Experimental Study on Quench Protection of HTS Magnet Composed of Multiple Pancake-Coils by Use of Auxiliary Resistive Shunt Loop Method

In the authors' previous work, a new quench protection method to reduce hot-spot temperature and increase quench detection voltage was proposed to protect an HTS magnet composed of multiple pancake sub-coils from quench damages (Toriyama et al., 2019). In the method, a current of a quenching sub-pancake coil is transferred to the other sub-coils of the magnet forming auxiliary resistive shunt loop (ARSL) by resistively shorting the other sub-coils. In this work quench behaviors of the pancake sub-coils of a model magnet was investigated by a simulation experiment using small scale test pancake coils wound of YBCO wire. Current patterns of the sub-pancake coils of a model magnet at a quench event were calculated for the case that ARSL method was applied, and in the experiment, the same patterns of the calculated currents were applied to the quenching test coils by a controllable current supply. Experimental results show effectiveness of the new method.