Asia Pacific Academy of Science Pte. Ltd. (APACSCI) specializes in international journal publishing. APACSCI adopts the open access publishing model and provides an important communication bridge for academic groups whose interest fields include engineering, technology, medicine, computer, mathematics, agriculture and forestry, and environment.
Experimental investigation of low resistance joints for high field HTS magnets
Vol 1, Issue 1, 2025
Download PDF
Abstract
High-temperature superconducting (HTS) tapes are now commercially available for various magnet applications. Their higher tensile strength enhances strain tolerance, allowing for the winding of smaller diameter coils. The most crucial component in a double pancake winding of a coil is the fabrication of inter-double pancake joints with minimal electrical resistance. This is due to the structural design of REBCO (RE—rare earth) tape, which consists of very thin layers of materials prone to deterioration when exposed to temperatures exceeding the recommended value, optimal joint overlap length, and the selection of solder materials. In this study, we investigated the effects of tape overlap lengths, solder materials, and soldering temperatures on joint resistance. The lowest joint resistance recorded was 18 nΩ, achieved with an overlap length of 150 mm at 4.2 K in a self-field, as reported in this paper for a 3.5 T REBCO coil winding pack.
Keywords
References
- Prasad U, Raj P, Bano A, et al. Fabrication and Characterization of BSCCO-2223 Tape Compact Coils. IEEE Transactions on Applied Superconductivity. 2022; 32(6): 1-5. doi: 10.1109/tasc.2022.3180307
- Prasad U, BanoA.SrinivasanR.and Magnet system division. Experimental Study of Different Joint Configurations of HTS BSCCO Tape.IPR/RR-1005/2018
- Kim JH, Joo J. A superconducting joint between Bi Pb Sr Ca Cu O multifilamentary tapes. Superconductor Science and Technology. 2002; 15(11): 1600-1605. doi: 10.1088/0953-2048/15/11/320
- Kim JH, Kim KT, Jang SH, et al. Measurement of joint properties of Bi(pb)-Sr-Ca-Cu-O (2223) tapes by field decay technique. IEEE Transactions on Appiled Superconductivity. 2003; 13(2): 2992-2995. doi: 10.1109/tasc.2003.812049
- Kim JH, Joo J, Kim H, et al. Evaluation of Joint Resistance Between Bi-2223/Ag Superconducting Tapes. IEEE Transactions on Applied Superconductivity. 2006; 16(2): 1059-1062. doi: 10.1109/tasc.2005.864271
- Sohn MH, Kim SW, Baik SK, et al. Joint resistances between two parallel high Tc superconducting tapes. IEEE Transactions on Appiled Superconductivity. 2003; 13(2): 1764-1767. doi: 10.1109/tasc.2003.812885
- Sohn MH, Kim S, Sim KD, et al. Manufacture and Thermal Stability of Small HTS Magnet with a Joint. IEEE Transactions on Applied Superconductivity. 2007; 17(2): 2212-2215. doi: 10.1109/tasc.2007.901255
- Kar S, Kumar R, Konduru P, Datta TS. A study on development of joint between pancake magnets made of SS-laminated Bi-2223/Ag HTS tape. Adv. Cryog. Eng.
- Kim HS, Kwon NY, Chang KS, et al. Joint Characteristics of the YBCO Coated Conductor (CC) by Chemical Etching. IEEE Transactions on Applied Superconductivity. 2009; 19(3): 2835-2838. doi: 10.1109/tasc.2009.2018854
- Zhou Y, Huang Z. A novel low-resistance solder-free copper bonding joint using a warm pressure welding method for REBCO coated conductors. Superconductor Science and Technology. 2024; 37(9): 095026. doi: 10.1088/1361-6668/ad6e24
- Huang D, Shang H, Xie B, et al. An efficient approach for superconducting joint of YBCO coated conductors. Superconductor Science and Technology. 2022; 35(7): 075004. doi: 10.1088/1361-6668/ac6bcb
- Pan Y, Wu W, Zhen S, et al. Investigation on Current Distribution and Joint Resistance-Overlap Length Relationship for Non-Superconducting Joints. IEEE Transactions on Applied Superconductivity. 2019; 29(2): 1-5. doi: 10.1109/tasc.2018.2884915
- Weiss JD, van der Laan DC, Radcliff K, et al. Performance of low-loss demountable joints between CORC® cable-in-conduit-conductors at magnetic fields up to 8 T developed for fusion magnets. Superconductor Science and Technology. 2023; 36(8): 085002. doi: 10.1088/1361-6668/acdc59
- Park Y, Lee M, Ann H, et al. A superconducting joint for GdBa2Cu3O7−δ-coated conductors. NPG Asia Materials. 2014; 6(5): e98-e98. doi: 10.1038/am.2014.18
- Tsui Y, Surrey E, Hampshire D. Soldered joints—an essential component of demountable high temperature superconducting fusion magnets. Superconductor Science and Technology. 2016; 29(7): 075005. doi: 10.1088/0953-2048/29/7/075005
- Huang Z, Tan Y, He R, et al. Study on the electrical performances of soldered joints between HTS coated-conductors. Cryogenics. 2022; 122: 103422. doi: 10.1016/j.cryogenics.2022.103422
- Kumar N, Tomar A, Bano A, et al. Development of a Test Set up for HTS Sample Characterization using Solid Nitrogen. Available online: https://drive.google.com/file/d/1s1sQhMyQoVa5vKlqrXjUlYxpHvfz819M/view?usp=sharing. IPR/TR-713/2023 (accessed on 15 February 2025).
Refbacks
- There are currently no refbacks.
Copyright (c) 2025 Author(s)
License URL: https://creativecommons.org/licenses/by/4.0/
This site is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
Prof. Liang Qiao, University of Electronic Science and Technology of China...