MAGNET SYSTEM

There is provided a magnet system for generating a homogeneous magnetic field in a target region. The magnet system comprises: a first magnet formed from low temperature superconductor, LTS, material wound so as to define a central axis, the first magnet being arranged in use to generate a first magnetic field in the target region located upon the central axis, the first magnetic field having a first level of homogeneity; and a second magnet formed from high temperature superconductor, HTS, material and arranged in use to generate a second magnetic field in the target region, the second magnetic field having a second level of homogeneity. The first level of homogeneity of the first magnetic field is up to 10 parts per million, ppm, and the second level of homogeneity of the second magnetic field is up to 10 ppm, the combination of the first and second magnetic fields in the target region generating in use a resultant magnetic field having a resultant homogeneity of up to 10 ppm, and the first magnet and second magnet are independent current circuits.