AC losses and induced fields in HTS coil wound using two-ply coated conductors
AC losses and induced fields in HTS coil wound using two-ply coated conductors
复制标题
使用两层涂层导体缠绕的高温超导线圈中的交流损耗和感应场
DOI：
10.1088/1742-6596/1559/1/012130
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Okada T
中科院分区：
文献类型：
--
作者：
Yokoyama H;Zhu B;Kajikawa K;Awaji S;Badel A;Takahashi K;Okada T
对高温超导磁体插入件的交流损耗和屏蔽电流感应场进行了理论计算。HTS插入物由堆叠的扁平线圈组成，其使用双层导体缠绕，其中两个稀土基涂层导体的超导层侧彼此连接而没有电绝缘。本文导出了同时施加一个传输电流和平行于其宽面的外磁场时，双层导体中交流损耗和自洽场的理论公式。考虑到高温超导插入物中的磁场分布和涂层导体中的临界电流密度的磁场依赖性，使用中心场在60分钟内单调增加至25.5 T的理论公式与低温超导外插线圈相结合来估计交流损耗和SCF。据推测，交流损耗估计的高温超导插入缠绕使用两层导体可以通过使用制备的制冷机冷却。在高温超导插入使用两股导体缠绕的SCF的大小变得小于为单带导体先前估计。
AC losses and screening-current-induced fields (SCFs) in a high temperature superconducting (HTS) inserts for high field magnet are evaluated theoretically. The HTS inserts are composed of stacked pancake coils, which are wound using two-ply conductors, where the superconducting-layer sides of two rare-earth-based coated conductors are attached to each other without electrical insulation. The theoretical formulas of AC loss and SCF in the two-ply conductor are derived for the simultaneous applications of a transport current and an external magnetic field parallel to its broad face. By taking into account the magnetic-field profile in the HTS insert and the magnetic-field dependency of critical current density in the coated conductor, the AC losses and SCFs are estimated using the theoretical formulas for monotonical increase in a central field up to 25.5 T in 60 minutes in combination with low temperature superconducting outsert coils. It is guessed that the AC loss estimated for the HTS insert wound using the two-ply conductor could be cooled by using prepared cryocoolers. The magnitude of SCF in the HTS insert wound using the two-ply conductor becomes smaller than that for the single-tape conductor estimated previously.