Ehmler, H.; Kempfer, S.; Gerischer, S.; Dixon, I.; Smeibidl, P.: The quench detection system of the high field magnet at Helmholtz-Zentrum Berlin. IEEE Transactions on Applied Superconductivity 26 (2016), p. 4302804/1-4
10.1109/TASC.2016.2528993
Abstract:
A series-connected hybrid magnet for neutron scattering experiments has been installed and tested recently at the 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 Tesla. The quench detection system monitors the cable-in conduit coil, the NbTi bus and the HTS current leads. The total detection system consists of a main and an auxiliary device which have been developed and fabricated by two different suppliers. The main device consists of 16 voltage detection units. Each unit can either monitor a single voltage or a difference of two voltages with a common mid-point. The auxiliary device represents a redundant detection unit for the CICC coil incorporating the differential signal from the co-wound wire. Results of a quench at 19.1 kA detected with both systems are shown.