Patent ID: 8222985
Filing Date: 2012-07-17
Classification: G01R,H01F

Abstract:
1. A superconducting magnet configuration with active shielding for generating a homogeneous magnetic field B o in an examination volume, the magnet configuration comprising: a radially inner superconducting main field coil which is disposed rotationally symmetrically about a z-axis and having an axial length L a superconducting shielding coil disposed coaxially and radially exterior to said main field coil, said shielding coil generating a magnetic field in the examination volume which is directed substantially opposite to a magnetic field generated by said main field magnet in the examination volume, said shielding coil having an axial length L a ferromagnetic field formation device disposed radially within said main field coil; and a ferromagnetic shielding body, said ferromagnetic shielding body surrounding said main field coil and said shielding coil in a radial and axial direction, wherein a combined axial magnetic field profile generated by said ferromagnetic field formation device and said ferromagnetic shielding body has a field strength maximum along said z-axis in said center of the examination volume and a field strength minimum on both sides of said center.