Rapid Production of Buffered Substrates and Long Length Coated Conductor Development Using IBAD, PLD Methods and “Self-Epitaxial” Ceria Buffer

Activities at SRL-Nagoya Coated Conductor Center (NCCC) are presented including rapid production of 100 to 220 m buffered substrate tapes and a 46 m YBCO coated conductor using reel-to-reel equipment of both IBAD and PLD systems. A 220 m long IBAD and a 100 m long CeO/sub 2/ capped substrate have been successfully and stably produced. Furthermore, the PLD-CeO/sub 2/, which we call the "Self-Epitaxial" method, is found to be effective to increase a production rate. The combination of IBAD and PLD-CeO/sub 2/ enhanced the overall buffer processing rate up to 2 m/h. This is much higher than the rate of 0.5 to 1 m/h of the conventional IBAD method. We also recently introduced a new PLD system for YBCO, which utilizes a multi-plume and multi-turn deposition, MPT-PLD method. This system is now successfully operating and then very recently we have achieved the record of I/sub c//spl times/L (critical current times length) of 8335 Am. A 45.8 m long YBCO coated conductor carried the high I/sub c/ of 182 A. The MPT-PLD method is also effective to increase the thickness of YBCO with high J/sub c/. Consequently, I/sub c/ as high as 300 A was also obtained for a short sample test. Therefore, the new system of MPT-PLD is very promising for long YBCO tape fabrication.