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The intra-layer no-insulation (LNI) method achieves self-protection characteristics against quenching in a layer-wound REBCO coil, owing to a current bypass function associated with the copper sheet inserted in each layer. The self-protection is strongly influenced by the electrical contact resistivity ( &#x03C1;  ct ) of the interface between conductors and copper sheets. In particular, a coil requires a high  &#x03C1;  ct  value, typically of the 100 m&#x03A9;cm 2 -class. However, the  &#x03C1;  ct  value of a coil substantially changes due to external disturbances such as thermal cycles and electromagnetic forces. Therefore, it is vital to develop a technology to form an interface that provides a desired  &#x03C1;  ct  value and that is stable against external disturbances. In the present work, we developed a basic method to form a resistance-controlled (RC) interface with a layer thickness as thin as &#x223C;30 &#x03BC;m, using epoxy resin mixed with conductive and insulating fillers, which respectively act as current bypassing paths and spacers. A certain value of the mixing ratio of the conductive fillers provides a target  &#x03C1;  ct  value from a wide range from 1 m&#x03A9;cm 2  to 1,000 m&#x03A9;cm 2 . An RC interface-implemented LNI-REBCO coil exhibits a stable  &#x03C1;  ct  value under thermal cycles and self-protection against an overcurrent quench in liquid nitrogen.

Development of an Intra-Layer No-Insulation (LNI) REBCO Coil Implemented With a Resistance-Controlled (RC) Interface