STUDIES OF MAGNETIC SHIELDING AND SUPERCONDUCTIVITY
GENERAL DYNAMICS CORP FORT WORTH TX FORT WORTH United States
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Theoretical considerations of magnetic active shielding of space vehicles against charged particle cosmic-radiation indicate inadequate treatment in feasibility studies. Simplified expressions for the magnetic vector potential lead to predictions of possibly fictitious completely-shielded regions. The mathematical model presented herein avoids this deficiency, and a method of determining the completely shielded regions is developed. Experimental investigations establish the capability of winding superconducting solenoids and making junctions between superconducting wire and current-carrying leads. Junctions made by spot welding superconducting Nb-Zr wire to copper electrodes, including foil, prove to be superior in reliability, simplicity, and high current capacity. Critical currents in three superconducting solenoids, constructed to operate at 10-, 15-, and 22-kilogauss, were lower than those measured in short segments by amounts consistent with data in available literature. Persistent currents were established in two of the solenoids.
- Electricity and Magnetism