ITER超导纵场线圈内馈线系统冷却过程分析

国际热核聚变实验堆（ITER）超导纵场线圈内馈线系统位于主机杜瓦内，由18个盒体分别悬挂于相应纵场磁体终端，通过连接件组成多边形环。在装置降温过程中，内馈线与磁体冷却收缩的不同步导致相邻盒体环向端面发生相对位移，这要求连接件具有位移补偿功能。通过对内馈线收缩过程的研究，采用有限元分析法对内馈线稳态及瞬态温度场进行数值模拟，得到内馈线的热负荷值、温度及热应力分布、温度及变形的时间历程曲线，结果证明，内馈线无需主动冷却且热负荷小，热应力对结构强度影响小。研究结果同时为具有补偿功能连接件的设计提供了初步参数。

Analysis on Cooling Process of ITER Toroidal Field In-cryostat Feeder System

The ITER toroidal field (TF) in cryostat feeder system (ICF) locates in the main cryostat of the Tokamak. It consists of 18 segments, which form a ring by connectors and hang on the corresponding TF coil terminal area. During cooling down the components in the cryostat, the shrinkage of ICF is not synchronous with the TF coil. In this case, relative displacement occurs on the circumferential end surfaces of the neighbor segments, so that the function of displacement compensation is required on the connector. Researching on cooling process of the ITER TF ICF system, finite element method (FEM) was applied on the numerical simulation of the steady-state and transient temperature field in the ICF. The heat load and temperature distributions in ICF were worked out; furthermore, the temperature-time curve and deformation-time curve were also presented. The results show that active cooling is not required on ICF, the heat load and thermal stress is very weak. Meanwhile, the results will provide primary parameters for the design of connector with compensation function.