Mechanical and Electrical Properties of an CFETR CSMC Conductor under Transverse Mechanical Loadings
Mechanical and Electrical Properties of an CFETR CSMC Conductor under Transverse Mechanical Loadings
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横向机械载荷下 CFETR CSMC 导体的机械和电气性能
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
Fang Liu
中科院分区：
文献类型：
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作者：
Yi Shi;Fang Liu
中国聚变工程试验堆（CFETR）的中央螺线管模型线圈（CSMC）项目于2014年启动，旨在验证中国科学院等离子体与物理研究所（ASIPP）大型超导磁体的技术可行性。CSMC Nb3Sn电缆导管导体（CICC）选择CEA推荐的短捻距（STP）设计。为了更好地了解电磁（EM）负载循环的影响，相关的传输性能和耦合损耗的演变，机械和电气性能进行了测量和研究，采用一个特殊的低温压力设备的横向机械负载。结果表明，横向压缩（dy）与施加的载荷力（Fy）是不同的，从第一个到随后的加载循环。这种机械行为可以通过交叉点之间的股线弯曲和交叉点处的股线变形的组合来解释。还给出了dy与Fy的拟合关系。讨论了成缆过程中股间接触电阻（Rc）随循环历史和压力的变化规律。此外，基于股线的微观滑动和铜基体电阻率的组合，提出了Rc与Fy的拟合关系。花瓣内电阻Rc和耦合损耗之间也有明显的相关性。
The Central Solenoid Model Coil (CSMC) project of the China Fusion Engineering Test Reactor (CFETR) was launched in 2014 to verify the technological feasibility of a large-scale superconducting magnet at the Institute of Plasma and Physics Chinese Academy of Sciences (ASIPP). The short twist pitch (STP) design recommended by CEA is chosen for the CSMC Nb3Sn cable-in-conduit conductors (CICC). In order to better understand the evolution of transport properties and coupling losses related to the effect of electromagnetic (EM) load cycles, the mechanical and electrical properties were measured and investigated employing a special cryogenic press facility for the transverse mechanical loadings. The results show that the transverse compression (dy) versus applied load force (Fy) is different from first to subsequent loading cycles. This mechanical behavior can be interpreted by the combination of strands bending between the crossovers and strands deformation at the crossovers. The fitting relations of dy versus Fy are also presented. The evolution of inter-strand contact resistance (Rc) in the cabling stages with cyclic history and pressure effects are discussed. In addition, a fitting relation of Rc versus Fy is presented based on a combination of strand’s micro-sliding and copper matrix resistivity. A clear correlation between intra-petal resistance Rc and coupling loss is also found.