Hardware:Magnet

The B0 field is created by a small 0.19T permanent magnet weighing about 13kg. The two N45M (NdFeB) rare-earth magnet disks are 15cm in diameter and held 4cm apart with an iron yoke, which also provides a flux-return path for the magnetic field, containing the magnetic field to the gap between the pole pieces (and inside the iron). The magnet was designed and constructed by the group of Prof. Yang Wenhui of the Institute of Electrical Engineering of the Chinese Academy of Sciences in Beijing. Design and construction was supervised by Wang Zheng. The CAS group also shimmed the magnet to ~50ppm homogeneity over 1cm DSV.