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Title: An experimental study to investigate magnetic field and winding force-dependent contact resistance of NI REBCO coil

Journal Article · · Superconductor Science and Technology

Abstract This paper reports the magnetic field and winding force-dependent contact resistance, also known as characteristic resistance, of no-insulation (NI) REBCO coil. Three NI coils were wound with different winding forces ( < 1 kgf, 3 kgf, and 5 kgf) using the same REBCO-coated conductor, and they were tested at 4.2 K in a background field of 0, 5, 10, and 14 T. The contact resistance of each coil is measured at each field. As a result of the measurements, we draw two conclusions. First, a quadratic function for magnetic field intensity reasonably reproduces the measurement results of each NI test coil’s magnetic field-dependent contact resistance, where the practical fit function’s coefficients are determined depending on the winding force. Second, the contact resistance of each coil is partially inconsistent with the magnetoresistance of the electroplated material, i.e. copper, of the REBCO-coated conductor. This paper will present the measurement results in detail, discuss them with Kohler’s rule, and formulate the contact resistance using winding force and magnetic field terms.

Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Grant/Contract Number:
SC0022011
OSTI ID:
2281058
Journal Information:
Superconductor Science and Technology, Journal Name: Superconductor Science and Technology Journal Issue: 2 Vol. 37; ISSN 0953-2048
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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