Very-high thermal and electrical conductivity in overpressure-processed Bi2Sr2CaCu2O8+x wires

Bonura, Marco; Avitabile, Francesco; Barth, C.; Jiang, J.; Larbalestier, D. C.; Fête, Alexandre; Leo, Antonio; Bottura, L.; Senatore, Carmine

doi:10.1088/2053-1591/aabf51

Cited by 14 publications

(14 citation statements)

References 20 publications

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“…The feasible quench detection and possible quench-free operation for standalone Bi-2212 magnets enables magnet use of the unique characteristics so far only found in Bi-2212, a combination of high stability that comes with high-T c cuprate superconductors, isotropic behavior due to the round, multifilamentary wire architecture, and the ability to produce long wires and cables with high uniformity and current sharing. With these capabilities, Bi-2212 has taken a huge step towards practical applications such as user-friendly, [25][26][27][28][29][30] T class solenoid research magnets 42 , 20-T class, canted cosine theta geometry 43,44 , accelerator magnets useful for future high-energy colliders, including a high-energy LHC upgrade, and >1.3 GHz NMR magnets due to Bi-2212 being the only isotropic, multifilamentary HTS round wire that permits high magnetic field quality. holding steps during which coil inductive signals die away and noise is much reduced b.…”

Section: Discussionmentioning

confidence: 99%

“…The Bi-2212 filling factor of the as-drawn wire is ~25% and porosity occupies roughly 30% of the filament cross-section as delivered. The matrix Ag surrounding the filaments has a very high electrical conductivity as judged by a resistance ratio >100 and very high thermal conductivity 29,30 . 17-strand Rutherford cables were made at LBNL with a width of 7.8 mm and a thickness of 1.44 mm.…”

Section: Wire and Cable Design And Fabricationmentioning

confidence: 99%

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Stable, predictable and training-free operation of superconducting Bi-2212 Rutherford cable racetrack coils at the wire current density of 1000 A/mm2

Shen

Bosque

Davis

et al. 2019

Sci Rep

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High-temperature superconductors (HTS) could enable high-field magnets stronger than is possible with Nb-Ti and Nb 3 Sn, but two challenges have so far been the low engineering critical current density J E , especially in high-current cables, and the danger of quenches. Most HTS magnets made so far have been made out of REBCO coated conductor. Here we demonstrate stable, reliable and training-quench-free performance of Bi-2212 racetrack coils wound with a Rutherford cable fabricated from wires made with a new precursor powder. These round multifilamentary wires exhibited a record J E up to 950 A/mm 2 at 30 T at 4.2 K. These coils carried up to 8.6 kA while generating 3.5 T at 4.2 K at a J E of 1020 A/mm 2 . Different from the unpredictable training performance of Nb-Ti and Nb 3 Sn magnets, these Bi-2212 magnets showed no training quenches and entered the flux flow state in a stable manner before thermal runaway and quench occurred. Also different from Nb-Ti, Nb 3 Sn, and REBCO magnets for which localized thermal runaways occur at unpredictable locations, the quenches of Bi-2212 magnets consistently occurred in the high field regions over a long conductor length. These characteristics make quench detection simple, enabling safe protection, and suggest a new paradigm of constructing quench-predictable superconducting magnets from Bi-2212.

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Section: Discussionmentioning

confidence: 99%

Section: Wire and Cable Design And Fabricationmentioning

confidence: 99%

Stable, predictable and training-free operation of superconducting Bi-2212 Rutherford cable racetrack coils at the wire current density of 1000 A/mm2

Shen

Bosque

Davis

et al. 2019

Sci Rep

View full text Add to dashboard Cite

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“…It can also be rolled into a rectangular form, retaining the isotropic superconducting properties when the aspect ratio is lower than 1.6 [35]. The Ag matrix surrounding the filaments has a very high electrical conductivity as judged by a residual-resistivity ratio (RRR) > 100 and very high thermal conductivity [36,37], despite not surrounding the superconductor filaments with diffusion barriers to prevent superconductor filaments from poisoning the metal matrix such as Cu/Nb-Ti and Cu/Nb 3 Sn wires.…”

Section: The Development Of Bi-2212 Into a Magnet-grade Conductor: Ma...mentioning

confidence: 99%

Superconducting Accelerator Magnets Based on High-Temperature Superconducting Bi-2212 Round Wires

Shen

Fajardo

2020

Instruments

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Superconducting magnets are an invaluable tool for scientific discovery, energy research, and medical diagnosis. To date, virtually all superconducting magnets have been made from two Nb-based low-temperature superconductors (Nb-Ti with a superconducting transition temperature Tc of 9.2 K and Nb3Sn with a Tc of 18.3 K). The 8.33 T Nb-Ti accelerator dipole magnets of the large hadron collider (LHC) at CERN enabled the discovery of the Higgs Boson and the ongoing search for physics beyond the standard model of high energy physics. The 12 T class Nb3Sn magnets are key to the International Thermonuclear Experimental Reactor (ITER) Tokamak and to the high-luminosity upgrade of the LHC that aims to increase the luminosity by a factor of 5–10. In this paper, we discuss opportunities with a high-temperature superconducting material Bi-2212 with a Tc of 80–92 K for building more powerful magnets for high energy circular colliders. The development of a superconducting accelerator magnet could not succeed without a parallel development of a high performance conductor. We will review triumphs of developing Bi-2212 round wires into a magnet grade conductor and technologies that enable them. Then, we will discuss the challenges associated with constructing a high-field accelerator magnet using Bi-2212 wires, especially those dipoles of 15–20 T class with a significant value for future physics colliders, potential technology paths forward, and progress made so far with subscale magnet development based on racetrack coils and a canted-cosine-theta magnet design that uniquely addresses the mechanical weaknesses of Bi-2212 cables. Additionally, a roadmap being implemented by the US Magnet Development Program for demonstrating high-field Bi-2212 accelerator dipole technologies is presented.

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“…• C N/A 665 [27] 892 [50] N/A Irreversible tensile strain limit ->1% [51] 0.4% [52] 0.3% [53,54] 0.36% [55] 0.85% [56] TBD Irreversible transverse stress limit MPa >200 [24] 150-260 [57,58] 60-TBD [59] 370-440 [37] 99 k [60] TBD Stabilizer fraction -62% [24] 55% [27] 78% [61] 20% [37] 57% l [38] 17% l [34] Stabilizer RRR -200 [24] ≥150 [27] 90-440 [61,62] 13-69 m [63,64] g When the magnetic flux lines are in parallel with the broad surface of the REBCO tape, the REBCO layer thickness becomes the characteristic length scale for an effective filamnet size.…”

Section: Introductionmentioning

confidence: 99%

Dipole Magnets above 20 Tesla: Research Needs for a Path via High-Temperature Superconducting REBCO Conductors

2019

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To enable the physics research that continues to deepen our understanding of the Universe, future circular colliders will require a critical and unique instrument—magnets that can generate a dipole field of 20 T and above. However, today’s maturing magnet technology for low-temperature superconductors (Nb-Ti and Nb 3 Sn) can lead to a maximum dipole field of around 16 T. High-temperature superconductors such as REBCO can, in principle, generate higher dipole fields but significant challenges exist for both conductor and magnet technology. To address these challenges, several critical research needs, including direct needs on instrumentation and measurements, are identified to push for the maximum dipole fields a REBCO accelerator magnet can generate. We discuss the research needs by reviewing the current results and outlining the perspectives for future technology development, followed by a brief update on the status of the technology development at Lawrence Berkeley National Laboratory. We present a roadmap for the next decade to develop 20 T-class REBCO accelerator magnets as an enabling instrument for future energy-frontier accelerator complex.

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Very-high thermal and electrical conductivity in overpressure-processed Bi₂Sr₂CaCu₂O_8+x wires

Abstract: Materials Research Express PAPER Very-high thermal and electrical conductivity in overpressure-processed Bi 2 Sr 2 CaCu 2 O 8+x wires To cite this article: M Bonura et al 2018 Mater. Res. Express 5 056001 View the article online for updates and enhancements.

Cited by 14 publications

References 20 publications

Stable, predictable and training-free operation of superconducting Bi-2212 Rutherford cable racetrack coils at the wire current density of 1000 A/mm2

Stable, predictable and training-free operation of superconducting Bi-2212 Rutherford cable racetrack coils at the wire current density of 1000 A/mm2

Superconducting Accelerator Magnets Based on High-Temperature Superconducting Bi-2212 Round Wires

Dipole Magnets above 20 Tesla: Research Needs for a Path via High-Temperature Superconducting REBCO Conductors

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