Conceptual Cooling Design for 14T MRI Superconducting Magnet System

At present, Ultra-high field MRI system is considered the right way to explore the human brain because of the brain activity would be seen at a resolution of hundreds of micrometers. In 2017, the Chinese government launched an ambitious project to design and manufacture a 14T MRI system to support neuroscience research in future. The superconducting magnets made of Nb3Sn superconductor and NbTi superconductor is designed to generate a homogeneous field of 14 T with a warm bore of 900 mm. In order to ensure the magnet could be operated safely and stability with a higher temperature margin, the superconducting magnet system include a main coil made of Nb3Sn superconductor and shielding coils made of NbTi superconductor which will be immersed and cooled by the sub-cooled helium. In this paper, the concept design of the low-temperature structural and the cryogenic system will be introduced.