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Title: Analysis of Defect Irrelevancy in a Non-Insulated REBCO Pancake Coil Using an Electric Network Model

Journal Article · · IEEE Transactions on Applied Superconductivity
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Duke Univ., Durham, NC (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
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High-temperature superconducting REBCO coated conductor is one of the main candidates for next-generation high field magnets in fusion reactors and particle accelerators owing to their high current-carrying capability. Although these materials can operate at higher temperatures and generate higher magnetic fields than their counterparts with lower critical temperatures, protecting the REBCO magnet against quench is challenging. A variety of candidate technologies that may be able to enable self-protection, including no-insulation technology and insulative coatings with temperature-dependent resistance, are in development. Here, in order to understand current sharing and thermal processes during a quench, we model a REBCO pancake coil as an electrical circuit, considering power generation and heat transfer along conductor turns, and study the current distribution around a local defect with lower critical current. The magnetic field and coil terminal voltage predicted by the simulation was compared to published experimental results. Our results provide useful insights into how current sharing occurs around defects.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Science (SC), Workforce Development for Teachers and Scientists (WDTS); USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1904175
Journal Information:
IEEE Transactions on Applied Superconductivity, Journal Name: IEEE Transactions on Applied Superconductivity Journal Issue: 6 Vol. 32; ISSN 1051-8223
Publisher:
IEEECopyright Statement
Country of Publication:
United States
Language:
English

References (19)

Electromagnetic, Thermal, and Mechanical Quench Simulation of NI REBCO Pancake Coils for High Magnetic Field Generation journal August 2019
An equivalent circuit grid model for no-insulation HTS pancake coils journal March 2015
Charging Behavior in No-Insulation REBCO Pancake Coils journal June 2015
Superconducting Magnets Above 20 Tesla journal August 2002
‘Defect-irrelevant-winding’ no-insulation (RE)Ba2Cu3O7 − x pancake coil in conduction-cooling operation journal June 2021
High-Tc superconducting materials for electric power applications journal November 2001
Fluorescent thermal imaging of a non-insulated pancake coil wound from high temperature superconductor tape journal August 2019
Vanadium oxide coatings to self-regulate current sharing in high-temperature superconducting cables and magnets journal August 2020
Quench and Stability Modelling of a Metal-Insulation Multi-Double-Pancake High-Temperature-Superconducting Coil journal August 2021
Quench analysis of pancake wound REBCO coils with low resistance between turns journal December 2015
‘Defect-irrelevant’ behavior of a no-insulation pancake coil wound with REBCO tapes containing multiple defects journal September 2016
An Electric-Circuit Model on the Inter-Tape Contact Resistance and Current Sharing for REBCO Cable and Magnet Applications journal June 2020
45.5-tesla direct-current magnetic field generated with a high-temperature superconducting magnet journal June 2019
Mechanism of notable difference in the field delay times of no-insulation layer-wound and pancake-wound REBCO coils journal August 2016
HTS Pancake Coils Without Turn-to-Turn Insulation journal June 2011
Turn-to-turn contact characteristics for an equivalent circuit model of no-insulation ReBCO pancake coil journal January 2013
CLIQ. A new quench protection technology for superconducting magnets dissertation June 2015
Understanding quench in no-insulation (NI) REBCO magnets through experiments and simulations journal January 2020
Dipole Magnets Above 20 Tesla: Research Needs for a Path via High-Temperature Superconducting REBCO Conductors journal November 2019

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circuit simulation
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