Design of a 14 T Actively Shielded Superconducting Magnet for Animal MRI

A 14 T actively shielded animal MRI magnet has been designed and is currently under construction. The magnet has a warm bore of 175 mm diameter and consists of Nb<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub>Sn and NbTi solenoid coils. This paper presents the results of electromagnetic, structural and quench protection designs of the magnet. The magnetic field homogeneity is 0.9 ppm within a 60 mm diameter of spherical volume. The distance of 5 Gauss line from the magnet center is 2.4 m radially and 2.9 m axially. Stress analysis shows that the maximum axial and circumferential stresses in the coils are −73 MPa and 144 MPa, respectively. Under the worst quench scenarios, the maximum hotspot temperature and inter-layer voltage in the coils are constrained to 169 K and 720 V, respectively.