Thermal and electrical design of superconducting demonstrator for magnetic density separation

Abstract In this paper the focus is on thermal and electrical design aspects of a NbTi-based demonstrator magnet for magnetic density separation (MDS) that being constructed at University Twente. MDS recycling technology allows non-magnetic particles based their mass density, using vertical field gradient ferrofluid. To minimize distance between planar array racetrack coils ferrofluid bath, system conduction-cooled. First presented, which shows can operate below 4.5 K with sufficient margin single cryocooler. High-purity aluminium heat drains enable low across cold mass. The current path introduced, as well adopted protection scheme. magnet’s stored energy safely be dumped in coils. Diodes are placed (anti-)parallel to prevent high terminal voltages. case quench superconducting part leads or an external anomaly, switch opened forced through resistor series diodes, causing deliberate transition normal state thus fast ramp-down.