Accession Number:

AD0423178

Title:

STUDIES OF MAGNETIC SHIELDING AND SUPERCONDUCTIVITY

Descriptive Note:

Technical Report

Corporate Author:

GENERAL DYNAMICS CORP FORT WORTH TX FORT WORTH United States

Personal Author(s):

• Norwood,J. M.
• Gibbons,F. L.

Report Date:

1963-11-04

Pagination or Media Count:

52.0

Abstract:

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.

Descriptors:

• SUPERCONDUCTORS
• SPACECRAFT
• SHIELDING
• SOLENOIDS
• WIRE
• MAGNETIC PROPERTIES
• CRYOGENICS
• SUPERCONDUCTIVITY
• INTEGRAL EQUATIONS
• VECTOR ANALYSIS
• MAGNETIC FIELDS
• ELECTRICAL RESISTANCE
• ELECTRIC CURRENT
• NIOBIUM
• ZIRCONIUM
• INSTRUMENTATION
• MATHEMATICAL ANALYSIS
• COSMIC RAYS
• MATHEMATICAL MODELS
• MAGNETS

Subject Categories:

• Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE