Patent ID: 8305173
Filing Date: 2012-11-06
Classification: G01R,H01F,Y10T

Abstract:
1. A superconductive magnet comprising: a first group of coils serving as main coils for generating a magnetic field; and a second group of coils serving as shield coils that are arranged coaxially with the first group of coils and generate a magnetic field whose direction is opposite the direction of a magnetic field generated by the first group of coils so that a magnetic field that leaks outside from the first group of coils is cancelled, wherein when a center of a region where a magnetic field is generated by the first group of coils is an origin, the second group of coils are arranged along a longitudinal axis of said superconductive magnet, within axis-direction positions unoccupied by the first group of coils, such that a ratio of the axis-direction coordinates of the most distal end of the second group of coils from the origin and the most distal end of the first group of coils from the origin ranges from 0.63 to 0.87.