The superconducting Central Solenoid (CS) of the EU-DEMO tokamak coil will comprise five modules, labeled CSU3, CSU2, CS1, CSL2 and CSL3, situated vertically one above the other. The central CS1 module will be operated under the most severe conditions, i.e. the largest mechanical loads and magnetic field. Two alternative designs of the CS1 module are being developed by the CEA and EPFL-SPC teams. The CS1 module designed by CEA is double-pancake wound using a Nb₃Sn Wind&React Cable-in-Conduit Conductor with a central cooling channel. Our work presents the thermal-hydraulic study of the CEA design of the CS1 module based on the EU-DEMO 2018 baseline. The first part of our analysis includes simulations of the CS1 behavior at normal operating conditions, aimed at the estimation of the minimum temperature margin. This part consists of two stages, namely: (i) simulations of the whole simplified “4 points” CS current scenario (not including the breakdown), and (ii) preliminary simulations of the breakdown phase. The second part is focused on quench simulations aimed at the assessment of the maximum hot-spot temperature. The analysis is performed using the THEA code by CryoSoft. We consider the realistic magnetic field and strain profiles along the conductor, heat transfer between neighboring turns and heat loads due to the AC coupling losses. Power of AC coupling losses in all performed simulations is computed based on the effective values of magnetic field and three trial values of the parameter nτ (100 ms, 200 ms and 400 ms). We assume that quench is initiated at the beginning of pre-magnetization phase and we take into account heat generation due to AC losses during the current dump. Minimum temperature margin during the whole simplified current scenario is larger than the 1.5 K acceptance criterion for all considered nτ values. Preliminary simulations of the breakdown phase indicate that the minimum ΔT_marg may drop below 1.5 K, even for the lowest considered nτ value, which calls for attention and requires further more detailed studies. The calculated hot-spot temperatures in all considered cases were safely below the 150 K acceptable limit.

EU-DEMO托卡马克线圈的超导中央螺线管（CS）将包括五个模块，分别标记为CSU3，CSU2，CS1，CSL2和CSL3，它们垂直彼此叠置。中央CS1模块将在最恶劣的条件下运行，即最大的机械负载和磁场。CEA和EPFL-SPC团队正在开发CS1模块的两种替代设计。CEA设计的CS1模块是使用Nb ₃双层煎饼缠绕的带有中央冷却通道的Sn Wind＆React电缆导管。我们的工作提出了基于EU-DEMO 2018基准的CS1模块CEA设计的热工液压研究。我们的分析的第一部分包括模拟CS1在正常工作条件下的行为，旨在估算最小温度裕度。此部分包括两个阶段，即：（i）整个简化的“ 4分” CS当前场景的模拟（不包括故障），以及（ii）故障阶段的初步模拟。第二部分着重于淬火模拟，旨在评估最高热点温度。使用CryoSoft的THEA代码执行分析。我们考虑导体上的实际磁场和应变曲线，由于交流耦合损耗，相邻匝之间的热传递和热负荷。根据磁场的有效值和该参数的三个试验值，计算出所有执行的模拟中交流耦合损耗的功率nτ（100毫秒，200毫秒和400毫秒）。我们假设淬火是在预磁化阶段开始时开始的，并且考虑了由于电流倾卸期间交流损耗而产生的热量。对于所有考虑的nτ值，在整个简化的当前情况下的最小温度裕度都大于1.5 K的接受标准。击穿阶段的初步模拟表明，即使对于最低的nτ值，最小ΔT _marg可能会降至1.5 K以下，这需要引起注意并需要进行更详细的研究。在所有考虑的情况下，计算出的热点温度均安全地低于150 K可接受的极限。