Fabrication of meter-long coated conductor using RABiTS-PVD methods
ABSTRACT The practical application of HTS materials in power devices requires the HTS conductor which is long, powerful (high current carrying), and affordable. Many different methods for making practical coated conductor include multiple ways of obtaining texture templates and a variety of film deposition methods which include both physical and chemical routes. In this work, three film deposition systems (pulsed laser deposition, sputtering, and evaporation) equipped with reel-to-reel metal tape moving apparatus were installed and used to make meter-long coated conductor. Buffer architecture of CeO2/YSZ/Y2O3 was continuously deposited on Ni alloy using sputtering, evaporation, and PLD. YBCO superconducting layer was continuously deposited on buffered metal tape by pulsed laser deposition. End-to-end critical current Ic of 80 A and critical current density Jc of 1.3 MA cm-2 for 600 nm-thick YBCO at 77 K, self-field have been achieved in 1 cm-wide tape over 1 meter length. Longitudinal distribution of the Ic values was between 72 A/cm and 90 A/cm.
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ABSTRACT: Many high temperature superconducting (HTS) tape manufactures make an effort to reduce the transport current loss of HTS tapes. The knowledge of critical current and self-field in an HTS tape is very useful to compute the transport current losses. The spatial distribution and magnitude of self-field are variable due to the neighboring materials. In this paper, the critical currents and the transport current losses of BSCCO and YBCO tapes with paralleled magnetic material (Ni tape) and/or diamagnetic material (BSCCO tape) are experimentally investigated to improve the AC loss properties. The critical currents of HTS tapes with paralleled Ni tape are slightly decreased and the transport current losses are markedly increased. However, the critical currents and transport current losses of HTS tapes with paralleled BSCCO tape have not current carrying are more improved than single HTS tapeIEEE Transactions on Applied Superconductivity 07/2006; DOI:10.1109/TASC.2005.869674 · 1.32 Impact Factor
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ABSTRACT: After the discovery of HTS (High Temperature Superconductor), many types of HTS conductors have been developed. Several BSCCO tapes fabricated by PIT (Powder In Tube) method became commercially available, and the transport current loss characteristics of BSCCO tapes have been investigated by many research groups. The transport current loss characteristics of YBCO tapes, however, are not well studied. This is because measuring transport current requires tape samples over a certain length (15 cm for our own system). Many groups are currently focusing their effort on manufacturing long YBCO tape conductors, and new world records of length and current carrying capability are replacing the old ones in an increasingly fast rate. This paper deals with transport current losses of commercially available BSCCO tapes and YBCO tapes made at Korea Electrotechnology Research Institute (KERI) of Korea. YBCO tapes show relatively high transport current losses. This can be explained by the fact that the YBCO tape does not consist of filaments. Measurement results of the tapes are presented with analyses and discussions.IEEE Transactions on Applied Superconductivity 07/2005; DOI:10.1109/TASC.2005.848258 · 1.32 Impact Factor
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ABSTRACT: TmBa<sub>2</sub>Cu<sub>3</sub>O<sub>7</sub> <sub>-</sub> <sub>x</sub> films which is one of the (Rare earth)Ba<sub>2</sub>Cu<sub>3</sub>O<sub>7</sub> <sub>-</sub> <sub>x</sub> high temperature superconductors with small ionic radius of rare earth element, were deposited on STO (100) single crystal substrates and Y<sub>2</sub>O<sub>3</sub>/YSZ/CeO<sub>2</sub> buffered metal substrates by pulsed laser deposition. The J<sub>c</sub> (77 K) and the value of onset of Tc TmBCO thin film on STO substrate was 4.5 MA/cm<sup>2</sup> and 86 K, respectively. The of J<sub>c</sub> TmBCO coated conductor on metal substrate was 1 MA/cm<sup>2</sup> . In-field property measurement was carried out at temperatures between 10 K and 77 K in magnetic filed up to 6 T in PPMS system. This is the first report, to the best of our knowledge, of TmBCO thin films and coated conductors with TmBCO film as the superconducting layer which have critical current densities at 77 K of 4.5 MA/ cm<sup>2</sup> and 1 MA/cm<sup>2</sup> , respectively. The superconducting properties of TmBCO films and the possibility of using TmBCO film as the superconducting layer of the HTS coated conductor, were investigated.IEEE Transactions on Applied Superconductivity 01/2007; 17(2):3545-3548. DOI:10.1109/TASC.2007.898924 · 1.32 Impact Factor