HIGH RESOLUTION MAGNETORESONANCE SPECTROSCOPIC MAGNET APPARATUS HAVING SUPERCONDUCTING MAGNET COIL SYSTEM AND MAGNETIC FIELD FORMING DEVICE AND METHOD OF DETERMINING MANUFACTURING ALLOWANCE THEREABOUT

摘要

PROBLEM TO BE SOLVED: To enough compensate the influence of the manufacturing allowance on a magnetic field forming in a work volume of a magnetic forming device composed of a magnetic substance having an adequate geographical shape in a high resolution resonance spectroscopic magnetic apparatus.;SOLUTION: A superconducting magnet for generating a magnetic field in a direction of the (z) axis in a work volume (AV) disposed with center at z=0 on the (z) axis forms a magnetic coil system (C) in a work volume. Its magnetic field has at least one nonuniformly contributing component H_n.zⁿ(n≥2) to the total magnetic field strength on the (z) axis with center at z=0, varying exponentially as zⁿ and a magnetic field forming device (P) composed of a magnetic substance at least in cylindrical symmetric shape with respect to the (z) axis has at least one additional coil system (S) which has a radial distance of less than 80 mm from the x axis, compensates the one nonuniformly magnetic field contributing component H_n.zⁿ at least 50% in the magnet coil system (C), and acts as a seam device.;COPYRIGHT: (C)2002,JPO