Power dissipation in composite Ag/Bi-2223 tapes with twisted and untwisted filaments
Power dissipation in composite Ag/Bi-2223 tapes with twisted and untwisted filaments
复制标题
具有绞合和非绞合细丝的复合 Ag/Bi-2223 带的功耗
DOI：
10.1109/77.919633
复制
发表时间：
2001
影响因子：
1.8
通讯作者：
N. Ayai
中科院分区：
文献类型：
--
作者：
M. Ciszek;O. Tsukamoto;J. Ogawa;N. Amemiya;K. Hayashi;M. Ueyama;N. Ayai
使用交流磁化和传输损耗测量技术测量一组多丝 Bi2223 银护套复合带（具有 61 根细丝）的功耗。为了减少丝间桥接和电磁耦合，显着增加了丝之间的空间。本研究中使用的胶带样品具有扭曲（扭曲节距 15 毫米）和非扭曲细丝。通过标准四点技术测量，临界电流约为 55 安培，对应于大约 9 kA cm/sup -2/ 的临界电流密度。交流传输电流损耗通过标准四点锁定方法测量；在40-160Hz的传输电流频率范围内。磁化损耗测量是在正弦变化的外部磁场中进行的，频率范围为 11 至 155 Hz。外部磁场的方向平行于磁带平面。将所得结果与临界状态模型的理论预测进行比较。
Power dissipation in a set of multifilamentary Bi2223 silver sheathed composite tapes (with 61 filaments) was measured using AC magnetization and transport loss measurement techniques. In order to decrease the interfilamentary bridging and thus electromagnetic coupling, the space between filaments was considerably increased. The tape samples used in this study were with twisted (twist pitch 15 mm) and untwisted filaments. Critical currents were of the order of 55 Amps, as measured by a standard four-point technique, and corresponds to a critical current density of approximately 9 kA cm/sup -2/. The AC transport current losses were measured by a standard four-point lock-in method; in the range of-the transport current frequency of 40-160 Hz. The magnetization loss measurements were performed in a sinusoidally varying external magnetic field, at the frequency range of 11 to 155 Hz. The external magnetic field was oriented parallel to the plane of a tape. The obtained results are compared with theoretical predictions of the critical state model.