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The Quench Detection System of the High-Field Magnet at Helmholtz-Zentrum Berlin

A series-connected hybrid magnet for neutron scattering experiments has been installed at Helmholtz-Zentrum Berlin. The magnet consists of a superconducting Nb3Sn cable-in-conduit coil and a resistive Bitter magnet with a total maximum field of 26.3 T. The quench detection system monitors the cable-in-conduit coil, the NbTi bus, and the HTS current leads. The total detection system consists of two independent parts, i.e., a main system and an auxiliary system, which have been developed and fabricated by two different suppliers. The main system consists of 16 voltage detection units. Each unit can either monitor a single voltage or a difference of two voltages with a common midpoint. The auxiliary system represents a redundant detection unit for the CICC coil, incorporating the differential signal from a cowound wire. Results of a quench detected with both systems are shown.