted copper-stabilized superconducting strands.
Claims10
A lead assembly for providing an electrical connection between a first electrical device maintained at low temperature in a boiling liquid bath within a closed container and a second electrical device maintained at a higher temperature outside of said container, the lead assembly comprising:
- a tube having an inlet end and an outlet end;
- a length of cable which is superconducting at said low temperature and normally conducting at said higher temperature, extending through said tube and protruding therefrom at said inlet end;
- means for positioning said tube with its inlet end within said container close to said bath and with its outlet end outside of said container so that vapor is vented from said boiling liquid bath through said tube to cool said length of cable near said inlet end so that said cable is superconducting near said inlet end.
Apparatus for producing a magnetic field comprising:
- an insulating vessel defining an enclosed interior;
- a bath of liquid helium contained within said vessel;
- a magnet coil immersed in said bath of liquid helium;
- a power supply for providing electrical current to said magnet coil, said power supply having a pair of terminals;
- and
- a pair of lead assemblies for providing electrical connections between said power supply and said magnet coil, each said lead assembly comprising a tube defining an interior channel communicating with the interior of said container so as to permit flow of vapor from said container into said channel, and a length of copper-stabilized superconducting cable extending from the magnet coil through the tube to one of said power supply terminals.
Dependencies are inferred from the claim text.