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Seung-Hyun Moon1

1, SuNAM Co Ltd, Gyeonggido, , Korea (the Republic of)

SuNAM has been producing long-length coated conductors based on a proprietary process which consists of electron beam co-evaporation of constituent metals and subsequent conversion of precursor film to superconducting phase by carefully controlling temperature and oxygen pressure. After securing stable manufacturing routine for upto 1 km-long wires, with about 10 percent uniformity in critical current enabled by various quality control measures, we tried to further increase critical current above 1,000 A/cm-width. This goal should be achieved by increasing thickness of superconducting layer while retaining critical current density, or even enhancing it. We varied co-evaporation process to enhance composition uniformity, and also modify temperature and pressure profile in heat treatment furnace to better utilize conversion dynamics of GdBa2Cu3O7-x phase formation, and the results will be presented.
With these wire, we made 400 mH compact reactor with cryogen free operation. The reactor’s operating current is over 1,500 A at temperature is around 10 K. Detailed design, construction, and operating results will be discussed. And first all HTS CC base commercial 18 T magnet result will be introduced. A 70 mm cold bore high temperature superconducting (HTS) magnet was developed for axion detector system of Center for Axion and Precision Physics (CAPP) research center in Institute for Basic Science (IBS) in the Republic of Korea. A key parameter for axion detector magnet is to generate high and longitudinally uniform magnetic field in RF cavity. Magnetic field strength on -100 mm < z < 100 mm in coil bore space should be larger than 90 % of it at magnet center.
Finally we’ll summarize a commercialization & industrialization efforts in Korea, and suggest a key issues to open the true market.

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