Patent ID: 6670878
Filing Date: 2003-12-30
Classification: G01R

Abstract:
A magnetic system comprising a superconducting magnet coil system for generating a magnetic field in a direction of a z axis in a working volume disposed about z=0, the system comprising:means for generating a first homogeneous field in the working volume using a radially inner partial coil means; means for generating, per se, an inhomogeneous field in the working volume using a radially outer coil means coaxial to said inner coil means; and means for producing, together with said outer coil means, a second homogeneous field in the working volume using a field forming device of magnetic material disposed radially between said inner and said outer coil means and coaxial with respect to said inner coil means and said outer coil means, wherein said magnetic material of said field forming device is substantially magnetically saturated, and a magnetization of said field forming device points substantially parallel or anti-parallel to the z axis.