Cryogenically cooled radiation shield device and associated method

A space vehicle comprising:

• a capsule;
• and
• a radiation shield device comprising:
• at least one first coil comprised of a superconductive material;
• first and second conduits extending about the capsule, wherein the at least one first coil is disposed within the first conduit so as to also extend within the first conduit about the area to be shielded from radiation, and wherein the first conduit is disposed within the second conduit;
• first and second cryogen liquids disposed within the first and second conduits, respectively, wherein the second cryogen liquid is disposed within the second conduit exterior of the first conduit, and wherein the first cryogen liquid has a lower boiling point than the second cryogen liquid;
• at least one second coil comprised of a superconductive material;
• third and fourth conduits extending about the capsule and also extending about the first and second conduits, wherein the at least one second coil is disposed within the third conduit so as to extend within the third conduit about the capsule, and wherein the third conduit is disposed within the fourth conduit;
• and
• first and third cryogen liquids disposed within the third conduit and the fourth conduit, respectively, wherein the third cryogen liquid is different than the first and second cryogen liquids.