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建造中的国际热核试验堆以及国内准备建设的聚变工程实验堆上的管内电缆导体(cable-in-conduit conductor,CICC),将运行在快速励磁的大电流复杂磁场中,这使得中心螺线管线圈(central solenoid,CS)上的CICC导体会受到约12 T磁场的冲击。因此,现有的CICC已采用铌三锡(Nb3Sn)导体,Nb3Sn导体应变敏感性不仅导致电缆临界性能的退化,而且导体中各级绞缆扭距序列对耦合损耗影响很大。为此,对目前ITER项目建议的CS磁体上多种导体的绞缆结构,开展了不同扭距序列对耦合损耗作用的探索。研究分析显示:扭距长度不是决定多级绞缆CICC导体耦合损耗数量大小的唯一因素;当导体中各级绞缆的扭距序列比接近1时,耦合损耗会极大减小。测试数据与数值模拟结果对比分析表明:通过合理选择扭距序列比可以优化计算CICC导体的耦合损耗。
The ITER under construction and the cable-in-conduit conductor (CICC) on the fusion reactor in the country will run in a high-current complex field with fast excitation, which makes the central spiral The CICC conductor on the central solenoid (CS) is impacted by a ~ 12 T magnetic field. Therefore, the existing CICC has adopted niobium tin (Nb3Sn) conductor. The strain sensitivity of Nb3Sn conductor not only leads to the degradation of the critical performance of the cable, but also has a great influence on the coupling loss due to the twisted pair sequence at various levels in the conductor. For this reason, we have explored the effect of different torque sequences on the coupling loss for the twisted pair structure of various conductors proposed by ITER project. Research and analysis show that the length of torque is not the only factor that determines the coupling loss of CICC conductors in multilevel cables. The coupling loss will decrease greatly when the torque sequence of all levels of conductors in a conductor approaches 1. The comparative analysis of the test data and the numerical simulation results shows that the coupling loss of CICC conductors can be optimized by reasonably selecting the torque sequence ratio.