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Title: Low resistance splices for HTS devices and applications

Abstract

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 1more » nΩ at 77 K.« less

Authors:
 [1]
  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.
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1440886
Alternate Identifier(s):
OSTI ID: 1550401
Report Number(s):
BNL-114434-2017-JAAM
Journal ID: ISSN 0011-2275
Grant/Contract Number:  
SC0012704; AC02-98CH10886
Resource Type:
Accepted Manuscript
Journal Name:
Cryogenics
Additional Journal Information:
Journal Volume: 86; Journal Issue: C; Journal ID: ISSN 0011-2275
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; 42 ENGINEERING

Citation Formats

Lalitha, S. L. Low resistance splices for HTS devices and applications. United States: N. p., 2017. Web. doi:10.1016/j.cryogenics.2017.06.003.
Lalitha, S. L. Low resistance splices for HTS devices and applications. United States. doi:10.1016/j.cryogenics.2017.06.003.
Lalitha, S. L. Fri . "Low resistance splices for HTS devices and applications". United States. doi:10.1016/j.cryogenics.2017.06.003. https://www.osti.gov/servlets/purl/1440886.
@article{osti_1440886,
title = {Low resistance splices for HTS devices and applications},
author = {Lalitha, S. L.},
abstractNote = {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.},
doi = {10.1016/j.cryogenics.2017.06.003},
journal = {Cryogenics},
number = C,
volume = 86,
place = {United States},
year = {2017},
month = {6}
}

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