Patent ID: 8809824

Claim:
A cryogenically cooled radiation shield device comprising: at least one first coil comprised of a superconductive material; a first inner conduit extending about an area to be shielded from radiation, wherein the at least one first coil is disposed within the first inner conduit so as to also extend within the first inner conduit about the area to be shielded from radiation; a first cryogen liquid disposed within the first inner conduit along with the at least one first coil; a first outer conduit extending about the area to be shielded from radiation, wherein the first inner conduit is disposed within the first outer conduit; a second cryogen liquid, different than the first cryogen liquid, disposed within the first outer conduit exterior of the first inner conduit, wherein the first cryogen liquid has a lower boiling point than the second cryogen liquid; thermal insulation surrounding the first inner conduit and positioned between the first inner conduit and the first outer conduit; at least one second coil comprised of a superconductive material; a second inner conduit and a second outer conduit extending about the area to be shielded from radiation and also extending about the first inner conduit and the first outer conduit, wherein the at least one second coil is disposed within the second inner conduit so as to extend within the second inner conduit about the area to be shielded from radiation, and wherein the second inner conduit is disposed within the second outer conduit; and first and third cryogen liquids disposed within the second inner conduit and the second outer conduit, respectively, wherein the third cryogen liquid is different than the first and second cryogen liquids.