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When a commercially available coated conductor with a substrate thickness of 30 µm is applied to the CORC®, the minimum core diameter is approximately 2.4 mm without any degradation in the critical current (Ic). Because the engineering current density of the CORC® is highly dependent on the core diameter, the cable with a smaller core is desirable to achieve compact coil windings for high-field accelerator magnets. In this study, a REBCO stack conductor, made by soldering two coated conductors with their REBCO layers facing each other, was applied to the round cable instead of the commercially available single coated conductor. This REBCO stack conductor allows the REBCO layer to be closer to the neutral axis of the conductor, thereby reducing the strain induced in the REBCO layer by winding the conductor on the core. As a result, the REBCO stack conductor can be wound on a smaller core than the CORC®, allowing for higher current densities. This paper presents the magnetic field dependent Ic of the coated conductor at 4.2 K, the cable Ic and estimated strain of the REBCO layer as a function of the core diameter at 77 K, and the calculated cable current density made with the stack conductor.

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• Creative Commons BY Attribution 4.0 International
  

Keyword: High current cable, CORC®, STAR®, critical current, current density, high magnetic field, accelerator magnet

Date published: 2024-12-20

Publisher: Institute of Electrical and Electronics Engineers (IEEE)

Journal:

• IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY (ISSN: 10518223) vol. 35 issue. 5 4800505

Funding:

• MEXT Development of Key Element Technologies JPMXP1423812204

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5581

First published URL: https://doi.org/10.1109/tasc.2024.3520940

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Updated at: 2025-07-11 16:30:41 +0900

Published on MDR: 2025-07-11 16:17:25 +0900