Ultra-Small Diameter Round REBCO Wire With Robust Mechanical Properties

Kar, Soumen; Luo, Wenbo; Selvamanickam, V.

doi:10.1109/tasc.2017.2669727

Cited by 29 publications

(17 citation statements)

References 9 publications

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“…For helical tapes around a former, the conductor I c degraded less when the REBCO layer was closer to the tape neutral plane through additional Cu lamination [17] or customized conductor architecture [31]. For a conductor layout shown in Fig.…”

Section: Discussionmentioning

confidence: 99%

“…The configuration of a helical tape is used for CORC R [17,26,28,29] and other round cables [30,31]. The base curve for this configuration is a circular helix X = (r cos t, r sin t, p t), (6) where the radius r is the sum of the former radius and half of the tape thickness; t is the parameter in radian and 2πp is the pitch length.…”

Section: A Helically Wound Rebco Tapesmentioning

confidence: 99%

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Strain Distribution in REBCO-Coated Conductors Bent With the Constant-Perimeter Geometry

Wang

Arbelaez

Caspi

et al. 2017

IEEE Trans. Appl. Supercond.

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Abstract-Cable and magnet applications require bending REBa2Cu3O 7−δ (REBCO, RE = Rare Earth) tapes around a former to carry high current or generate specific magnetic fields. With a high aspect ratio, REBCO tapes favor the bending along their broad surfaces (easy way) than their thin edges (hard way). The easy-way bending forms can be effectively determined by the constant-perimeter method that was developed in the 1970s to fabricate accelerator magnets with flat thin conductors. The method, however, does not consider the strain distribution in the REBCO layer that can result from bending. Therefore, the REBCO layer can be over-strained and damaged even if it is bent in an easy way as determined by the constant-perimeter method.To address this issue, we developed a numerical approach to determine the strain in the REBCO layer using the local curvatures of the tape neutral plane. Two orthogonal strain components are determined: the axial component along the tape length and the transverse component along the tape width. These two components can be used to determine the conductor critical current after bending. The approach is demonstrated with four examples relevant for applications: a helical form for cables, forms for canted cos θ dipole and quadrupole magnets, and a form for the coil end design. The approach allows to optimize the design of REBCO cables and magnets based on the constantperimeter geometry and to reduce the strain-induced critical current degradation.

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Section: Discussionmentioning

confidence: 99%

Section: A Helically Wound Rebco Tapesmentioning

confidence: 99%

Strain Distribution in REBCO-Coated Conductors Bent With the Constant-Perimeter Geometry

Wang

Arbelaez

Caspi

et al. 2017

IEEE Trans. Appl. Supercond.

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“…Further optimization of the configuration of 2G HTS tape (mainly reduction of the total tape thickness) is also considered, which could be a straightforward strategy to achieve higher J e without modulating the superconducting layer structure. In this scenario, thinner Hastelloy substrate [16], and single sided copper plating [17], single sided lamination techniques [18] have been proposed. Among them, usage of the Hastelloy substrate with the thickness less than 50 µm has been attracting more attention, due to its high feasibility for the 2G HTS tape made at SST.…”

Section: Introductionmentioning

confidence: 99%

Recent development and mass production of high J _e 2G-HTS tapes by using thin hastelloy substrate at Shanghai Superconductor Technology

Jiang¹,

Zhao

Zhu

et al. 2020

Supercond. Sci. Technol.

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Over the past few years, emerging applications such as high current conductors for magnets in compact fusion systems and ultra-high field insert magnets require higher engineering current density (J e ) of the second generation high temperature superconductor (2G-HTS) tapes. In this paper, the state-of-art of 2G-HTS tapes with 30 µm Hastelloy substrate at Shanghai Superconductor Technology (SST) are presented. RE 1 Ba 2 Cu 3 O 7 (REBCO, RE = rare earth) films with strong artificial pinning centers (APCs) are deposited on 30 µm thick Hastelloy substrate. Compared to those with 50 µm thick substrate, higher average critical current (I c ), better I c homogeneity and better I c linearity with film thickness increase are also achieved at 77 K self-field for tapes with 30 µm substrate, where piece lengths are up to 1 km. For a 4 mm wide tape with a total thickness of 35 µm, I c and non-copper J e values reach 600 A and 450 kA cm −2 at 4.2 K, 10 T (B//c), respectively. Transmission electron microscopy observation reveals formation of mixed landscape defects mainly including high density of splayed nanoroads and stacking faults in the REBCO film thickness direction, which is attributed to the extremely high REBCO growth rate of over 50 nm s −1 . The pinning force density (F p ) at 4.2 K, 12 T (B//c) reaches over 800 GN m −3 , and the lift factors (defined as the ratio of I c at 4.2 K, 10 T to I c at 77 K, self-field) of tapes with large I c range (100 to 500 A cm −1 -w at 77 K, self-field) also show good consistency. The annual production of 10 mm wide tapes with such pinning centers can exceed 200 km for a single set of facility at SST. No significant I c reduction is observed at bending diameter of 3 mm and the proof strength (R p0.2_0 ) is 812 MPa, both measured at liquid nitrogen temperature.

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“…Conductors with a high aspect ratio such as the Roebel cable can minimize the strain in REBCO layers by following the constant-perimeter principle for magnet design and conductor bending [100][101][102][103][104]. From this aspect, round REBCO conductors are more flexible and can work with diverse magnet designs, although to understand the critical current degradation and reduce the strain development is still critical [30,[105][106][107][108][109][110].…”

Section: How To Make High-field Accelerator Magnets Using Multi-tape mentioning

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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Ultra-Small Diameter Round REBCO Wire With Robust Mechanical Properties

Cited by 29 publications

References 9 publications

Strain Distribution in REBCO-Coated Conductors Bent With the Constant-Perimeter Geometry

Strain Distribution in REBCO-Coated Conductors Bent With the Constant-Perimeter Geometry

Recent development and mass production of high J _e 2G-HTS tapes by using thin hastelloy substrate at Shanghai Superconductor Technology

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

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Ultra-Small Diameter Round REBCO Wire With Robust Mechanical Properties

Cited by 29 publications

References 9 publications

Strain Distribution in REBCO-Coated Conductors Bent With the Constant-Perimeter Geometry

Strain Distribution in REBCO-Coated Conductors Bent With the Constant-Perimeter Geometry

Recent development and mass production of high J e 2G-HTS tapes by using thin hastelloy substrate at Shanghai Superconductor Technology

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

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Recent development and mass production of high J _e 2G-HTS tapes by using thin hastelloy substrate at Shanghai Superconductor Technology