Superconducting magnet with increased thermal stability

摘要

The invention relates to a superconducting magnet for MRI devices and to MRI devices comprising that magnet. The invention utilizes the characteristic of superconducting coils (1) that they have high thermal conductivity in the direction of winding. A part of the superconducting coils (1) is thermally connected with liquid helium (5) through thermal anchors (4a, 4b) so that the part of the superconducting coils (1) can be cooled to the liquid helium temperature. This cooling structure maintains thermal stability of a superconducting MRI magnet even in a condition that a refrigerator stops for a certain period of time, and reduces the manufacturing cost of the superconducting magnet. <IMAGE>