High-Performance Bi-2212 Round Wires Made With Recent Powders

Jiang, J.; Bradford, Griffin; Hossain, S.; Brown, Michael D.; Cooper, Jonathan M.; Miller, Evan; Huang, Yibing; Miao, Hanping; Parrell, J.A.; White, Marvis; Hunt, Andrew; Sengupta, Suvankar; Revur, Rao; Shen, Tengming; Kametani, F.; Trociewitz, U.P.; Hellstrom, E. E.; Larbalestier, D. C.

doi:10.1109/tasc.2019.2895197

Cited by 67 publications

(75 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 4.2 K wire current density J E of the optimally processed strand used in this study is shown in Figure 1 28 . J E is greater than that of the HL-LHC RRP (Rod Restack Process) Nb 3 Sn strand above 11 T and it also has a much less field-sensitive characteristic, achieving 1365 A/mm 2 at 15 T, twice the target desired by the Future Circular Collider (FCC) for Nb 3 Sn strands 31 , and 1000 A/mm 2 at 27 T, 65% better than the previous record Bi-2212 performance 32 .…”

Section: The High Critical Current Density Of These Bi-2212 Wiresmentioning

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: The High Critical Current Density Of These Bi-2212 Wiresmentioning

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

Self Cite

View full text Add to dashboard Cite

show abstract

“…For Nb 3 Sn, the conductor properties for the High Luminosity LHC low-β quadrupole magnet is used [27]. The latest record performance for Bi-2212 round wire is from [28]. Three cable candidates are considered for REBCO, the Roebel cable [29], the CORC R wire [30] and the symmetric tape round (STAR) wire [31].…”

Section: Introductionmentioning

confidence: 99%

“…Other cable configurations such as twisted-stack [32] and exfoliated REBCO cable [33] may also be viable for accelerator magnet applications. [35] 26 [8] 105 [8] 110 [36] Upper critical field at 20 K T 0 0 9 [8] 100 [36] Typical wire diameter mm 1.065 [24] 0.85 [27] 0.80 [28] 12×1.5 [37] 3.7 [38] 1.3 [34] J e at 16 T, 4.2 K a A mm −2 0 474 [39] 1300 [28] 964 b [40] 310 c [38] 695 d [34] J e at 20 T, 4.2 K A mm −2 0 123 [39] 1180 [28] 821 b [40] 267 c [38] [43] 30 [38] 15 [34] Effective filament diameter f µm 7 [24] 55 [27] 130 [44] 2-5500 g [22] 2000 g [38] 1400-2500 g [34] Magnetization at 4.2 K, 1 T h mT 10 i [45] 270 [46] 60 [47] 716 j [48] 502 [49] TBD Strand transposition -Full Full Partial Peak heat treatment temperature…”

Section: Introductionmentioning

confidence: 99%

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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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Machine learning lattice parameters of monoclinic double perovskites

Zhang

2020

Int J of Quantum Chemistry

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Monoclinic double perovskites, such as A2B′B″O6, exhibit a wide range of unique electronic, magnetic, and optical properties, depending on the alloying elements, ordering, and lattice distortion. Four lattice constants, a, b, c, and β, can vary due to the ionic radii of alloying elements, which represent the compression, expansion, and tilting of octahedra in the crystal structure. In the current study, we develop the Gaussian process regression model to shed light on relationships between effective ionic radii and lattice constants for monoclinic double perovskites. The model is highly accurate and stable, contributing to fast, low‐cost estimations of lattice constants.

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High-Performance Bi-2212 Round Wires Made With Recent Powders

Cited by 67 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

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

Machine learning lattice parameters of monoclinic double perovskites

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