Abstract The equatorial plane of the inner leg of a toroidal field (TF) coil is the most stressed part of the TF coil system and optimal usage of the radial space in this region is crucial for the design of the DEMO tokamak reactor. A procedure for initial dimensioning (pre-dimensioning) of this region developed earlier [ 1 ] is based on a simplified 2D geometry of the TF coil cross-section and a semi-analytical approach to estimate stresses in the TF coil case and the conductor jackets with limited capabilities for optimization. This work presents a new procedure named TFC-PREDIM which features a detailed 2D finite element (FE) generalized plane strain model. The model gives very accurate results within a short calculation time and allows additional options for layout optimization. The FE model for the cross-section is generated automatically from the input geometrical parameters of the given layout allowing any of the conductor design options currently investigated for DEMO. The post-processing of the results is also automated, consisting in the determination of the maximum values of the membrane and membrane + bending Tresca stresses for each conductor jacket and for the TF coil case. Two strategies for the optimization of the cross-section are presented: minimization of the TF coil radial build with a predefined maximal toroidal field and maximization of the maximal toroidal field for a predefined radial space.

中文翻译：

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TFC-PREDIM：DEMO 托卡马克反应堆 TF 线圈系统的 FE 尺寸确定程序

摘要 环形场 (TF) 线圈内腿的赤道面是 TF 线圈系统中受力最大的部分，该区域径向空间的最佳利用对于 DEMO 托卡马克反应堆的设计至关重要。早期开发的该区域的初始尺寸（预尺寸）程序 [1] 基于 TF 线圈横截面的简化 2D 几何形状和半解析方法来估计 TF 线圈外壳和导体护套中的应力优化能力有限。这项工作提出了一种名为 TFC-PREDIM 的新程序，它具有详细的二维有限元 (FE) 广义平面应变模型。该模型在很短的计算时间内给出非常准确的结果，并允许布局优化的附加选项。横截面的 FE 模型是根据给定布局的输入几何参数自动生成的，允许当前为 DEMO 研究的任何导体设计选项。结果的后处理也是自动化的，包括确定每个导体护套和 TF 线圈外壳的膜和膜 + 弯曲 Tresca 应力的最大值。提出了两种优化横截面的策略：使用预定义的最大环形场最小化 TF 线圈径向构建和最大化预定义径向空间的最大环形场。包括确定每个导体护套和 TF 线圈外壳的膜和膜 + 弯曲 Tresca 应力的最大值。提出了两种优化横截面的策略：使用预定义的最大环形场最小化 TF 线圈径向构建和最大化预定义径向空间的最大环形场。包括确定每个导体护套和 TF 线圈外壳的膜和膜 + 弯曲 Tresca 应力的最大值。提出了两种优化横截面的策略：使用预定义的最大环形场最小化 TF 线圈径向构建和最大化预定义径向空间的最大环形场。