Title :
Fabrication and characterization of high Tc superconducting magnetic shield
Author :
Chandra, Ramesh ; Gupta, A.K. ; Khare, Neeraj ; Tomar, V.S. ; Arora, S.K. ; Ojha, V.N. ; Khurana, B.S. ; Singh, Satbir ; Das, B.K.
Author_Institution :
Nat. Phys. Lab., New Delhi, India
fDate :
3/1/1991 12:00:00 AM
Abstract :
Superconducting magnetic shields of Y-Ba-Cu-O superconductor were fabricated in tubular form with one end closed. These shields were used successfully to reduce the flux noises of a two-hole RF SQUID of Y-Ba-Cu-O superconductor. Hysteretic critical current density and penetrated field amplitude under increasing and decreasing magnetic fields reveal the presence of grain boundary weak links. The flux trapping behavior can be explained by using a modified version of C.P. Bean´s self-field-limiting model (1962)
Keywords :
barium compounds; critical current density (superconductivity); flux pinning; grain boundaries; high-temperature superconductors; magnetic shielding; superconducting devices; yttrium compounds; Y-Ba-Cu-O; characterization; flux noise reduction; flux trapping behavior; grain boundary weak links; high temperature superconductors; hysteretic critical current density; penetrated field amplitude; self-field-limiting model; superconducting magnetic shield; tubular form; two-hole RF SQUID; Fabrication; Magnetic flux; Magnetic noise; Magnetic shielding; Noise reduction; Radio frequency; SQUIDs; Superconducting device noise; Superconducting magnets; Yttrium barium copper oxide;
Journal_Title :
Magnetics, IEEE Transactions on
