Title :
Superconducting permanent magnets
Author :
Wipf, Stefan L. ; Laquer, Henry L.
Author_Institution :
CryoPower Associates, Los Alamos, NM, USA
fDate :
3/1/1989 12:00:00 AM
Abstract :
The authors discuss means to verify the analysis and the limitations imposed by the low critical current densities in presently available high-temperature superconductors. Based on experimental data, it is concluded that : (1) high-temperature superconductors can be used as permanent magnets with trapped fields of at least 3 T at 77 K; (2) their energy product should be as high as 1.8 MJ/m3 or 255 MG-Oe; (3) the magnetizing field has to be four times as large as the trapped field, or 12 T; (4) permanent-magnet use of high-temperature superconductors bypasses the problems of wire or tape manufacture; and (5) widespread use of this concept will depend on improved critical current densities
Keywords :
critical current density (superconductivity); high-temperature superconductors; permanent magnets; superconducting magnets; 12 T; 3 T; 77 K; energy product; high-temperature superconductors; low critical current densities; magnetizing field; superconducting permanent magnets; trapped fields; Creep; Critical current density; High temperature superconductors; Magnetic materials; Nitrogen; Permanent magnets; Superconducting coils; Superconducting magnets; Superconducting materials; Superconductivity;
Journal_Title :
Magnetics, IEEE Transactions on
