Systematic Study of the Contact Resistance Between REBCO Tapes: Pressure Dependence in the Case of No-Insulation, Metal Co-Winding and Metal-Insulation
| Autor: | Alexandre Fete, Marco Bonura, Carmine Senatore, Christian Barth, Jose Ferradas Troitino, A. Joudrier |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Contact resistance ddc:500.2 Superconducting magnet Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Conductor Electromagnetic coil Etching Magnet 0103 physical sciences Electrical and Electronic Engineering Composite material 010306 general physics Current density Electrical conductor |
| Zdroj: | IEEE Transactions on Applied Superconductivity, Vol. 29, No 5 (2019) |
| ISSN: | 2378-7074 1051-8223 |
| Popis: | No-insulation and partial-insulation are novel approaches for compact, high field rare-earth-Ba2Cu3O7-x-coated conductor magnets. They maximize the current density and overcome some of the coated conductors' intrinsic challenges such as the low normal zone propagation velocity and the resulting difficulties to quench REBCO magnets safely. However, this comes at a reduction of the field quality and an increase of the charging time. The performance of this type of coils is mainly determined by the contact resistance between the different layers of the winding. In the case of partially-insulated coils, the contact resistance can be adjusted by a tailored choice of the material used for the metal co-winding or for the metallic coating of the REBCO tape. We present here a systematic study of the impact of pressure on the contact resistance in the cases of direct contact (no-insulation) as well as metal co-winding and metal coating (partial-insulation). Different “insulation” metals as well as various “insulation” to REBCO tape ratios are tested at 77 K in self-field varying the contact pressure in the range of 10–200 MPa. The goal is to provide coil manufacturers with the means of achieving a controlled contact resistance to optimize the coil performance. |
| Databáze: | OpenAIRE |
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