| CPC H01F 6/065 (2013.01) [H01F 6/04 (2013.01)] | 2 Claims |
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1. A current lead arrangement for supplying current to a superconducting magnet coil, comprising:
a current lead comprising a first section of low temperature superconductor (LTS) wire joined to a second section of a high temperature superconductor (HTS) material, which is in turn joined to a third section of a resistive material,
wherein each of the first section, the second section, and the third section is configured to extend, in that order, upward and away from the superconducting magnet coil;
a cryogenic refrigerator comprising a first cooling stage and a second cooling stage, the first cooling stage being located above the second cooling stage,
wherein a lower end of the third section and an upper end of the second section are thermally linked to the first cooling stage,
wherein a lower end of the first section is configured to be thermally and electrically connected to the superconducting magnet coil; and
a first thermal link thermally in contact with the second cooling stage and configured to be thermally in contact with the superconducting magnet coil, the first thermal link being provided with a heat switch to interrupt a thermal conductivity of the first thermal link,
wherein the second section extends downwards beyond the second cooling stage and is thermally linked to the second cooling stage by a second thermal link provided partially along the second section of the high temperature superconductor, and
wherein a lower end of the second section and an upper end of the first section are thermally isolated from the second cooling stage by an intermediate portion of the second section, which is located between the lower end of the second section and the second thermal link.
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