Friday, 2E-04, -

Development of Long SmBCO/IBAD-MgO Coated Conductor

Hong-Soo Ha

Rock-Kil Ko, Sang-Soo Oh, Chan Park¹, Sang-Im Yoo¹, Do-Jun Youm², Seung-Hyun Moon³

Korea Electrotechnology Research Institute, 70 Bulmosangil, Changwon 641-120, Korea
Tel : +82-55-280-1695, Fax : +82-55-280-1686, e-mail : hsha @keri.re.kr
¹ Dept.of Materials Science & Engineering, Seoul National University, Seoul, Korea
² KAIST, Daejon, Korea
³ SuNam Co Ltd., Anyang, Korea

Thermal co-evaporation method is one of the candidates to develop high quality coated conductors (CCs) with low-cost that has benefits to deposit wide area uniformly and use cheaper thermal evaporation sources and raw materials. Good CCs have been usually made by using the Ion Beam Assisted Deposition (IBAD) template. In this study, we have used IBAD-MgO process to fabricate the biaxially textured template for CCs and co-evaporation method to deposit Sm₁Ba₂Cu₃Oy(SmBCO) superconducting layer on IBAD-MgO template. The batch type co-deposition system was specially designed and was named EDDC (evaporation using drum in dual chamber) that is possible to deposit superconducting layer with optimum composition ratio of materials at temperature over 700°C and several mTorr of oxygen. Recently, EDDC system was modified to improve the deposition rate, reproducibility of composition ratio and deposition conditions of superconducting layer. We have investigated the influence of SmBCO thickness and deposition rate on the critical current density of CCs. Rotation speed and evaporation rates were increased to acquire higher growth rate over 3um/h to make 100m long coated conductor. After deposition of 100m long CCs, critical current was measured using R2R hall probe measurement system and R2R transport Ic measurement system.

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