Patent ID: 6060971
Filing Date: 2000-05-09
Classification: C30B,H01F,Y10S

Abstract:
A superconducting magnet device for a crystal pulling device, comprising:a pair of ring-like main superconducting coils facing each other with respect to the axial direction, with the crystal pulling device disposed therebetween;a radiation shield surrounding the main superconducting coils;a vessel surrounding the radiation shield; andauxiliary coils configured to generate a magnetic field in an opposite direction with respect to a magnetic field of the main superconducting coils;wherein the vessel includes an outer plate made from a magnetic substance, and a conductor center of the auxiliary coils exists in a range formed by a first line and a second line;the first line linked by an intersection point defined by a symmetrical axis and a central axis of said pair of main superconducting coils and a symmetrical axis side corner part on an outer diameter part of at least one main superconducting coil; andthe second line linked by said intersection point and a corner part receded from the symmetrical axis side corner part on an inner diameter part of said at least one main superconducting coil.