Investigations in the tape-to-tape contact resistance and contact composition in superconducting CORC<sup>®</sup> wires
نویسندگان
چکیده
Abstract Conductor on Round Core (CORC ® ) wires and cables, constructed from multiple layers of helically wound REBa 2 Cu 3 O 7− δ tapes, are a promising cable technology for high field magnet applications. An important feature high-temperature superconductor cables is the ability to share current between conductors, allowing bypass drops in I c minimizing risk hot spot formation, which could lead potential burnout superconductor. In contrast stacked-tape have continuous contact CORC transfer points occur at discrete tape crossovers. The tape-to-tape resistance, R , plays critical role sharing capabilities distribution cables. For work reported here, special were manufactured using different winding parameters investigate variations . Variations comprised inclusion lubricant, lubricant conductivity, pre-tinning, heating briefly melt solder. Cables first tested as straight lengths, followed by bending 10 cm diameter. values ranged 1 over 1000 μ Ω depending cabling parameters, with highest being found made present ‘standard’ process. Bending diameter decreased factor 2–5. Tinning PbSn three orders magnitude compared standard wires, heat treating tinned conductor resulted only small further decrease Based measured an electric V −1 resulting length can range few millimeters tens centimeters. Examination contacts laser confocal microscope showed plastic deformation copper edges overlap area, apparently caused thicker plating digging into neighboring layers. These images reveal that fraction total surface may actually be touching when there nothing compensate height differential. Images coated tapes indicated application solder produces much more uniform higher area. Furthermore, imaging cross-sections confirmed non-tinned many regions where not contact, while shows significantly tapes. techniques morphology significant parameter determining
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ژورنال
عنوان ژورنال: Superconductor Science and Technology
سال: 2022
ISSN: ['1361-6668', '0953-2048']
DOI: https://doi.org/10.1088/1361-6668/ac662f