Development of Multi-plume and Multi-turn (MPT) PLD for YBCO Coated Conductor
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Development of Multi-plume and Multi-turn (MPT) PLD for YBCO Coated Conductor Tomonori Watanabe 1, Reiji Kuriki 1, Takemi Muroga 1, Seiki Miyata 1, Akira Ibi 1, Yutaka Yamada 1, Yuh Shiohara 2, Takeharu Kato 3 and Tsukasa Hirayama 3 1 ISTEC-SRL Nagoya Coated Conductor Center, 2-4-1, Mutsuno, Atsuta-ku, Nagoya, 456-8587, Japan 2 ISTEC-SRL, 10-13, Shinonome 1-chome, Koto-ku, Tokyo, 135-0062, Japan 3 Japan Fine Ceramics Center, 2-4-1, Mutsuno, Atsuta-ku, Nagoya, 456-8587, Japan ABSTRACT Our multi-plume and multi-turn (MPT) pulsed-laser deposition (PLD) has been improved to accelerate reliable and fast deposition technique of high Ic (critical current) YBCO (YBa2Cu3O7-x) layer for a long coated conductor fabrication, for we increased the number of multi-turn, from three to four, in our multi-plume and multi-turn (MPT) PLD system. This increase of the number of depositing turns achieved high deposition rate corresponded to 75 mm3/h (=1 µm-thick × 10 mm-wide × 7.5 m/h, throughout all 4 turns) for YBCO layer. This four turn (4t)-MPT-PLD also indicated a capability to combine high deposition rate and high Ic. We attained the highest Ic’s of 321 A at the tape speed of 3 m/h and 340 A at tape speed of 2 m/h by 4t-MPT-PLD in 10 mm-wide and 10 cm-long samples. Based on these results, we successfully deposited a 100 m long YBCO layer by 4t-MPT-PLD. This coated conductor had high Ic as high as 159 A, therefore, the multiplication of Ic and length exhibited high value of 15.9 kA·m. INTRODUCTION Enlargement of deposition area is one of the problems to be solved to achieve high deposition rate of YBa2Cu3O7-x (YBCO) layer by pulsed laser deposition (PLD) for long coated conductor fabrication. We introduced a reel-to-reel PLD system, in which the optical system was designed so that the laser beam scanned YBCO targets during deposition and produced plural and discrete plumes (multi-plume) to enlarge the deposition area along the tape substrate transferring direction. Reel-to-reel tape transferring system was designed so that the substrate was transferred through multi-turn loops, and turned around a substrate heater for 3 times (multi-turn), to enlarge the deposition area across the substrate transferring direction. Using this multi-plume and multi-turn (MPT) PLD system, we have investigated a high rate deposition of YBCO with high critical current (Ic) on the “self-epitaxial” PLD-CeO2 cap layer, which indicates drastic improvement of the in-plane grain alignment, on the ion beam assisted deposition (IBAD)-Gd2Zr2O7 (GZO) buffered Hastelloy tape [1, 2]. Then, a 45.8 m long YBCO layer was succeeded in deposition and its end-to-end Ic reached 182 A, thus that the multiplication of Ic and length reached high value of 8.34 kA·m [2]. Subsequently, we have increased the number of multi-turn three to four for an efficient deposition. This paper reports our recent progress in MPT-PLD for further scale-up of YBCO coated conductor.
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EXPERIMENTAL DETAILS Substrates used in this study were prepared by the combination of IBAD with P
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