Critical Current Distributions of Recent Bi-2212 Round Wires

Barua, Shaon; Davis, Daniel S.; Oz, Yavuz; Jiang, Jianyi; Hellstrom, Eric E.; Trociewitz, Ulf P.; Larbalestier, David C.

doi:10.1109/tasc.2021.3055479

Critical Current Distributions of Recent Bi-2212 Round Wires

Journal Article · Fri Jan 29 04:00:00 EST 2021 · IEEE Transactions on Applied Superconductivity

DOI:https://doi.org/10.1109/tasc.2021.3055479· OSTI ID:1824702

^[1]; Davis, Daniel S. ^[2]; Oz, Yavuz ^[2]; ^[2]; ^[2]; Trociewitz, Ulf P. ^[2]; ^[2]

Florida State Univ., Tallahassee, FL (United States); ASC/FSU/NHMFL
Florida State Univ., Tallahassee, FL (United States)

Bi₂Sr₂CaCu₂O_8+x (Bi-2212) is the only high-field, high-temperature superconductor (HTS) capable of reaching a critical current density J_c(16 T, 4.2 K) of 6500 A·mm^–2 in the highly desirable round wire (RW) form. However, state-of-the-art Bi-2212 conductors still have a critical current density (J_c) to depairing current density (J_d) ratio around 20 to 30 times lower than that of state-of-the-art Nb–Ti or REBCO. Previously, we have shown that recent improvements in Bi-2212 RW J_c are due to improved connectivity associated with optimization of the heat treatment process, and most recently due to a transition to a finer and more uniform powder manufactured by Engi-Mat. One quantitative measure of connectivity may be the critical current (I_c) distribution, since the local I_c in a wire can vary along the length due to variable vortex-microstructure interactions and to factors such as filament shape variations, grain-to-grain connectivity variations and blocking secondary phase distributions. Modeling the experimental V-I transition measured on a low resistance shunt as a complex sum of voltage contributions of individual filament and wire sub-sections allows a numerical extraction of the I_c distribution from the d²V/dI² treatment of the V-I curves. Here we compare ~0.1 m length I_c distributions of Bi-2212 RWs with recent state-of-the-art very high-J_c Engi-Mat powder and lower J_c and older Nexans granulate powder. We do find that the I_c spread for Bi-2212 wires is about twice the relative standard of high-J_c Nb–Ti well below H_irr. We do not yet see any obvious contribution of the Bi-2212 anisotropy to the I_c distribution and are rather encouraged that these Bi-2212 round wires show relative I_c distributions not too far from high-J_c Nb–Ti wires.

View Accepted Manuscript (DOE)

Research Organization:: Florida State Univ., Tallahassee, FL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)

Grant/Contract Number:: SC0010421

OSTI ID:: 1824702

Journal Information:: IEEE Transactions on Applied Superconductivity, Journal Name: IEEE Transactions on Applied Superconductivity Journal Issue: 5 Vol. 31; ISSN 1051-8223

Publisher:: IEEECopyright Statement

Country of Publication:: United States

Language:: English

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