Development of REBCO Coated Conductors on
Low Magnetic Textured Metal Substrates

Hajime Ota, Masaya Konishi, Yuki Shingai,
Tatsuoki Nagaishi, Takahiro Taneda, Kazuya Ohmatsu

Abstract — In the R&D of coated conductors, we had been using textured metal substrates with magnetism. For AC applications such as power cables, motors, superconducting magnetic energy storages (SMESs) and others, we had to reduce the magnetism of substrates. To reduce the magnetism of the substrate, we developed low magnetic clad-type substrates. Improvement of the surface morphology of the clad-type substrate led to the increase of Ic. We obtained the maximum Ic of 380 A/cm with GdBa₂Cu₃O_y superconducting film of 2 μm thickness. We also improved the production rate of the buffer layers by increasing the line speed and the tape width. As a result, the average speed of 20 m/h was achieved without any degradation of substrate properties. The expansion of tape width from 1 cm to 3 cm was achieved keeping uniform across-the-width characteristics of buffer layers.

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