A Novel Design of Multi-coil Magnet System for 100 T

For high magnetic field, the pulsed magnets are normally designed with multiple coils. However, the magnetic field produced by the outer coil starts to drop at the moment when the inner coil starts working due to the electromagnetic coupling. A novel scheme is proposed to eliminate the field drop by introducing compensation electromotive force in the coils. A triple-coil pulsed magnet and triple-coil transformer have been designed and manufactured. The inner, middle and outer coils of the magnet are connected in series with the inner, middle and outer windings of the compensation transformer, and are energized with capacitor banks and pulsed generator. Experimental results show that the magnetic field drop reduces from 8.5 T to 1.1 T. With a dual-coil magnet, the peak field of 94.8 T has been achieved. The simulations and experimental results prove the feasibility of the new scheme and the potential to produce 100 T.