Influence of twist pitch on hysteretic losses and transport J c in overpressure processed high J c Bi-2212 round wires

Oz, Y.; Davis, D.; Jiang, J.; Hellstrom, E. E.; Larbalestier, D. C.

doi:10.1088/1361-6668/ac68a8

Influence of twist pitch on hysteretic losses and transport J _c in overpressure processed high J _c Bi-2212 round wires

Journal Article · Fri Apr 29 04:00:00 EDT 2022 · Superconductor Science and Technology

DOI:https://doi.org/10.1088/1361-6668/ac68a8· OSTI ID:1865205

; ; ; ;

Abstract

Bi-2212 is the only high field, high-temperature superconductor (HTS) available in the macroscopically isotropic, multifilament high J _c round wire (RW) form capable of generating high uniformity fields with minimum-screening current errors. However, the heat treatment that enables impressively high J _c (4.2 K, 30 T) values that can attain ∼5000 A mm ⁻² also produces significant filament bonding (bridging). Filament bridging appears to significantly enhance hysteretic losses of the filaments themselves by coupling neighboring, nominally independent filaments, enabling shielding currents to flow across multiple filaments as though they were one filament of much larger diameter. Wire twisting can be employed to reduce filament-to-filament eddy current coupling losses due to induced currents flowing across the matrix, but twisting is less effective in reducing increased losses from bridging. Here, we compare the twist-pitch dependence of the losses of overpressure processed (OP) high J _c Bi-2212 RWs with partially bridged filaments to those found in OP Bi-2212 RWs with discrete, not-bridged filaments. We show that filament sub-bundles in standard, partially-bridged wires that have some superconducting connections between filaments can exhibit significant coupling (much larger effective filament diameter), but twisting still reduces their hysteretic losses to values close to or below the ITER Nb ₃ Sn wire loss specification, even though Bi-2212 wires have significantly larger J _c values. Although it has been reported that twisting can reduce wire J _c by damaging filaments, we found no reduction in transport J _c , even for nominal twist pitches of 12 mm in 0.8 mm diameter wires. Evaluation of more-recent, higher J _c Engi-Mat powder wires showed that their reduced filament bridging and improved longitudinal connectivity significantly improved transport J _c and reduced the J _c normalized losses, signaling that J _c can be further improved without commensurate increase in losses. This important result strengthens the argument for production of high field, low loss HTS magnets made with Bi-2212 RWs.

View Journal Article

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

Grant/Contract Number:: SC0010421

OSTI ID:: 1865205

Alternate ID(s):: OSTI ID: 1863836
OSTI ID: 1979327

Journal Information:: Superconductor Science and Technology, Journal Name: Superconductor Science and Technology Journal Issue: 6 Vol. 35; ISSN 0953-2048

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United Kingdom

Language:: English

References (19)

Stability and AC losses in HTSC/Ag multifilamentary strands Collings, E. W.; Sumption, M. D. Applied Superconductivity, Vol. 3, Issue 11-12 https://doi.org/10.1016/0964-1807(95)00091-7	journal	November 1995
Determination of the true (or potential) transport-Jc of a multifilamentary Bi:HTSC/Ag strand in the presence of bridging and generalized sausaging Sumption, M. D.; Motowidlo, L. R.; Collings, E. W. Physica C: Superconductivity, Vol. 291, Issue 3-4 https://doi.org/10.1016/S0921-4534(97)01699-7	journal	December 1997
Isotropic round-wire multifilament cuprate superconductor for generation of magnetic fields above 30 T Larbalestier, D. C.; Jiang, J.; Trociewitz, U. P. Nature Materials, Vol. 13, Issue 4 https://doi.org/10.1038/nmat3887	journal	March 2014
Comparison of growth texture in round Bi2212 and flat Bi2223 wires and its relation to high critical current density development Kametani, F.; Jiang, J.; Matras, M. Scientific Reports, Vol. 5, Issue 1 https://doi.org/10.1038/srep08285	journal	February 2015
Reduction of interfilament contact loss in Nb ₃ Sn superconductor wires Goldfarb, R. B.; Itoh, K. Journal of Applied Physics, Vol. 75, Issue 4 https://doi.org/10.1063/1.356317	journal	February 1994
Filament to filament bridging and its influence on developing high critical current density in multifilamentary Bi ₂ Sr ₂ CaCu ₂ O _x round wires Shen, T.; Jiang, J.; Kametani, F. Superconductor Science and Technology, Vol. 23, Issue 2 https://doi.org/10.1088/0953-2048/23/2/025009	journal	December 2009
Bubble formation within filaments of melt-processed Bi2212 wires and its strongly negative effect on the critical current density Kametani, F.; Shen, T.; Jiang, J. Superconductor Science and Technology, Vol. 24, Issue 7 https://doi.org/10.1088/0953-2048/24/7/075009	journal	May 2011
A review of commercial high temperature superconducting materials for large magnets: from wires and tapes to cables and conductors Uglietti, D. Superconductor Science and Technology, Vol. 32, Issue 5 https://doi.org/10.1088/1361-6668/ab06a2	journal	April 2019
Investigation of transport mechanisms induced by filament-coupling bridges-network in Bi-2212 wires Angrisani Armenio, A.; Leveratto, A.; de Marzi, G. Superconductor Science and Technology, Vol. 35, Issue 3 https://doi.org/10.1088/1361-6668/ac45a0	journal	January 2022
RRR and thermal conductivity of Ag and Ag-0.2 wt.%Mg alloy in Ag/Bi-2212 wires Li, P.; Ye, L.; Jiang, J. IOP Conference Series: Materials Science and Engineering, Vol. 102 https://doi.org/10.1088/1757-899X/102/1/012027	journal	December 2015
Very-high thermal and electrical conductivity in overpressure-processed Bi ₂ Sr ₂ CaCu ₂ O _{8+ x} wires Bonura, M.; Avitabile, F.; Barth, C. Materials Research Express, Vol. 5, Issue 5 https://doi.org/10.1088/2053-1591/aabf51	journal	May 2018
Conundrum of strongly coupled supercurrent flow in both under- and overdoped Bi-2212 round wires Oz, Yavuz; Jiang, Jianyi; Matras, Maxime Physical Review Materials, Vol. 5, Issue 7 https://doi.org/10.1103/PhysRevMaterials.5.074803	journal	July 2021
Local measurement of current density by magneto-optical current reconstruction in normally and overpressure processed Bi-2223 tapes Patnaik, S.; Feldmann, D. M.; Polyanskii, A. A. IEEE Transactions on Appiled Superconductivity, Vol. 13, Issue 2 https://doi.org/10.1109/TASC.2003.812056	journal	June 2003
Reduced Magnetization and Loss in Ag–Mg Sheathed Bi2212 Wires: Systematics With Sample Twist Pitch and Length Myers, C. S.; Susner, M. A.; Miao, H. IEEE Transactions on Applied Superconductivity, Vol. 25, Issue 3 https://doi.org/10.1109/TASC.2014.2372614	journal	June 2015
Coupling Current and Hysteresis Losses of Bi2212 Round Wires With Twisted Filaments Yang, Yifeng; Pelegrin, J.; Young, E. A. IEEE Transactions on Applied Superconductivity, Vol. 25, Issue 3 https://doi.org/10.1109/TASC.2014.2373655	journal	June 2015
Hysteresis Losses and Effective J c (B)Scaling Law for ITER Nb 3 Sn Strands Seiler, E.; Richter, D.; Bordini, B. IEEE Transactions on Applied Superconductivity, Vol. 26, Issue 2 https://doi.org/10.1109/TASC.2016.2517200	journal	March 2016
High-Performance Bi-2212 Round Wires Made With Recent Powders Jiang, Jianyi; Bradford, Griffin; Hossain, S. Imam IEEE Transactions on Applied Superconductivity, Vol. 29, Issue 5 https://doi.org/10.1109/TASC.2019.2895197	journal	August 2019
Prediction of the J _C (B) Behavior of Bi-2212 Wires at High Field Brown, Michael D.; Jiang, Jianyi; Tarantini, Chiara IEEE Transactions on Applied Superconductivity, Vol. 29, Issue 5 https://doi.org/10.1109/TASC.2019.2899226	journal	August 2019
Critical Current Distributions of Recent Bi-2212 Round Wires Barua, Shaon; Davis, Daniel S.; Oz, Yavuz IEEE Transactions on Applied Superconductivity, Vol. 31, Issue 5 https://doi.org/10.1109/TASC.2021.3055479	journal	August 2021

Similar Records

Process to densify Bi₂Sr₂CaCu₂O_X round wire with overpressure before coil winding and final overpressure heat treatment

Journal Article · Mon Jan 06 23:00:00 EST 2020 · Superconductor Science and Technology · OSTI ID:1802107

Influence of twist pitch on hysteretic losses and transport J c in overpressure processed high J c Bi-2212 round wires

Citation Formats

References (19)

Similar Records

Related Subjects

Influence of twist pitch on hysteretic losses and transport J _c in overpressure processed high J _c Bi-2212 round wires