Effect of SHe Temperature on Cool-Down Speed in JT-60SA CS Module
Effect of SHe Temperature on Cool-Down Speed in JT-60SA CS Module
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JT-60SA CS 模块中 SHe 温度对冷却速度的影响
DOI：
10.1109/tasc.2021.3062791
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发表时间：
2021
影响因子：
1.8
通讯作者：
Hamada Kazuya
中科院分区：
文献类型：
--
作者：
Sonoda Shogo;Nakamura Kazuya;Hirose Yuta;Natsume Kyohei;Fukui Kazuma;Murakami Haruyuki;Kizu Kaname;Hamada Kazuya
JT-60 SA中心螺线管（CS）由四个堆叠模块组成，由超临界氦（SHe）冷却至4.5 K的工作温度。在从室温冷却到4.5K的过程中，为了避免线圈损坏，需要减小由于线圈中的温差引起的热应力。在冷却操作中，CS需要将导管中电缆（CIC）导体的纵向方向上的最大温差控制在40 K以下。然而，由于这可能会损坏线圈，因此正确估计导体中的温度分布对于确保安全执行冷却操作非常重要。在本研究中，JT-60 SA CS模块的准备和入口和出口温度，以及SHe的质量流率，进行测量，直到CS模块冷却到工作温度，之后进行CS模块模拟，以确定入口温度对冷却速度的影响。根据模拟结果，得出的结论是，平均冷却速度为0.73 K/h，CS模块在大约8.3天内达到80 K，同时将最大温差保持在40 K以内。此外，入口和出口之间的温差保持在25 K以内，以限制热应力。总之，我们的分析结果提供了基本数据，可用于评估线圈的安全冷却操作，从而保护线圈系统。
The JT-60SA central solenoid (CS), which consists of four stacked modules, is cooled to an operating temperature of 4.5 K by supercritical helium (SHe). During cool-down from room temperature to 4.5 K, in order to avoid a damage on the coil, it is required to reduce thermal stress due to temperature difference in the coil. In the cool-down operation, the CS needs to control the maximum temperature difference in the longitudinal direction of the cable-in-conduit (CIC) conductor below 40 K. However, since that could damage the coil, correctly estimating the temperature distribution in the conductor is important for ensuring the cool-down operation is performed safely. In the present study, the JT-60SA CS module was prepared and the inlet and outlet temperatures, as well as the SHe mass flow rate, were measured until the CS module was cooled to operating temperature, after which a CS module simulation was performed in order to determine the effect of the inlet temperature on the cool-down speed. From the simulation results, it was concluded that the average cool-down speed was 0.73 K/h and the CS module reached 80 K in approximately 8.3 days while maintaining the maximum temperature difference within 40 K. Furthermore, the temperature difference between the inlet and outlet was kept within 25 K in order to limit the thermal stress. Taken together, the results of our analyses provide fundamental data that can be used to evaluate the safe cool-down operation of the coil and thus protect the coil systems.
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