Abstract: A high temperature superconductor lead assembly for reducing the heat leak into a cryocooled system features a shroud configured for at least partial submersion in a cryogenic fluid contained within a bath chamber, and a high temperature superconductor lead element at least partially contained within the shroud. In use, a portion of the high temperature superconductor lead element contained within the shroud extends below a fluid level of the cryogenic fluid in the bath chamber. The portion of the high temperature superconductor lead element is thermally shielded by the shroud such that it is maintained at a temperature higher than the temperature of the cryogenic fluid. The shroud is a double-walled vacuum structure with a sealed end and an open end. In use, the open end is submerged in the cryogenic fluid.

Abstract: A high temperature superconductor lead assembly for reduces the heat leak into a cryocooled magnet system includes a superconductor and a first lead connector bonded to a first end of the superconductor. The lead connector includes an electrically insulating, thermally conductive ceramic mount for attachment to a mechanical cryocooler for cooling the connector. The superconductor is in the form of a stack of ribbons. The superconductor is attached to an electrically and thermally insulating support. A cryocooled magnet system includes a mechanical cryocooler having a warm end and a cold end, a superconductor magnet maintained at a temperature of the cold end of the cryocooler, two superconductor leads, and two current carrying leads for supplying power to the superconductor leads.