SuNAM has supplied hundreds of kilometers of Coated Conductors(CC) for various applications, most notably the 1st commercial superconducting cable project in Korea. To keep up with upcoming commercial and R&D cable projects, and to implement pinning in a stable manner, we set up a new RCE-DR(Reactive Co-Evaporation – Deposition and Reaction) system for superconducting layer deposition employing a 100 kW electron-gun. Using the new system, with higher power and enhanced beam stability, we co-evaporated artificial pinning center(APC) generating materials such as Hf and Zr. We also tried rare earth(RE) elements other than currently used Gd, and mixtures of REs to get enhanced pinning. We observed an increase of IC in mid-temperature(20~40 K) and mid-field(< 5 T) range, and are in the process of further optimization for higher fields. Improved e-beam stability and beam controllability also let us make more uniform tapes in our conventional formula for electric power applications such as cables and fault current limiters.
We had also developed high field magnets with the center field higher than 18 Tesla, with which a customer generated meaningful scientific data. We also tested various cable designs mainly based on stacked-tape type with a plan to apply them in our magnet manufacturing. In this conference, the recent activities and achievements in SuNAM will be presented.
Keywords: Coated Conductor, RCE-DR, APC