Friday, 2C-10, 1:45-1:55

Strategy Toward Low Cost Coated Conductor in IBAD-MgO and PLD Method

Yutaka Yamada

Masateru Yoshizumi, Seiki Miyata, Hiroyuki Fukushima, Akira Ibi, Teruo Izumi and Yuh Shiohara

ISTEC-SRL; Shinonome 1-10-13, Koto-ku, Tokyo, Japan, 135-0062

Strategy toward low cost coated conductor will be presented from IBAD/ PLD experiments which we have done in SRL and with Fujikura.

Up to now, we have succeeded in obtaining 41m long IBAD-MgO and PLD-GdBCO coated conductor with a 4 layered buffer structure. IBAD-MgO was fabricated at the rate of 24m/h. The I_c values recoded 500 to 600 A/cm at 77 K and 0T. The highest I_c was 608 A/cm with the J_c value of 2.43 MA/cm².

Based on this results and the conventional IBAD-GZO results, we have compared the cost effective parameters. In the IBAD-GZO, when using I_c of 300A and 5m/h, we can reach the cost value of 12 Yen /Am ($120/kAm). On the contray, in the new IBAD-MgO/PLD method, we obatined a perspective for a lower cost. This can be done by the fast production rate of IBAD-MgO and the layer number reduction to 4 layers, consisting of Gd₂Zr₂O₇ (GZO) / IBAD-MgO/ LaMnO₃/ CeO₂. For the cost target applied to many commercial superconducting devices, we have to icrease the I_c to 500A/cm and the production speed to 15m/h for superconductor layer, and to 120m/h for IBAD-MgO and to 20- 80m/h for buffer layer From these cost calculation, I will discuss the effect of processing parameters such as throughput, yield, I_c and J_c on the cost and the strategy for the cost reduction considering the impact factor and the milestones for R&D.

This work was supported by New Energy and Industrial Technology Development Organization (NEDO) as the Project for Development of Materials & Power Application of Coated Conductors, M-PACC.

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