Development of a REBa2Cu3O7−δ multi-core superconductor with 'inner split' technology. (3rd March 2016)

• Record Type: Journal Article
• Authors: Jin, Xinzhe; Oguro, Hidetoshi; Oshima, Yugo; Matsuda, Tetsuro; Maeda, Hideaki
• Is Part Of: Superconductor science & technology. Volume 29:Number 4(2016:Apr.)
• Publication Date: 2016-03-03
• Subjects: RE123 -- multi-core -- superconducting wire -- inner split; Superconductivity -- Periodicals; Superconductors -- Periodicals; 537.623
• DOI: 10.1088/0953-2048/29/4/045006
• Languages: English
• ISSNs: 0953-2048

Abstract

Abstract: Recently, advanced research into fine filament technology for tape-shaped superconducting-coated conductors composed of REBa2 Cu3 O7– δ (RE123, RE: rare earth such as Gd or Y, 0 < δ < 1) has been carried out to improve performance in high magnetic fields by reducing the large diamagnetism of the RE123 superconducting layer. The major challenge for high-field NMR/MRI applications is to obtain high tensile stress tolerance above 500 MPa with a high critical current. In this study, a RE123 multi-core superconductor was fabricated via an 'inner split' method using a commercially available RE123 single-core coated conductor, where only the ceramics (RE123 and buffer layers) in wire are electrically separated to multi-filaments without superconducting current flow between the filaments. Experimental results show that wires having 2, 3, 4, or 5 cores have a high critical current (above 95% of the original) and maintain tensile stress tolerance above 650 MPa. The diamagnetism of the five-core wire is reduced ∼85% of the original at 7 T. Thus, the wire was optimized via inner split method for high-field use.