Quench degradation limit of multifilamentary AgBi2Sr2CaCu2Ox round wires

Ye, Liyang; Li, Pei; Shen, Tengming; Schwartz, Justin

doi:10.1088/0953-2048/29/3/035010

Title: Quench degradation limit of multifilamentary AgBi₂Sr₂CaCu₂O_x round wires

Journal Article · Tue Feb 02 00:00:00 EST 2016 · Superconductor Science and Technology

DOI:https://doi.org/10.1088/0953-2048/29/3/035010· OSTI ID:1258288

Ye, Liyang ^[1]; Li, Pei ^[2]; Shen, Tengming ^[2]; Schwartz, Justin ^[3]

Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); North Carolina State Univ., Raleigh, NC (United States)
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
North Carolina State Univ., Raleigh, NC (United States)

Understanding safe operating limits of composite superconducting wires is important for the design of superconducting magnets. Here we report measurements of quench-induced critical current density Jc degradation in commercial Ag/Bi₂Sr₂CaCu₂O_x (Bi-2212) round wires using heater-induced quenches at 4.2 K in self magnetic field that reveal a general degradation behavior. J_c degradation strongly depends on the local hot spot temperature T_max, and is nearly independent of operating current, the temperature gradient along the conductor dT_max/dx, and the temperature rising rate dT_max/dt. Both J_c and n value (where n is an index of the sharpness of the superconductor-to-normal transition) exhibit small but irreversible degradation when T_max exceeds 400-450 K, and large degradation occurs when Tmax exceeds 550 K. This behavior was consistently found for a series of Bi-2212 wires with widely variable wire architectures and porosity levels in the Bi-2212 filaments, including a wire processed using a standard partial melt processing and in which Bi-2212 filaments are porous, an overpressure processed wire in which Bi-2212 filaments are nearly porosity-free and that has a J_c(4.2 K, self field) exceeding 8000 A/mm², and a wire that has nearly no filament to filament bridges after reaction. Microstructural observations of degraded wires reveal cracks in the Bi-2212 filaments perpendicular to the wire axis, indicating that the quench-induced I_c degradation is primarily driven by strain. These results further suggest that the quench degradation temperature limit depends on the strain state of Bi-2212 filaments and this dependence shall be carefully considered when engineering a high-field Bi-2212 magnet.

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Research Organization:: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-07CH11359

OSTI ID:: 1258288

Alternate ID(s):: OSTI ID: 1236650

Report Number(s):: FERMILAB-PUB-16-216-TD; 1469367

Journal Information:: Superconductor Science and Technology, Vol. 29, Issue 3; ISSN 0953-2048

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 12 works

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Numerical simulation of quench initiation and propagation in multi-filamentary Bi ₂ Sr ₂ CaCu ₂ O _x round wires at high magnetic fields Jiang, Zhao-Fei; Gou, Xiao-Fan; Shen, Teng-Ming Journal of Applied Physics, Vol. 125, Issue 16 https://doi.org/10.1063/1.5086950	journal	April 2019

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