电磁热耦合应变下铌三锡导体设计

Design of NbSn conductor under electromagnet and thermal coupling strain

为解决电磁热耦合应变作用导致的工程上Nb3Sn基CICC(Cable-in-Conduit Conductor)导体设计中存在的复杂性问题,研究和构建了综合应变作用效果计算模型,形成关于股线根数和股线直径的导体结构模拟设计方法;考虑电磁载荷周期对接触电阻和空隙率量化作用,以及它对CICC导体AC损耗和稳定运行的影响,基于子缆根数的结构稳定性和AC损耗最小化约束要求,建立包含多变量的导体设计数学规划方法,获得导体结构优化设计模型,通过计算分析得到符合工程要求相对合理的导体结构。并将设计获得的CICC导体,与CFETR(China Fusion Engineering Testing Reactor)工程设计进行了比较和分析,结果显示二者吻合较好。

In order to solve the complexity problem for the design of Nb3Sn-based CICC(Cable-in-Conduit Conductor) caused by the electromagnet and thermal coupling strain, a calculation model of comprehensive strain effect was studied and constructed in the paper, and a structure simulation design method of conductor with the number and diameter of strands was formed.Considering the quantitative effect of electromagnetic load period on the contact resistance and the void fraction, and its influence on AC loss and stable operation for CICC, based on the structural stability characteristics of the sub-cables number and the constraint requirement of minimizing AC loss, a mathematical programming method for conductor design with multiple variables was established, an optimization design model of conductor structure was obtained.Moreover, a relatively reasonable conductor structure which can meet the engineering requirements was obtained by the calculation and analysis.The optimized structure and related performance agree well with the engineering design values used to the CFETR(China Fusion Engineering Testing Reactor) project for being built domestically in the next step.