Title :
Magnetic shield of high-Tc Bi-Pb-Sr-Ca-Cu-O superconductors at 77 K for SQUID measurements
Author :
Hoshino, K. ; Ohta, H. ; Sudoh, E. ; Katoh, K. ; Yamazaki, S. ; Takayama, H. ; Takahara, H. ; Aono, M.
Author_Institution :
Mitsui Mining & Smelting Co. Ltd., Saitama, Japan
fDate :
3/1/1991 12:00:00 AM
Abstract :
The authors have developed a relatively large high-Tc Bi-Pb-Sr-Ca-Cu-O superconducting magnetic shield vessel of 150 mm in inner diameter, 320 mm in depth, and 10 mm in thickness. It is applicable to biomagnetic measurements with a SQUID. Magnetic fields inside the vessel were measured by using a RF SQUID magnetometer or measuring induced voltages in a pickup coil. The shielding factors, defined as the ratio of the magnetic field at 290 K to that at 77 K, were around 105-106. The magnetic shielding of high-Tc superconductor is promising for neuromagnetic measurements with SQUIDs
Keywords :
SQUIDs; bismuth compounds; calcium compounds; high-temperature superconductors; lead compounds; magnetic field measurement; magnetic shielding; strontium compounds; superconducting devices; 77 K; Bi-Pb-Sr-Ca-Cu-O; SQUID measurements; biomagnetic measurements; high temperature superconductors; magnetic shield vessel; neuromagnetic measurements; shielding factors; Biomagnetics; Frequency measurement; High temperature superconductors; Magnetic field measurement; Magnetic shielding; SQUID magnetometers; Superconducting coils; Superconducting magnets; Superconductivity; Voltage;
Journal_Title :
Magnetics, IEEE Transactions on
