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A superconducting device, such as a superconducting rotor for a generator or motor. A vacuum enclosure has an interior wall surrounding a cavity containing a vacuum. A superconductive coil is placed in the cavity. A generally-annularly-arranged, thermally-conductive sheet has an inward-facing surfac

A superconducting device, such as a superconducting rotor for a generator or motor. A vacuum enclosure has an interior wall surrounding a cavity containing a vacuum. A superconductive coil is placed in the cavity. A generally-annularly-arranged, thermally-conductive sheet has an inward-facing surface contacting generally the entire outward-facing surface of the superconductive coil. A generally-annularly-arranged coolant tube contains a cryogenic fluid and contacts a generally-circumferential portion of the outward-facing surface of the sheet. A generally-annularly-arranged, thermally-insulative coil overwrap generally circumferentially surrounds the sheet. The coolant tube and the inward-facing surface of the coil overwrap together contact generally the entire outward-facing surface of the sheet.

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[ We claim:] [1.] A superconducting device comprising:a) a vacuum enclosure having an interior wall surrounding a generally-annular cavity, wherein said cavity has a generally longitudinal axis, and wherein said cavity contains a vacuum having a pressure not exceeding generally one-thousandth of a t

[ We claim:] [1.] A superconducting device comprising:a) a vacuum enclosure having an interior wall surrounding a generally-annular cavity, wherein said cavity has a generally longitudinal axis, and wherein said cavity contains a vacuum having a pressure not exceeding generally one-thousandth of a torr;b) a superconductive coil disposed within said cavity, generally coaxially aligned with said longitudinal axis, generally spaced-apart from said interior wall, having a circumferential outward-facing surface, and having a circumferential inward-facing surface;c) a generally-annularly-arranged sheet of thermally conductive material having a coefficient of thermal conductivity at least equal to that of copper at a temperature of generally 50 Kelvin, disposed within said cavity, generally coaxially aligned with said longitudinal axis, generally spaced-apart from said interior wall, having a circumferential outward-facing surface, and having a circumferential inward-facing surface, wherein the inward-facing surface of said sheet contacts generally the entire outward-facing surface of said superconductive coil;d) a generally-annularly-arranged coolant tube containing a cryogenic fluid having a cryogenic temperature, disposed within said cavity, generally coaxially aligned with said longitudinal axis, and generally spaced-apart from said interior wall, wherein said coolant tube contacts a generally-circumferential portion of the outward-facing surface of said sheet; ande) a generally-annularly-arranged coil overwrap of thermally insulative material having a coefficient of thermal conductivity no greater than that of fiberglass at a temperature of generally 50 Kelvin, disposed within said cavity, generally coaxially aligned with said longitudinal axis, generally spaced-apart from said interior wall, having a circumferential outward-facing surface, and having a circumferential inward-facing surface, wherein said coil overwrap generally circumferentially surrounds the outward-facing surface of said sheet, wherein said coolant tube and the inward-facing surface of said coil overwrap together contact generally the entire outward-facing surface of said sheet, and wherein said superconductive coil, said sheet, and said coil overwrap are disposed completely outside said coolant tube.