Magnetic shielding by superconducting Y-Ba-Cu-O hollow cylinders

Conference · Fri Jan 01 00:00:00 EST 1988

DOI:https://doi.org/10.1109/20.92816· OSTI ID:6929322

Willis, J O; McHenry, M E; Maley, M P; Sheinberg, H

We have measured the magnetic field H' at the center of a hollow tube of sintered Y-Ba-Cu-O superconductor as a function of applied field H, temperature, tube length, and tube wall thickness. The maximum field that can be shielded H/sub sh/ agrees with the value calculated from the critical state model using the measured critical current density J/sub c/. The maximum trapped field H/sub tr/ in the tube upon decreasing H to zero exceeds H/sub sh/ by as much as a factor of two, and large enhancements in J/sub c/ are observed in decreasing field. These phenomena are identified with intragranular flux pinning present only after H has exceeded H/sub c1/ of the grains. Finite tube length does not affect the H/sub tr//H/sub sh/ ratio appreciably. H/sub sh/ depends approximately on the square root of the wall thickness. 7 refs., 4 figs.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 6929322
• Report Number(s): LA-UR-88-2816; CONF-880812-1; ON: DE88016154
• Resource Relation: Journal Volume: 25; Journal Issue: 2; Conference: Applied superconductivity conference, San Francisco, CA, USA, 21 Aug 1988; Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
SUPERCONDUCTORS
MAGNETIC SHIELDING
CURRENT DENSITY
CYLINDERS
MAGNETIC FIELDS
TEMPERATURE DEPENDENCE
YTTRIUM OXIDES
CHALCOGENIDES
OXIDES
OXYGEN COMPOUNDS
SHIELDING
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
420201* - Engineering- Cryogenic Equipment & Devices