Exfoliated YBCO filaments for second-generation superconducting cable

Solovyov, Vyacheslav; Farrell, Paul

doi:10.1088/0953-2048/30/1/014006

Cited by 27 publications

(12 citation statements)

References 18 publications

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“…However, by using this characteristic, superconducting layers can be easily separated from the REBCO wires and finally an MHOS conductor can be fabricated by repeatedly stacking the superconducting layers. A silver diffusion bonding method rather than the conventional soldering method was used to bond the superconducting layers, wherein the silver layer was coated on the superconducting layer in advance [19,20]. The advantage of this technique is that it prevents the delamination of superconducting layers by reheating such as the joints of superconducting wires.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of 1 m long multi layered superconducting coated conductor with high engineering critical current density

Kim

Noh

et al. 2020

Supercond. Sci. Technol.

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Cable conductors fabricated by bundling coated conductors to increase the transport current have been developed for large-scale electric applications such as highly magnetic field magnets, large accelerators and fusion reactors. Various types of cable conductors (CORC cables, Roebel cables, TSTC and round wires) have been fabricated using coated conductors; however, these cable conductors do not have a high engineering critical current density (J e ) required high performance in large-scale applications. In this study, new high temperature superconducting (HTS) multilayered conductors have been fabricated to increase the critical current and J e of coated conductors as cable conductors. The property of easy exfoliation owing to the weak c-axis strength of coated conductors is used to fabricate multi layered HTS conductors. In order to stack and bond multiple-HTS layers on one substrate (MHOS), a silver diffusion bonding technique using only a silver plated coated conductor is adopted. The MHOS conductor consists of multiple, biaxial-, textured, superconducting layers without any intermediate epitaxial grown buffer layer or solder layer between them. A 1 m long 4-MHOS conductor was successfully fabricated to proposed fabrication process; it exhibited a high critical current (2484 A/12 mm-w) and high engineering critical current density (J e =0.12 MA cm −2 ). The critical current of the fabricated MHOS conductor at liquid nitrogen temperature (65-77 K) with a magnetic field ranging from 0 to 6 T increased proportionally with the number of superconducting layers.

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Section: Introductionmentioning

confidence: 99%

Fabrication of 1 m long multi layered superconducting coated conductor with high engineering critical current density

Kim

Noh

et al. 2020

Supercond. Sci. Technol.

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“…Three cable candidates are considered for REBCO, the Roebel cable [29], the CORC R wire [30] and the symmetric tape round (STAR) wire [31]. 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%

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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“…1 (c)). An arc radius of 10 mm was applied between the top/bottom and the sidewall surfaces to avoid excess bending stress on the tapes [26]. A joint mechanism for the twelve separated cavity pieces was designed for accurate alignment of the YBCO tapes upon assembly.…”

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confidence: 99%

First prototype of a biaxially textured YBa$_{2}$Cu$_{3}$O$_{7-x}$ microwave cavity in a high magnetic field for dark matter axion search

Ahn,

Kwon,

Chung

et al. 2021

Preprint

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A high-quality factor microwave resonator in the presence of a strong magnetic field could have a wide range of applications, such as axion dark matter searches where the two aspects must coexist to enhance the experimental sensitivity. We introduce a polygon-shaped cavity design with bi-axially textured YBa2Cu3O7−x superconducting tapes covering the entire inner wall. Using a 12-sided polygon cavity, we obtain substantially improved quality factors of the TM010 mode at 6.9 GHz at 4 K with respect to a copper cavity and observe no considerable degradation in the presence of magnetic fields up to 8 T. This corresponds to the first demonstration of practical applications of superconducting radio frequency technology for axion and other research areas requiring low loss in a strong magnetic field. We address the importance of the successful demonstration and discuss further improvements.

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Exfoliated YBCO filaments for second-generation superconducting cable

Cited by 27 publications

References 18 publications

Fabrication of 1 m long multi layered superconducting coated conductor with high engineering critical current density

Fabrication of 1 m long multi layered superconducting coated conductor with high engineering critical current density

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

First prototype of a biaxially textured YBa$_{2}$Cu$_{3}$O$_{7-x}$ microwave cavity in a high magnetic field for dark matter axion search

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