Experimental determination of two-dimensional critical current density distribution in YBCO coated conductors
Experimental determination of two-dimensional critical current density distribution in YBCO coated conductors
复制标题
YBCO涂层导体二维临界电流密度分布的实验测定
DOI：
10.1088/0953-2048/14/8/317
复制
发表时间：
2001
影响因子：
3.6
通讯作者：
K. Takeda
中科院分区：
文献类型：
--
作者：
N. Amemiya;Yoshichika Shinkai;Y. Iijima;Kazuomi Kakimoto ad;K. Takeda
从其对交流损耗特性的影响以及材料科学和工艺工程的角度来看，YBCO 涂层导体中的临界电流密度 (Jc) 分布引起了人们的兴趣。采用 IBAD（离子束辅助沉积）和 PLD（脉冲激光沉积）方法制备的 YBCO 涂层导体中的二维 Jc 分布可以通过磁刀法测定，空间分辨率分别为横向 0.2 mm 和纵向 10 mm。在最新的 80A 级 YBCO 涂层导体中，Jc 在中心部分相对均匀，达到 \mbox{7$×$109 A m-2, }，而在早期制造且临界电流较小的带的中心部分，Jc 在空间上波动。在带边缘附近，Jc 高于或低于中心部分，并且实验确定的 Jc 分布很不均匀。这表明用于 AC 损耗估计的统一 Jc 的假设并不总是合理的，并且可能导致估计的 AC 损耗出现较大误差。
The critical current density (Jc) distribution in YBCO coated conductors is attracting interest from the viewpoint of its influence on their AC loss characteristics as well as from material science and process engineering. A two-dimensional Jc distribution in a YBCO coated conductor made by the IBAD (ion-beam assisted deposition) and the PLD (pulse-laser deposition) method can be determined by the magnetic-knife method with spatial resolutions of 0.2 mm lateral and 10 mm longitudinal directions, respectively. In an up-to-date 80A-class YBCO coated conductor, the Jc is relatively uniform in the central part and reaches \mbox{7$×$109 A m-2, } while the Jc fluctuates spatially in the central part of a tape fabricated earlier and with less critical current. Near the edges of the tapes, the Jc is higher or lower than in the central part and the experimentally determined Jc distributions are far from uniform. This suggests that a presumption of a uniform Jc for AC loss estimations is not always reasonable and can lead to a large error in the estimated AC losses.