Low resistance splices for HTS devices and applications

Lalitha, S. L.

doi:10.1016/j.cryogenics.2017.06.003

Low resistance splices for HTS devices and applications

Journal Article · Fri Jun 30 00:00:00 EDT 2017 · Cryogenics

DOI:https://doi.org/10.1016/j.cryogenics.2017.06.003· OSTI ID:1440886

Lalitha, S. L. ^[1]

Brookhaven National Laboratory (BNL), Upton, NY (United States). Superconducting Magnet Division; Michigan State Univ., East Lansing, MI (United States). Magnet Systems Dept. and Facility for Rare Isoptope Beams Lab.

This paper discusses the preparation methodology and performance evaluation of low resistance splices made of the second generation (2G) high-temperature superconductor (HTS). These splices are required in a broad spectrum of HTS devices including a large aperture, high-field solenoid built in the laboratory to demonstrate a superconducting magnetic energy storage (SMES) device. Several pancake coils are assembled in the form of a nested solenoid, and each coil requires a hundred meters or more of 2G (RE)BCO tape. However, commercial availability of this superconductor with a very uniform physical properties is currently limited to shorter piece lengths. This necessitates us having splices to inter-connect the tape pieces within a pancake coil, between adjacent pancake coils, and to attach HTS current leads to the magnet assembly. As a part of the optimization and qualification of splicing process, a systematic study was undertaken to analyze the electrical performance of splices in two different configurations suitable for this magnet assembly: lap joint and spiral joint. The electrical performance is quantified in terms of the resistance of splices estimated from the current-voltage characteristics. Finally, It has been demonstrated that a careful application of this splicing technique can generate lap joints with resistance less than 1 nΩ at 77 K.

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)

Grant/Contract Number:: AC02-98CH10886; SC0012704

OSTI ID:: 1440886

Alternate ID(s):: OSTI ID: 1550401

Report Number(s):: BNL--114434-2017-JAAM

Journal Information:: Cryogenics, Journal Name: Cryogenics Journal Issue: C Vol. 86; ISSN 0011-2275

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

References (7)

Evaluation of Electrical Properties of Lap Joints for BSCCO and YBCO Tapes Baldan, C. A.; Oliveira, U. R.; Shigue, C. Y. IEEE Transactions on Applied Superconductivity, Vol. 19, Issue 3 https://doi.org/10.1109/TASC.2009.2017701	journal	June 2009
Splice Resistance Measurements on 2G YBCO Coated Conductors Rey, C. M.; Duckworth, R. C.; Zhang, Y. IEEE Transactions on Applied Superconductivity, Vol. 19, Issue 3 https://doi.org/10.1109/TASC.2009.2019535	journal	June 2009
Bending Strain Characteristics of the Transport Property in Lap-Jointed Coated Conductor Tapes Shin, Hyung-Seop; Dizon, J. R. C.; Oh, Sang-Soo IEEE Transactions on Applied Superconductivity, Vol. 19, Issue 3, p. 2991-2994 https://doi.org/10.1109/TASC.2009.2019580	journal	June 2009
Low Temperature and Magnetic Field Performance of Spliced Commercial YBCO CC Tediosi, R.; Alessandrini, M.; Beneduce, C. IEEE Transactions on Applied Superconductivity, Vol. 22, Issue 3 https://doi.org/10.1109/TASC.2011.2178579	journal	June 2012
YBCO and Bi2223 Coils for High Field LTS/HTS NMR Magnets: HTS-HTS Joint Resistivity Kim, Youngjae; Bascunan, Juan; Lecrevisse, Thibault IEEE Transactions on Applied Superconductivity, Vol. 23, Issue 3, p. 6800704-6800704 https://doi.org/10.1109/TASC.2013.2243195	journal	June 2013
Test Results of High Performance HTS Pancake Coils at 77 K Lalitha, S. L.; Sampson, W. B.; Gupta, R. C. IEEE Transactions on Applied Superconductivity, Vol. 24, Issue 3 https://doi.org/10.1109/TASC.2013.2287396	journal	June 2014
The Mechanical Design Optimization of a High Field HTS Solenoid Lalitha, Seetha Lakshmi; Gupta, R. C. IEEE Transactions on Applied Superconductivity, Vol. 25, Issue 3 https://doi.org/10.1109/TASC.2014.2367153	journal	June 2015

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Flux Pinning-Induced Stress in a Long Hollow Cylindrical Superconductor Restricted by a Metal Tube Zhao, Yufeng; Xu, Chi Journal of Superconductivity and Novel Magnetism, Vol. 31, Issue 10 https://doi.org/10.1007/s10948-017-4546-y	journal	February 2018
Effect of thermal stress on crack growth in inhomogeneous cylindrical superconductor Zhao, Yufeng; Liu, Hongshan; Xu, Chi Journal of Thermal Stresses, Vol. 42, Issue 2 https://doi.org/10.1080/01495739.2018.1467742	journal	September 2018

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