Effect of Background Magnetic Field on Quench Properties in REBCO and Bi-2223 Tapes

Quench propagation characteristics are the key issue for high temperature superconductor (HTS) cables and magnets. In this work, the effect of magnetic field on minimum quench energy (MQE) and the normal zone propagation velocity (NZPV) of two types of HTS tapes, including Bi-2223 and REBCO, are studied by experimental method in 77 K, respectively. The equivalent heat capacity of the two tapes was used to evaluate the MQE property. The experimental results show that the MQE of HTS tape is sensitive to the magnetic field, whereas the NZPV of HTS tape shows less sensitivity to the magnetic field. Although the volume heat capacity of REBCO tape and Bi-2223 tape is similar, the equivalent heat capacity of samples shows a higher difference and leads to the lower MQE for REBCO tape. It is also shown that the NZPV of Bi-2223 tape is smaller than that of REBCO tape.