12T/50mm无液氦超导磁体低温系统热分析  

Thermal analysis of cryogenic system for a 12 T/50 mm cryogen-free superconducting magnet

作　　者：罗莹 李俊杰[1,2] 吴向阳[1,2] Luo Ying;Li Junjie;Wu Xiangyang(University of Science and Technology of China,Hefei 230026,China;High Magnetic Field Laboratory,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China)

机构地区：[1]中国科学技术大学,合肥230026 [2]中国科学院合肥物质科学研究院强磁场科学中心,合肥230031

出　　处：《低温工程》2023年第6期82-89,共8页Cryogenics

基　　金：安徽省重点研究与开发计划专项:强磁场下高安全稳定性超导磁体关键技术研究(2022a05020036)。

摘　　要：为了使12T/50 mm无液氦超导磁体在4.5 K低温下具有更好的运行稳定性,针对磁体线圈设计了传导冷却结构及低温系统。通过仿真软件,模拟低温环境下磁体线圈的温度分布,进一步对低温系统内部的导热结构进行优化设计。为了防止线圈在降温过程中产生过大温差导致热应力集中,根据低温系统在不同工况下的热负荷变化,对各部件降温过程进行瞬态模拟。模拟结果表明,12 T/50 mm无液氦超导磁体低温系统能够满足磁体线圈所需要的低温环境,即磁体线圈正常运行温度低于4.5 K,励磁温度低于6 K,降温及励磁过程中产生的最大温差低于20 K。In order to achieve good cryogenic stability of 12 T/50 mm cryogen-free superconducting magnets at a low temperature of 4.5 K,a cryogenic system using thermal conductive structure were designed for the superconducting coils.Temperature distribution of the superconducting coils under low temperature was simulated,and then the conductive structures between cold heads and thermal loads were optimized.To prevent concentration of thermal stresses caused by large temperature differences,transient simulations of the cool-down of each component were performed according to the thermal load changes under different working conditions.The simulation results show that the cryogenic system is able to meet the required low-temperature environment of the superconducting coils.The maximal temperature of the coils in normal and charging operation are lower than 4.5 K and 6 K separately,and the maximal temperature difference during all the processes are lower than 20 K.

关 键 词：低温系统 无液氦 热分析 超导线圈 

分 类 号：TB611[一般工业技术—制冷工程]