The magnet is a superconducting solenoid. It consists of 37700 niobium titanium windings (bore 60 cm, stroke 1 m), and has a self-inductance of 534 Henrys. At full-field strength, the central field is 7.92 Tesla, and the energy stored in the magnetic field is about 15 MJoules. By comparison, the world's largest stored-energy magnet as of 5 years ago was made by Oxford Instruments, with stored-energy of 27 MJoules. A sample technical drawing of the magnet coils is shown in the following link.