Apparatus for Quench Protection and Stabilizing Decay in a Quasi-persistent Superconducting Magnet

A superconducting magnet assembly comprising a superconducting magnet which, under working conditions, generates a magnetic field in a working volume, the superconducting magnet being connected in parallel with a series combination of a superconducting fault current limiter and a resistor and being further connected in parallel with a protection resistor,

• the superconducting magnet assembly further comprising connection means for further connection of the magnet in parallel with a DC power source whereby under working conditions, the magnet is energized by such a power source to generate the desired magnetic field in the working volume and whereby, under quench conditions, the superconducting fault current limiter becomes resistive and current flows through the protection resistor, to provide dissipation of energy from the magnet.