Teruo Izumi1, Masateru Yoshizumi1, Junko Matsuda1, Koichi Nakaoka1, Yasunori Sutoh1, Tatsuhisa Nakanishi1, Akinobu Nakai1, Masashi Miura1, Yutaka Yamada2, Tsutomu Koizumi3, Yuji Aoki3, Akimasa Yajima4 and Yuh Shiohara1
1SRL-ISTEC Division of Superconducting Tapes & Wires, Tokyo 135-0062
The recent progress in the development of TFA-MOD for a long coated conductor is reviewed. The TFA-MOD process is expected as a low cost process to realize the power application using coated conductors. On the effort for high Ic values, the drastic improvement of Jc value was realized by the control of the composition in starting material. Although the same composition as a stoichiometric one of YBa2Cu3Oy had been used in the previous development, it was found that the shift to Ba-poor composition could make Jc values higher. The composition of Y:Ba:Cu=1:1.5:3 has a peak Jc value in the relation of Jc and Ba-ratio. Consequently, an extremely high Ic value of 735 A/cm-width (@77 K, self field) was achieved. In the development by the batch system, it had been difficult to obtain high characteristics in the long tape. The problem was addressed by the numerical analysis considering gas flow and reaction in the film. Then, a 200 m tape with End-to-End Ic value of 201 A/cm-width was realized. Based on the above mentioned results, a large facility for 500 m was installed.
YBaCuO, coated conductor, TFA-MOD method, critical current, reel-to-reel production
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