Speaker
Description
High-temperature superconductors (HTS), with their appreciable current density and superior thermal stability, exhibit significant potential for high-field applications. Compared to the normal zone propagation velocity (NZPV) of low-temperature superconductors (LTS), the NZPV in HTS is typically two to three orders of magnitude slower than that in LTS. The slow quench propagation significantly complicates quench detection.The same issue will also arise in stacked superconducting tapes, which are the fundamental components of HTS cable-in-conduit-conductors (CICCs).Fiber Bragg Grating (FBG) sensors have been used widely for temperature measurement and have shown promise as cryogenic temperature sensors for quench detection of HTS tapes. This paper investigates quench detection based on Fiber Bragg Gratings (FBGs).A multiplexed fiber Bragg grating sensor with multiple gratings is adhered to a 4 mm-wide stacked superconducting tape using 2850FT. Thermocouples are arranged on the same side to synchronously measure the temperature distribution during a quench induced by a heater. On the opposite side, voltage taps are installed to compare the voltage and temperature distributions during the quench process.Experimental results demonstrate that the FBG can rapidly detect the temperature change when the quench occurs.
Acknowledge
This work is supported by the National Natural Science Foundation of China under
Grant 52307036 and National Key R & D Program of China under Grant 2024YFA1613300.
