SUPERCONDUCTING MAGNETIC FIELD GENERATING DEVICE, SUPERCONDUCTING MAGNETIC FIELD GENERATING METHOD, AND NUCLEAR MAGNETIC RESONANCE APPARATUS

摘要

A superconducting magnetic field generating device includes: a superconductor including an outer superconductor formed with a high temperature superconducting material in a cylindrical shape and generating a trapped magnetic field, and an inner superconductor formed with a high temperature superconducting material in a cylindrical shape and coaxially disposed with the outer superconductor on the inner circumferential side; and a cooling device cooling the outer and inner superconductors to a temperature equal to or lower than the superconducting transition temperature, wherein the inner superconductor is formed so that a ratio (Jcθ1/Jcz1) of a critical current density (Jcθ1) of the inner superconductor in the circumferential direction to a critical current density (Jcz1) of the inner superconductor in the axial direction is closer to 1 than a ratio (Jcθ2/Jcz2) of the critical current density (Jcθ2) in the circumferential direction to a critical current density (Jcz2) of the outer superconductor of the outer superconductor in the axial direction.

主权项

1. A superconducting magnetic field generating device comprising:
a superconductor which includes an outer superconductor which is formed with a high temperature superconducting material in a cylindrical shape and generates a trapped magnetic field by trapping an applied magnetic field in a state of being cooled to a temperature equal to or lower than a superconducting transition temperature, and an inner superconductor which is formed with a high temperature superconducting material in a cylindrical shape and is coaxially disposed with the outer superconductor on the inner circumferential side of the outer superconductor; and a cooling device which cools the outer superconductor and the inner superconductor to a temperature equal to or lower than the superconducting transition temperature, wherein the inner superconductor is formed so that a ratio (Jcθ1/Jcz1) of a critical current density (Jcθ1) of the inner superconductor in the circumferential direction to a critical current density (Jcz1) of the inner superconductor in the axial direction is closer to 1 than a ratio (Jcθ2/Jcz2) of the critical current density (Jcθ2) of the outer superconductor in the circumferential direction to a critical current density (Jcz2) of the outer superconductor in the axial direction.