Quench Behaviors of Monofilament Iron-Based Sr_0.6K_0.4Fe₂As₂Tape With Ag Sheath at Different Temperatures

Abstract

For practical application, stability investigations of Sr0.6K0.4Fe2As2 conductors are of great importance. In this paper, quench development and propagation in Ag-sheathed are investigated experimentally and numerically. Measurements are performed as a function of transport current for several operating temperatures between 19 and 35 K. The work focuses on the evaluation of quench development, and the estimation of normal zone propagation velocity (NZPV) and minimum quench energy (MQE). The experimentally obtained temperature dependence of NZPV is compared with a simplified adiabatic model. Also, the NZPV and the MQE of the sample are compared with those of a low-temperature superconductor (LTS) and a high-temperature superconductor (HTS). According to the results, the basic quench characteristics fit between those of LTS and HTS materials.

Recent breakthrough development in iron-based superconducting wires for practical applications

“…Similarly, it can be seen that, for the Ag/BSCCO tapes, the monofilament tapes have a sharper rise in voltage traces and temperature traces than the multifilament types. The NZPV of the Sr-122/Ag tape is reported in the range of 0.7-2.2 cm s −1 [107], which is of the same order as high-T c cuprate superconductors. For example, the NZPV of the Bi-2223/Ag monofilament tape at the operation temperature of 20 K to30 K is about 1 cm s −1 , and the NZPV of the REBCO and Bi-2223 tapes is between 0.6 and 2.5 cm s −1 at 40 K for an I op /I c ratio varying from 0.3 to 0.7 [108,109].…”

“…In practical applications, it is important to understand quench behavior at different operating temperatures, and it is necessary to investigate the two main parameters, namely, normal zone propagation velocity (NZPV) and minimum quench energy (MQE), for designing quench protection systems. Measurements of critical currents and quench behavior of a monofilament Agsheathed Sr-122 tape were performed from 19 K to 35 K as a function of transport currents and operating temperatures [107]. Normal zone propagation was observed for the first time for 122-IBS tapes.…”

“…The experimental MQE values range typically from 0.556 J to 2.4 J for the Ag-sheathed Sr-122 tape samples (single-core, 3.55 mm wide and 0.43 mm thick) from 22 K to 30 K [107]. It was reported that the MQE at 4.2 K is less than 1 mJ, measured for varying I op /I c for Nb-Ti, and the same order of MQE was measured for Nb 3 Sn conductors [110,111].…”

Investigation of normal zone propagation velocity in AgSn/Ag/Ba122 superconducting tapes using a conduction cooling test system

“…Until now, there has been limited research on the quench propagation properties of IBSs. In 2016, Liu et al conducted measurements on the quench propagation in a 8 cm-long Ag-sheathed Sr-122 tape using conduction cooling [20]. The experimental results show that the NZPV ranged from 0.8 to 2.2 cm s −1 at temperatures between 22 and 30 K. In 2021, Ding et al tested the quench behavior of Sr/Ba122 tape in liquid helium [21].…”