日本金属学会誌

J. Japan Inst. Metals, Vol. 71, No. 11 (2007),
pp. 1011-1016

IBAD-PLD Method Coated Conductor with High Critical Current in a Magnetic Field

Yutaka Yamada1, Akira Ibi1, Seiki Miyata1, Hiroyuki Fukushima1, Hirokazu Kobayashi1, Reiji Kuriki1, Takeharu Kato2, Tsukasa Hirayama2, Teruo Izumi3 and Yuh Shiohara3

1SRL-ISTEC Nagoya Coated Conductor Center, Nagoya 456-8587
2Japan Fine Ceramics Center, Nagoya 456-8587
3SRL-ISTEC Division of Superconducting Tapes & Wires, Tokyo 135-0062

Abstract:

A 215.6 m long GdBa2Cu3O7-x (GdBCO) conductor has been successfully fabricated by the multi-plume and multi-turn pulsed laser deposition (MPMT-PLD) method and exhibited high critical current of 220 A at 77 K and 0 T. Furthermore, the GdBCO long conductor showed three times higher critical current of 25 A at 3 T and 77 K than that of YBCO. To demonstrate the high performance of GdBCO conductor, we fabricated a GdBCO coil. The GdBCO coil was successfully energized up to the currents of 74.2 A and the magnetic field of 0.5 T at 77 K and 184.8 A and 1.2 T at 64 K. In a liquid He excitation test (4.2 K), the GdBCO coil transported a large current of 895 A and generated 5.7 T. These large values of magnetic field and transport current are promising for the application. To increase further critical current in a magnetic field, an artificial pinning center was introduced into the coated conductor. Especially, a BaZrO3 doped GdBCO conductor exhibited high critical current more than 40 A at 3 T and 77 K for all magnetic field angles and was considered to be promising for the conductor used in a high magnetic field.


(Received 2007/5/25)

Keywords:

REBaCuO, coated conductor, pulsed laser deposition, ion beam assisted deposition, critical current, reel-to-reel production, artificial pinning center


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