Quench detection and protection system design and analysis of the 7 T superconducting magnet

A NbTi 7 T superconducting magnet with a 338 mm bore system was rebuilt and the first experiment was carried out in Jan.2009.The balancing-bridge method used for the quench detection system is analyzed and an improvement of the principle of balancing-bridge conformation is given.The inductances of the coils are calculated to estimate the proportion of the bridge arms.The appropriate parameters are selected for the balancing-bridge.