Development of Bi-2223 HTS tape and its application to coil and current leads |
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| Affiliation: | 1. Department of Chemistry, University College of Science and Technology, University of Calcutta, Kolkata, India;2. Centre for Research in Nanoscience and Nanotechnology, University of Calcutta, Kolkata, India;1. Department of Chemical Engineering, Indian Institute of Technology Hyderabad, Sangareddy 502 285, Telangana, India;2. Department of Chemistry, Indian Institute of Technology Hyderabad, Sangareddy 502 285, Telangana, India;1. Technology Department, CERN, Geneva, Switzerland;2. DEI, Department of Electrical, Electronic and Information Engineering, University of Bologna, Italy;1. Department of Engineering Physics, Faculty of Engineering, Ankara University, 06100 Ankara, Turkey;2. Department of Chemistry, Faculty of Science, Ankara University, 06100 Ankara, Turkey;1. Centro de Investigación y Desarrollo Tecnológico en Electroquímica, Querétaro, 76703, Mexico;2. Unidad Monterrey, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Vía del Conocimiento 201, Parque PIIT, Apodaca, Nuevo León CP 66628, Mexico;3. Facultad de Ingeniería, Universidad Autónoma de Querétaro, Querétaro, 76010, Mexico |
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| Abstract: | We are developing Bi-2223/Ag tapes with a high engineering critical current density by optimizing the powder-in-tube process and are studying its application to coil and current leads. We have fabricated 250 m-long tape and investigated optimized processing conditions to enhance engineering critical current density. More bubbling was found when the tape was heat-treated with a higher heating rate. Different kinds of superconducting joints were fabricated with multi-filamentary Bi-2223/Ag tapes, and 58% of retained Ic was achieved using the insertion of Bi-2223 core between two exposed tapes. Current decay property of the persistent mode HTS coil was investigated. Rapid current decay was observed when the operating current is in a flux-flow range. We could successfully fabricate a low heat leak type HTS current lead with Bi-2223/Ag–Au tapes by employing a stepped geometry. Using this lead, safe operation of 2 kA current transport was confirmed. |
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