Fusheng reagent-Japan successfully developed the next generation of ultra-thin high-temperature superconducting cable

Fusheng Reagent-Japan successfully developed the next generation of ultra-thin high-temperature superconducting cables. The joint R & D team composed of Japan Institute of Physics and Chemistry and Chiba University successfully developed the next-generation ultra-thin high-temperature superconducting cables whose insulation is one-tenth the thickness. At present, high-temperature superconducting cables are usually in the form of thin strips with a width of 4 mm to 5 mm and a thickness of 100 μm to 150 μm. The thickness of the insulating part and the thickness of the conductive wire are basically the same, each being about 50 microns. The thicker insulating layer has a certain influence on the current density, and also makes it difficult to further reduce the size of the superconducting coil. The joint team used the same polyimide electrodeposition method as metal plating to form an extremely thin polyimide insulator film on the surface of the conductive wire. The thickness of the insulator is only 4 microns, which is one-tenth of the thickness of the insulating portion of high-temperature superconducting cables. After testing, the cross-sectional insulation ratio is below 10%, which is more than 80% less than that of existing high-temperature superconducting cables; the current density of the superconducting coils made is more than doubled, and the volume can be reduced by about 4/5. The manufacturing process is also more simplified than the current polymer insulation tape wrapping method. Small superconducting coils and high-temperature superconducting cables with a length of several kilometers can be produced as required. This method makes it possible to miniaturize and low-cost manufacture of devices such as nuclear magnetic resonance (NMR) and magnetic resonance imaging (MRI). The research results will be published in the electronic version of Physica C magazine.

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