Calculation of Nb3Sn superconducting magnet´s inductance and distribution of electromagnetic force

The electromagnetic force distribution of Nb₃Sn superconducting magnet is analyzed and obtained when the magnet is in the maximum magnetic field, then the request of magnet´s structural strength is offered. Next, three methods of calculating the coil inductance are presented which are flux method, energy method and classical formula method. Adopting the above three methods, we calculate the coil inductance separately, obtaining accurate and consistent results . This would provide useful parameter for the quench protection of magnet.