AC loss reduction of YBCO coated conductors by multifilamentary structure
AC loss reduction of YBCO coated conductors by multifilamentary structure
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DOI：
10.1088/0953-2048/17/12/018
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发表时间：
2004-12
影响因子：
3.6
通讯作者：
N. Amemiya;Satoshi Kasai;K. Yoda;Zhenan Jiang;G. Levin;P. Barnes;C. Oberly
中科院分区：
文献类型：
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作者：
N. Amemiya;Satoshi Kasai;K. Yoda;Zhenan Jiang;G. Levin;P. Barnes;C. Oberly
YBCO涂层导体的大横截面长径比导致在交流横向磁场中产生较大的磁化损耗。本文对多芯YBCO涂层导体的磁化损耗进行了实验研究。制备了长度为100 mm的条纹状多芯YBCO涂层导体，其中导体和单丝的宽度分别为10 mm和0.4 mm。样品中的条纹是通过激光消融完成的。在垂直于该导体的交流横向磁场中，在不同频率下测量了该条纹导体和参考非条纹导体的磁化损耗。在f=11.3 Hz，H/Hcc=8.8时，100 mm条纹导体的磁化损耗小于非条纹导体测量损耗的9%(Hc=IC/πWC；IC：临界电流，WC：导体宽度)。即使耦合损耗分量增加了条纹导体中的磁化损耗，但即使在171.0赫兹，条纹对交流损耗的降低仍然是明显的。在80K时，用四探针法测量得到的线束间的横向电阻为38µΩ，测量距离为1m。即使在171.0赫兹，用这一横向电阻估算的耦合长度也比样品长度长得多，这表明条纹导体中的线材还远未达到“完全耦合”或“饱和”。
The large cross-sectional aspect ratio of YBCO coated conductors leads to a large magnetization loss in an AC transverse magnetic field. In this work, the magnetization loss of a multifilamentary YBCO coated conductor was studied experimentally. A 100 mm length of striated multifilamentary YBCO coated conductor was prepared where the conductor and filaments were 10 mm wide and 0.4 mm wide, respectively. Striations in the sample were accomplished by laser ablation. The magnetization loss of this striated conductor as well as a reference non-striated conductor was measured in AC transverse magnetic fields normal to the conductor at various frequencies. The measured magnetization loss of the 100 mm striated conductor was less than 9% of the measured loss of the non-striated conductor at f = 11.3 Hz and H/Hcc = 8.8 (Hcc = Ic/πwc; Ic: critical current, wc: conductor width). Even though the coupling loss component increases the magnetization loss in the striated conductor, the AC loss reduction by striation is still apparent even at 171.0 Hz. The transverse resistance between filaments estimated by a four-probe measurement was 38 µΩ for 1 m at 80 K. The coupling length estimated using this transverse resistance is much longer than the sample length even at 171.0 Hz, suggesting that the filaments in the striated conductor are far from 'completely coupled' or 'saturated'.