Experimental Study of the Nb3Sn-Embedded Quench Detection Module for HTS Magnets

Abstract

Detection and protection of quenches in REBCO-based solenoids, particularly those using 2G wires, is a challenging engineering task due to the high current density these materials provide at high magnetic fields. This enables coils with greater magnetic energy density but requires faster protection responses, as minimal copper is used to keep designs compact. The slow normal zone propagation in coated conductors complicates quench detection using traditional voltage taps, presenting both a challenge and an opportunity to explore alternative methods. To address this, we propose a practical Nb₃Sn-embedded quench detection module for quench and hotspot detection in 2G wires by sensing local temperature increases, leveraging the critical characteristics of Nb₃Sn. The module was tested to evaluate the detection characteristics based on operating current, temperature, and heat generation, then it was confirmed its sensitivity, reliability, and feasibility for rapid quench detection.