Nb_(3)Sn六极复合超导磁体测试全过程的实时分布式应变检测:从组装到励磁  

Distributed real-time strain monitoring for Nb_(3)Sn sextupole superconducting magnets:from assembly to excitation

作　　者：王省哲 杨韬略 关明智 辛灿杰 吴北民 吴魏 孙良亭 赵红卫 周又和 Xingzhe Wang;Taolue Yang;Mingzhi Guan;Canje Xin;Beimin Wu;Wei Wu;Liangting Sun;Hongwei Zhao;Youhe Zhou(Key Laboratory of Mechanics on Western Disaster and Environment,Ministry of Education,College of Civil Engineering and Mechanics,Lanzhou University,Lanzhou,730000,China;China Southern Power Grid Technology Co.,Ltd.,Guangzhou,510080,China;Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou,730000,China;Advanced Energy science and technology Guangdong Laboratory,Huizhou,516000,China)

机构地区：[1]Key Laboratory of Mechanics on Western Disaster and Environment,Ministry of Education,College of Civil Engineering and Mechanics,Lanzhou University,Lanzhou,730000,China [2]China Southern Power Grid Technology Co.,Ltd.,Guangzhou,510080,China [3]Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou,730000,China [4]Advanced Energy science and technology Guangdong Laboratory,Huizhou,516000,China

出　　处：《Acta Mechanica Sinica》2024年第4期78-88,共11页力学学报（英文版）

基　　金：the National Natural Science Foundation of China(Grant Nos.11932008 and 12172357);the Key Projects of Guangdong Basic and Applied Basic Research Fund Joint Fund(Grant No.2022B1515120051);the Key Projects of Natural Science Fund of Gansu Province(Grant No.22JR5RA127);the Fundamental Research Funds for the Central Universities(Grant No.lzujbky-2022-kb06);Gansu Science and Technology Program.

摘　　要：六极Nb_(3)Sn超导磁体系统是第四代电子回旋共振离子源(FECR)中的核心部件.这些超导磁体处于高磁场、超低温以及高应力的极端运行环境,由此关联的磁体应力/应变特征和行为的精确表征对于确保系统可靠性和最优功能实现极具重要意义.传统的单点应变测量技术仅能实现局部小区域的测量,并且存在显著的电磁干扰等,这些局限性严重影响了测量精度和可靠性,使得大型复杂超导磁体极端多场下的力学测量面临着诸多挑战.本文建立了低温极端多场下的光纤测量新技术,可实现六极复合超导磁体的实时、分布式应变测量.该测量系统基于光频域反射技术(OFDR)和高空间分辨率分布式光纤技术,首次实现了超导磁体系统的组装、冷却、励磁及失超全过程中应变状态的实时监测.相关结果有效揭示了超导磁体在整个运行过程中的全局应变特性,如磁体内部全局应变状态的非对称分布现象等.本文研究对于超导磁体研制中的实时和全局力学性能监测和评估提供了有效途径.In pursuit of a fourth-generation electron cyclotron resonance(ECR)source,a powerful Nb_(3)Sn superconducting magnet system employing a sextupole-in-solenoid configuration has been recently developed at the Institute of Modern Physics(IMP)in Lanzhou,China.These superconducting magnets operate under extreme conditions,experiencing high magnetic fields,cryogenic temperatures,and mechanical stresses.Understanding their stress/strain behaviors,therefore,is of utmost importance to ensure reliable operation and optimal performance.However,the conventional single-point strain gauges commonly exhibit certain limitations that pose challenges in measuring global strain within complex and larger structures.The presence of substantial electromagnetic interference further exacerbates the difficulty in obtaining accurate strain measurements.To address these challenges,a novel approach was undertaken in this study to develop a distributed real-time strain monitoring system specifically designed for the sextupole superconducting magnets,which is based on optical frequency domain reflectometry(OFDR)combined with high spatial resolution distributed optical fiber technology.The strain profile and evolution of the magnets system have been comprehensively monitored throughout the entire operational process,including assembly,cooling down,excitation,and quenching stages.Consequently,valuable insights into the global strain characteristics of the superconducting magnets have been attained,revealing intriguing features such as asymmetrical distribution and extreme values.The development of this distributed real-time strain monitoring system represents a notable advancement in the field of superconducting magnet technology.

关 键 词：超导磁体 励磁 应变状态 失超 力学测量 分布式光纤 电磁干扰 应变特性 

分 类 号：TM26[一般工业技术—材料科学与工程]