AC loss test and analysis of the prototype CIC conductor joint for CFETR CSMC
AC loss test and analysis of the prototype CIC conductor joint for CFETR CSMC
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DOI：
10.1016/j.fusengdes.2018.12.035
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发表时间：
2019-02
影响因子：
1.7
通讯作者：
Yi Shi;Guang-hui Ma;Q. Hao;Yong-Zhao Zhang;Min Yu;Fang Liu;Hua-jun Liu;J. Qin;Yuehua Wu
中科院分区：
文献类型：
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作者：
Yi Shi;Guang-hui Ma;Q. Hao;Yong-Zhao Zhang;Min Yu;Fang Liu;Hua-jun Liu;J. Qin;Yuehua Wu
中国科学院等离子体与物理研究所（ASIPP）启动了中国聚变工程试验堆（CFETR）中心螺线管模型线圈（CSMC）项目。电接头是CSMC的重要方面，因为电阻损耗引起的局部加热会使超导体进入不稳定状态并导致过早失超。因此，该项目的一部分是开发低直流电阻和交流损耗的接头。本文对CSMC初步测试场景中全尺寸原型导体接头的交流损耗功率和局部发热进行了实验和数值评估。在苏丹装置上，利用外加的谐波场和较宽的频率范围测量了接头样品的交流损耗。在实验的基础上，采用多带部分屏蔽（MPAS）模型对接头的交流损耗进行了表征。然后，在测试场景中计算接头的交流损耗功率。由于模拟的交流损耗在测试场景中的接头的温升进行了数值研究。仿真结果表明，接头处的温升相对较高，不仅对接头处的稳定性有较大影响，而且对线圈的稳定性也有较大影响。因此，需要优化CSMC的连接结构和测试方案，以降低交流损耗，确保安全运行。文中还讨论了减少接头交流损耗存款的途径。
The Central Solenoid Model Coil (CSMC) project has been launched at the Institute of Plasma and Physics Chinese Academy of Sciences (ASIPP) for China Fusion Engineering Test Reactor (CFETR). Electrical joints are important aspect for CSMC, because the local heating from resistive losses can drive the superconductor into a less stable regime and result in premature quench. So part of the project is to develop joints with low DC resistance and AC loss. AC loss power and local heating of the full-size prototype conductor joint in the preliminary test scenario of CSMC are evaluated experimentally and numerically in this paper. The AC loss of the joint sample is measured in SULTAN facility with an applied harmonic field and wider frequency range. Based on the experimental results, the AC loss of the joint is characterized by Multizones Partial Shielding (MPAS) model. Then, the AC loss power of the joint is calculated in the test scenario. The temperature rise of joint is investigated numerically due to the simulated AC loss in the test scenario. The simulation results show the temperature rise in the joint is relatively higher which affects the stability greatly not only in joints, but also the coils. So the joint structure and test scenario of CSMC need to be optimized to reduce the AC loss and ensure safe operation. The way to reduce the AC loss deposit in the joint is also discussed.