Abstract The new Nb3Sn superconducting magnet system for the fourth-generation 45 GHz ECR source is under development at the Institute of Modern Physics (IMP). A mirror structure of the Nb3Sn sextupole testing coil based on an aluminum shell-based structure and bladder & key technology is used for studying the coil's mechanical, thermal and quench performance under realistic conditions. This paper describes the mechanical analyses performed to estimate the sextupole’s preload. Based on the three-dimensional finite-element mechanical model, the stress analysis for the process of assembly, cooling down, and charging is carried out. The assembly and strain measurement results of sextupole mirror structure are also introduced in this paper.

中文翻译：

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用于测试45 GHz ECRIS Nb3Sn六极线圈的磁镜结构的机械设计

摘要 现代物理研究所 (IMP) 正在开发用于第四代 45 GHz ECR 源的新型 Nb3Sn 超导磁体系统。Nb3Sn六极测试线圈的镜面结构基于铝壳结构和气囊和关键技术，用于研究线圈在现实条件下的机械、热和淬火性能。本文描述了用于估计六极杆预载的力学分析。基于三维有限元力学模型，对装配、冷却和充电过程进行应力分析。本文还介绍了六极镜结构的组装和应变测量结果。