Patent ID: 6727699
Filing Date: 2004-04-27
Classification: G01R

Abstract:
A superconducting magnet system for magnetic spectroscopy of a sample, the system comprising:a substantially cylindrical cryostat having an axial room temperature bore for receiving the sample; a high frequency transmitter and detection system for exciting and detecting a signal of the sample; a superconducting main coil which is short-circuited during operation and which is located in a first radially inner region within said cryostat at a first low temperature, said main coil surrounding the sample in said room temperature bore and generating a homogeneous, temporally stable magnetic field at the sample location during operation which satisfies requirements for recording a high resolution magnetic resonance spectrum; and a superconducting drift compensation coil, said drift compensation coil disposed In a second radially outward region within said cryostat at a second higher temperature within said cryostat, said second higher temperature being greater than said first low temperature, wherein said drift compensation coil is superconductingly short-circuited during operation and said main coil and said drift compensation coil are designed such that, when said main coil drifts, said drift compensation coil recharges to keep said magnetic field at said sample sufficiently homogeneous and temporally constant.