The Jc Limit of Multifilamentary Ag/Bi-2223 Tapes |
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Authors: | W M Chen S S Jiang and W Chen |
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Affiliation: | (1) Department of Physics and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210093, People's Republic of China;(2) Department of Agricultural and Resource Economics, Oregon State University, Corvallis, Oregon, 97330 |
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Abstract: | To improve on present critical current (J
c) performance, multifilamentary Ag/Bi-2223 tapes with a large range of reduction rates were manufactured. The relative core mass density D was calculated, dependent on the measured geometric dimensions of the tapes. Experimental results, D vs. J
c, D vs. maximum pinning force density F
max
, and D vs. irreversible magnetic field B
irr, are quantitatively formatted. In particular, the magnetic field dependence of J
c is critically dependent on its core density. If the core density increases by 10%, J
c of the tapes in this experiment is enhanced by as much as 100%. Therefore, in the present state of the technological process for manufacturing Ag/Bi-2223 tape, increasing the core density is clearly a significant strategy in improving the electronic and magnetic properties of the tapes and enhancing the capacity for carrying current at high magnetic fields. The limit of the bulk self-field-J
c can be calculated by the relationships of J
c vs. D. The limit is estimated to be on the order of 200 kA/cm2 for multifilamentary Bi-2223 tapes, which was supported by magneto-optical (MO) magnetization measurements results. It is a hard task to approach this limit with the present state of the art in manufacturing Ag/Bi-2223 tape, and it is the time to suggest some new ideals for Bi-2223 tapes to promote large-scale applications. |
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Keywords: | Bi-2223 tape core density J
c B
irr pinning force density |
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