The inductive quench propagation in a NbTi-magnet as the dominating effect for the transient current distribution in a NbTi-Nb3Sn hybrid magnet

The transient behaviour of a NbTi-Nb3Sn hybrid magnet after a quench was investigated. The NbTi-coil showed a fast decay time of the magnet current due to an inductive quench propagation mechanism. High internal voltages were the consequence of the graded current density. In the magnet system, protected by shunt resistors, the NbTi-coil became the dominating part in the transient events due to the fast development of internal resistance and the resulting fast field decay.