摘要
为探索传导冷却超导磁体在动态运行时的核心物理机制,本研究构建了1.5 T NbTi传导冷磁体降温与通流的电磁-热耦合模型,并开展实验验证。研究表明,模型在纯降温工况下较为准确地预测了一级冷头(29.52 K/31.92 K)和磁体表面(5.48 K/4.82 K)的稳态温度,同时在通流工况下成功解释了实验观测现象:一级冷头温度不升反降(29.34 K/29.03 K),而二级冷头温度显著上升(4.54 K/3.62 K),表明系统内部存在由焦耳热驱动的热流重构机制,即二级回路温度上升改变了系统温差分布,反向调节了一级回路的热负荷。研究结果为进一步探索极低温、大电流极端条件下的超导磁体能量输运过程提供了有力支撑。
To explore the core physical mechanisms of conduction-cooled superconducting magnets during dynamic operation,this study established an electromagnetic-thermal coupled model of a 1.5 T NbTi conduction-cooled magnet for both cooldown and current-ramping processes,and validated it experimentally.The model accurately predicted the steady-state temperatures of the first-stage cold head(29.52 K/31.95 K)and the magnet surface(5.48 K/4.82 K)under cooldown conditions.Under current loading,it also reproduces the experimentally observed behavior:the first stage cold head temperature decreases instead of increasing(29.34 K/29.03 K),while the second stage cold head temperature rises significantly(4.54 K/3.62 K).This indicates aJoule-heat-driven reconstruction of thermal flux,in which the temperature rise in the second stage alters the system's temperature gradient and inversely regulates the first-stage heat load.The findings provide strong support for further studies of energy transport in superconducting magnets under extreme conditions of ultra-low temperature and high current.
作者
丁静仪
代天立
张俊飞
霍绍新
闫朝辉
周超
Ding Jingyi;Dai Tianli;Zhang Junfei;Huo Shaoxin;Yan Zhaohui;Zhou Chao(Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China;University of Science and Technology of China,Hefei 230026,China;School of Electrical and Information Engineering,Anhui University of Science and Tecnology,Huainan 232001,China;Institute of Energy,Hefei Comprehensive National Science Center,Hefei 230031,China)
出处
《低温与超导》
北大核心
2025年第11期11-18,72,共9页
Cryogenics and Superconductivity
基金
国家重点研发计划(2024YFE03110003)
中国科学院等离子体所基金项目(DSJJ-2023-03)资助。
关键词
传导冷却
超导磁体
电磁热耦合
有限元仿真
Conduction-cooled
Superconductive magnet
Electromagnetic-thermal coupling
Finite element simulation
