【摘要】 在国际热核试验反应堆(ITER)上,已采用铌三锡(Nb3Sn)复合股线来满足导体遭受12 T以上的磁场冲击,但Nb3Sn运行时的洛伦兹力会导致临界电流和耦合损耗时间常数的变化,因此Nb3Sn基CICC(cable-in-conduitconductor)性能退化研究还有待加强,而且应变下接触特性对耦合损耗时间常数的影响也仍在探索中。为了快速精确计算耦合损耗,本文提出新的最小二乘法计算耦合损耗时间常数的方法,它采用电缆序列比、电磁载荷应变作用下的接触电阻和空隙率等参数的线性关系来表示。在该模型中,不仅给出绞缆序列比的计算表达,也给出电磁载荷周期应变下接触电阻和空隙率的经验计算方法。与Gandalf及传统的数值计算相比,本文采用电缆序列比、接触电阻和空隙率组合计算耦合损耗误差较小,非常接近工程测试值。更多还原

【Abstract】 On international thermal nuclear experimental reactor（ITER）superconducting fusion device,Nb₃Sn composite strands have been applied to CICC（cable-in-conduit conductor）to undergo the impact of the magnet field above 12 T.The strain of Nb₃Sn-based conductor due to Lorentz forces leads to changes in critical current and coupling loss time constant.Therefore the study on the critical performance degradation of CICC is still inadequate,and the influence of the contact properties with strain on the coupling loss time constant is also insufficient.In order to calculate the coupling loss accurately and quickly,a new calculation model of coupling loss time constant was put forward in this paper.The model is expressed by a linear equation using some parameters such as the cabling sequence ratio,contact resistance and void fraction with strain main from electromagnetic force.In this model,the computation expression of cabling sequence ratio,as well as the contact resistance and the void fraction are obtained under the strain from cyclic electromagnetic load.Compared with numerical calculation using Gandalf and the traditional method,coupling loss calculated by the new model has a small error,and it is close to the engineering measurement.更多还原