Investigation of real-time strain responses of the insulating system of superconducting magnets by using fiber Bragg grating sensors

被引：1

作者：

Zhao, Wanyin ^{[1
,2
,3
]}

Xin, Jijun ^{[3
]}

Zhang, Hengcheng ^{[1
]}

Wang, Wei ^{[3
]}

Fang, Zhichun ^{[3
]}

Lyu, Bingkun ^{[3
]}

Wu, Longfeng ^{[3
]}

Wang, Chundong ^{[1
,2
,3
]}

Shen, Fuzhi ^{[1
]}

Shan, Xinran ^{[1
]}

Huang, Chuanjun ^{[1
]}

Sun, Wentao ^{[1
]}

Zhou, Yuan ^{[1
]}

Li, Laifeng ^{[1
,2
,3
]}

机构：

[1] Chinese Acad Sci, Tech Inst Phys & Chem, Key Lab Cryogen, Beijing 100190, Peoples R China

[2] Univ Chinese Acad Sci, Sch Future Technol, Beijing 100049, Peoples R China

[3] Songshan Lake Mat Lab, Dongguan 523808, Peoples R China

来源：

JOURNAL OF APPLIED PHYSICS | 2023年 / 133卷 / 15期

基金：

中国国家自然科学基金; 国家重点研发计划;

关键词：

MECHANICAL DISTURBANCES; COILS;

D O I：

10.1063/5.0139891

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The normal operation of various superconducting magnets is greatly influenced by the thermal stress of the insulating system, commonly made of epoxy resins with vacuum pressure impregnation (VPI) technology, throughout the curing and cooling processes. In this work, we developed a Fiber Bragg Grating (FBG) strain measurement method to monitor the real-time strain responses of an epoxy resin IR-3 and its glass fiber-reinforced composite during both curing and cooling processes. Then, we also monitored the same process of a Nb-Ti superconducting magnet coil prepared by VPI technology. With the help of FBG strain sensors, the residual strains of the coil at various positions and directions were investigated. The results show that the large residual strain occurred near the end of the coil in the axial direction. In addition, the interlaminar shear stress properties were measured at both room temperature and liquid nitrogen temperature. The strain characteristics of the epoxy resin IR-3 and the insulating system can provide useful guidance for the design and construction of high-field Nb-Ti superconducting magnets.

引用

页数：10