DEACTIVATION DETECTION IN HTS MAGNETS WITH LTS WIRES - THEORETICAL AND NUMERICAL ANALYSIS BASIC CONCEPTS
Keywords:Quench, LTS quench detector, High temperature superconductors, normal zone
Protecting a high temperature superconducting (HTS) magnet from a quench event is a challenging task. Because of the slow normal zone propagation velocity, the detection method by directly monitoring coil voltage may not be timely for HTS anymore, leaving HTS magnets under danger of overheating. Using a low temperature superconducting (LTS) wire to detect quench in coils wound with tapes have recently been experimentally proved, yet a theoretical study is still needed to further develop this technique and make it prepared to be applied more generally in high field magnets. In this manuscript, we have demonstrated that it is the significant difference in the temperature dependence of critical current between LTS and HTS but not the normal zone propagation velocity (NZPV), that makes LTSs good quench detectors. Simulations show that LTS quench detectors should have low matrix fraction or high matrix resistivity. At last, at field up to 15 T or 20 T, is proven to be a good quench detector.
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