Fabrication and Electromagnetic Characterization of Ultrasmall Diameter REBCO Wires

Luo, Wenbo; Kar, Soumen; Xu, Aihua; Li, Xiaofen; Yahia, Anis Ben; Selvamanickam, V.

doi:10.1109/tasc.2016.2641242

Cited by 25 publications

(20 citation statements)

References 16 publications

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“…However, from the perspective for magnet applications, multifilamentary round wire is strongly preferred for easy handling, isotropic performance and reduced ac loss. Several cabling techniques have been developed for REBCO coated conductors to produce suitable conductors for magnet builders with varying levels of success 41, 42 . The cabling unavoidably compromises the J e advantage of REBCO coated conductors because of the need for mechanical support.…”

Section: Discussionmentioning

confidence: 99%

J e (4.2 K, 31.2 T) beyond 1 kA/mm2 of a ~3.2 μm thick, 20 mol% Zr-added MOCVD REBCO coated conductor

Zhang

Gharahcheshmeh

et al. 2017

Sci Rep

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A main challenge that significantly impedes REBa2Cu3Ox (RE = rare earth) coated conductor applications is the low engineering critical current density J e because of the low superconductor fill factor in a complicated layered structure that is crucial for REBa2Cu3Ox to carry supercurrent. Recently, we have successfully achieved engineering critical current density beyond 2.0 kA/mm2 at 4.2 K and 16 T, by growing thick REBa2Cu3Ox layer, from ∼1.0 μm up to ∼3.2 μm, as well as controlling the pinning microstructure. Such high engineering critical current density, the highest value ever observed so far, establishes the essential role of REBa2Cu3Ox coated conductors for very high field magnet applications. We attribute such excellent performance to the dense c-axis self-assembled BaZrO3 nanorods, the elimination of large misoriented grains, and the suppression of big second phase particles in this ~3.2 μm thick REBa2Cu3Ox film.

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Section: Discussionmentioning

confidence: 99%

J e (4.2 K, 31.2 T) beyond 1 kA/mm2 of a ~3.2 μm thick, 20 mol% Zr-added MOCVD REBCO coated conductor

Zhang

Gharahcheshmeh

et al. 2017

Sci Rep

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“…Such a conductor layout, see figure 2 left, has been christened CORC (Conductor On Round Core) and has been realized in several short sample prototype with indus trial cabling tools, see [43] for a review. A further reduction of the tape thickness, down to 65 µm including copper coating, allows assembling miniature CORC with only 1.6 mm diam eter [44]. A single CORC assembly with a few tens of tapes, is not adequate to carry very high current in field.…”

Section: High Current Hts Cablesmentioning

confidence: 99%

High temperature superconductors for fusion magnets

Fietz²,

et al. 2018

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The commercially available high temperature superconductors (HTS) tapes and wires (BSSCO and REBCO) are introduced and the past and present projects to build fusion devices using HTS based magnets are reviewed. The main design options for high current, high field conductors are presented with the related R&D and the open issues. Depending on the material, the cable layout and the application specific needs, the challenges for HTS magnet technology are different, ranging from the anisotropic properties of the REBCO tapes, to the large volume heat treatment under high pressure for Bi-2212, to the ability to withstand the large transverse loads, to the optimization of the electrical connections for segmented coil assembly, to the ambitious target of fully demountable TF coils for tokamaks. For the generation of magnetic fields larger than 18–20 T, the HTS represents the enabling technology. The use of the expensive HTS can be better justified for applications, which are out of range for conventional, low temperature superconductors (LTS). Eventually, a roadmap for future R&D is sketched focusing on medium term technology milestones, e.g. addressing the issue of quench protection in HTS large magnets, the industrial manufacture of robust high current HTS cables and the engineering design/demonstration of demountable winding packs.

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“…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%

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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Fabrication and Electromagnetic Characterization of Ultrasmall Diameter REBCO Wires

Cited by 25 publications

References 16 publications

J e (4.2 K, 31.2 T) beyond 1 kA/mm2 of a ~3.2 μm thick, 20 mol% Zr-added MOCVD REBCO coated conductor

J e (4.2 K, 31.2 T) beyond 1 kA/mm2 of a ~3.2 μm thick, 20 mol% Zr-added MOCVD REBCO coated conductor

High temperature superconductors for fusion magnets

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

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