Abstract The JT-60SA cryogenic system was commissioned in 2016 in closed loop, without the cryogenic users (superconducting magnets, current leads, thermal shields). The first plasma operation is expected in 2020. This paper updates the heat load profiles resulting from the cooling loop of TF magnets, and received by the refrigerator and its thermal damper. The heat load profiles are calculated through thermal-hydraulic simulations of the magnets and the associated cryo-distribution, also named as supercritical helium loops. This update was performed by taking into account new data from the TF magnets (measured pressure drops, updated heat loads coming from the plasma), as well as a more accurate thermal model of the TF magnet. Previous simulation had been performed using the Vincenta code in 2010 and were used for the cryogenic system acceptance tests. The new thermal-hydraulic model is performed by using Simcryogenics, the modeling tool dedicated to refrigeration and cryo-distribution developed by CEA (Commissariat a l’energie atomique et aux energies alternatives). The differences between the two simulation results are highlighted and analyzed. These simulations provide the pulsed heat load profiles smoothed by the cryo-distribution and deposited into the thermal damper.

中文翻译：

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用于准备等离子体操作的 JT-60SA 环形磁场线圈冷却回路的动态热工水力模拟更新

摘要 JT-60SA 低温系统于 2016 年在闭环中投入使用，没有低温用户（超导磁铁、电流引线、热屏蔽）。预计 2020 年将进行第一次等离子操作。本文更新了由 TF 磁体的冷却回路产生并由冰箱及其热阻尼器接收的热负荷曲线。热负荷分布是通过磁体的热工水力模拟和相关的低温分布计算的，也称为超临界氦回路。此更新是通过考虑来自 TF 磁体的新数据（测量的压降、来自等离子体的更新热负荷）以及更准确的 TF 磁体热模型来执行的。之前的模拟是在 2010 年使用 Vincenta 代码进行的，并用于低温系统验收测试。新的热工水力模型是通过使用 Simcryogenics 来执行的，Simcryogenics 是由 CEA（Commissariat a l'energie atomique et aux energyalterns）开发的专门用于制冷和低温分布的建模工具。突出显示并分析了两个模拟结果之间的差异。这些模拟提供了通过低温分布平滑并沉积到热阻尼器中的脉冲热负载曲线。突出显示并分析了两个模拟结果之间的差异。这些模拟提供了通过低温分布平滑并沉积到热阻尼器中的脉冲热负载曲线。突出显示并分析了两个模拟结果之间的差异。这些模拟提供了通过低温分布平滑并沉积到热阻尼器中的脉冲热负载曲线。