Speaker
Liyang Ye
(Fermi National Accelerator Laboratory)
Description
One of the remaining challenges for high temperature superconducting magnets is quench protection. To develop an effective quench protection system, it is important to understand the conditions that must be avoided during a quench so that the conductor is not degraded. Our previous study on Ag/Bi2212 round wires has shown that the quench degradation is a strain-driven effect and strongly depends on the hotspot temperature, *T*quench, during the quench; critical current *I*c of Bi-2212 wires gradually degraded irreversibly when *T*quench exceeds 350-500 K, above which *I*c of Bi-2212 dropped quickly to zero. Here, similar quench experiments are performed on commercial REBCO coated conductors from Superpower and CT-OP Bi2223 tapes from Sumitomo. REBCO coated conductor has a Hastelloy substrate whereas Bi-2223 tapes include bare tapes, tapes reinforced with stainless steel and Ni-Cr. The dependence of their *I*c on *T*quench will be determined for various test setups, for example with or without epoxy impregnation. Microstructure of the degraded samples will be investigated using optical and electron microscopy to further reveal the degradation mechanism at microscopic level.
*This work is supported by the U.S. Department of Energy, Office of High Energy Physics through a FY12 early career award.*
Primary author
Liyang Ye
(Fermi National Accelerator Laboratory)
Co-authors
Justin Schwartz
(NC State University)
Mattia Duranti
(Fermi National Accelerator Laboratory)
Pei Li
(Fermi National Accelerator Laboratory)
Tengming Shen
(Fermilab)
