The influence of tape arrangements on the critical current of Bi-2223 superconducting current leads

被引:3
|
作者
Qu, T.-M. [1 ]
Gu, C.
Li, X.-F.
Zhao, L.
Li, P.
Zhang, H.-J.
Han, Z.
机构
[1] Tsing Hua Univ, Dept Phys, Appl Superconduct Res Ctr, Beijing 100084, Peoples R China
[2] Innova Superconductor Technol Co Ltd, Beijing, Peoples R China
关键词
arrangement; Bi-2223; critical current; current lead; self field;
D O I
10.1109/TASC.2007.899062
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
The current lead is an important application of high temperature superconductors. In this work, superconducting current leads are assembled by using Bi-2223 tapes with J(c) = 32000 A/cm(2) at 77 K under self-field. The influence of self field on the critical current (I-c) is studied by changing the distance (d) between neighboring tapes. With our in-situ d changing device, I-c values of current leads with 2 and 3 tapes are measured as a function of d (0.5-15 mm). It is found that the total I-c decreases greatly if d < 1.0 mm due to the influence of self-field. An analysis method concerning the field dependent property and self-field distribution of the current lead is suggested and compared with the experimental data. Finally 6-tape current leads are prepared. Copper layers are added as protection circuits, which are put between neighboring tapes. The total I-c is about 0.681 of the sum of I-c of each individual tape when d = 0.26 mm. This ratio increases to 0.835 if 1 mm thick copper layers are put between two adjacent tapes (d = 1.26 mm). It agrees with our calculation quite well. This knowledge helps us to design tape arrangements in current leads and other HTS devices using large current.
引用
收藏
页码:2232 / 2235
页数:4
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